diff --git a/.env.example b/.env.example
index b220868..1d18f27 100644
--- a/.env.example
+++ b/.env.example
@@ -25,6 +25,13 @@ MAM_API_URL=http://mam-api:3000
 # Auth — default to ON in production. Setting to 'false' is a dev-only escape
 # hatch that disables all auth checks and attaches a synthetic 'dev' user to
 # every request. Never run with AUTH_ENABLED=false on a network you don't control.
+#
+# RBAC v2 note: with AUTH_ENABLED=true, per-project access is enforced. Service
+# API tokens (capture sidecar, Premiere panel, integrations) must belong to a
+# user with the access they need — an 'admin' user (full access), or a user with
+# the right project grants. A non-admin service token with no grants will get
+# 403 on asset registration (ingest) and streaming. In dev mode the synthetic
+# user is admin, so this only matters once auth is on.
 AUTH_ENABLED=true
 
 # CORS allowlist — comma-separated origins that may carry credentials to the API.
diff --git a/services/mam-api/src/auth/authz.js b/services/mam-api/src/auth/authz.js
new file mode 100644
index 0000000..22a37a6
--- /dev/null
+++ b/services/mam-api/src/auth/authz.js
@@ -0,0 +1,90 @@
+// Per-project authorization — the single source of truth for "can this user
+// touch this project?". v1 auth answers "are you logged in?"; this answers
+// "which projects, and at what level?".
+//
+// Model (locked with Zac):
+//   - role 'admin'            → global bypass; every project at 'edit'.
+//   - role 'editor'/'viewer'  → scoped to projects granted to them directly
+//                               (project_access subject_type='user') or via a
+//                               group they belong to (subject_type='group').
+//   - grant level 'view'      → read-only; 'edit' → read-write.
+//
+// A user's effective level on a project is the MAX of every matching grant
+// (direct + each group). 'edit' outranks 'view'.
+//
+// All functions take an optional `db` (defaults to the shared pool) so tests
+// can inject an isolated test pool.
+
+import defaultPool from '../db/pool.js';
+
+const LEVEL_RANK = { view: 1, edit: 2 };
+
+export function isAdmin(user) {
+  return user?.role === 'admin';
+}
+
+// Returns the higher of two levels (either may be null/undefined).
+function maxLevel(a, b) {
+  const ra = LEVEL_RANK[a] || 0;
+  const rb = LEVEL_RANK[b] || 0;
+  if (ra === 0 && rb === 0) return null;
+  return ra >= rb ? a : b;
+}
+
+// Resolve every project the user can see, with their effective level.
+//   admin → { all: true, ids: null, levelByProject: null }
+//   else  → { all: false, ids: Set<projectId>, levelByProject: Map<projectId, 'view'|'edit'> }
+export async function accessibleProjectIds(user, db = defaultPool) {
+  if (isAdmin(user)) return { all: true, ids: null, levelByProject: null };
+
+  const levelByProject = new Map();
+  if (!user?.id) return { all: false, ids: new Set(), levelByProject };
+
+  const { rows } = await db.query(
+    `SELECT pa.project_id, pa.level
+       FROM project_access pa
+      WHERE (pa.subject_type = 'user'  AND pa.subject_id = $1)
+         OR (pa.subject_type = 'group' AND pa.subject_id IN (
+              SELECT group_id FROM user_groups WHERE user_id = $1
+            ))`,
+    [user.id]
+  );
+
+  for (const r of rows) {
+    levelByProject.set(r.project_id, maxLevel(levelByProject.get(r.project_id), r.level));
+  }
+  return { all: false, ids: new Set(levelByProject.keys()), levelByProject };
+}
+
+// Effective level on a single project: 'edit' | 'view' | null.
+export async function projectLevel(user, projectId, db = defaultPool) {
+  if (isAdmin(user)) return 'edit';
+  if (!user?.id || !projectId) return null;
+
+  const { rows } = await db.query(
+    `SELECT pa.level
+       FROM project_access pa
+      WHERE pa.project_id = $1
+        AND ( (pa.subject_type = 'user'  AND pa.subject_id = $2)
+           OR (pa.subject_type = 'group' AND pa.subject_id IN (
+                 SELECT group_id FROM user_groups WHERE user_id = $2
+               )) )`,
+    [projectId, user.id]
+  );
+
+  let level = null;
+  for (const r of rows) level = maxLevel(level, r.level);
+  return level;
+}
+
+// Throw a 403-shaped error (caught by errorHandler) unless the user has at
+// least `need` access on the project. `need` ∈ 'view' | 'edit'.
+export async function assertProjectAccess(user, projectId, need = 'view', db = defaultPool) {
+  if (isAdmin(user)) return;
+  const have = await projectLevel(user, projectId, db);
+  if (!have || (LEVEL_RANK[have] || 0) < (LEVEL_RANK[need] || 0)) {
+    const err = new Error('forbidden');
+    err.status = 403;
+    throw err;
+  }
+}
diff --git a/services/mam-api/src/db/migrations/026-project-access.sql b/services/mam-api/src/db/migrations/026-project-access.sql
new file mode 100644
index 0000000..3e49d4b
--- /dev/null
+++ b/services/mam-api/src/db/migrations/026-project-access.sql
@@ -0,0 +1,30 @@
+-- Migration 026 — per-project access grants (RBAC v2).
+--
+-- v1 auth is flat: any logged-in user can do everything. This adds per-project
+-- scoping. A grant targets either a user or a group (polymorphic subject) and
+-- carries a level: 'view' (read-only) or 'edit' (read-write). Admins bypass all
+-- of this in code (authz.js) and need no rows here.
+--
+-- subject_id is intentionally NOT a foreign key — it points at either users.id
+-- or groups.id depending on subject_type. Rows are cleaned up when the project
+-- is deleted (FK cascade). A deleted user/group leaves an orphan row that
+-- resolves to nobody (harmless); a later sweep can prune them if desired.
+
+DO $$ BEGIN
+  IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'access_level') THEN
+    CREATE TYPE access_level AS ENUM ('view', 'edit');
+  END IF;
+END $$;
+
+CREATE TABLE IF NOT EXISTS project_access (
+  project_id   UUID NOT NULL REFERENCES projects ON DELETE CASCADE,
+  subject_type TEXT NOT NULL CHECK (subject_type IN ('user', 'group')),
+  subject_id   UUID NOT NULL,
+  level        access_level NOT NULL DEFAULT 'view',
+  granted_by   UUID REFERENCES users ON DELETE SET NULL,
+  granted_at   TIMESTAMPTZ DEFAULT NOW(),
+  PRIMARY KEY (project_id, subject_type, subject_id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_project_access_subject
+  ON project_access (subject_type, subject_id);
diff --git a/services/mam-api/src/index.js b/services/mam-api/src/index.js
index d7cf83f..27c69d8 100644
--- a/services/mam-api/src/index.js
+++ b/services/mam-api/src/index.js
@@ -8,7 +8,7 @@ import os from 'node:os';
 import { exec } from 'node:child_process';
 import pool from './db/pool.js';
 import { errorHandler } from './middleware/errors.js';
-import { requireAuth, requireUiHeader } from './middleware/auth.js';
+import { requireAuth, requireUiHeader, requireAdmin } from './middleware/auth.js';
 import { loadS3ConfigFromDb } from './s3/client.js';
 
 import authRouter from './routes/auth.js';
@@ -117,8 +117,10 @@ app.use('/api/v1', (req, res, next) => {
 
 // ── API Routes ────────────────────────────────────────────────────────────────
 app.use('/api/v1/auth',    authRouter);
-app.use('/api/v1/auth/users', usersRouter);
-app.use('/api/v1/users', usersRouter);  // alias for the existing SPA Users page that calls /api/v1/users; keeps the same auth gate
+// User and group administration is admin-only (RBAC v2). The auth gate above
+// already established req.user; requireAdmin rejects non-admins with 403.
+app.use('/api/v1/auth/users', requireAdmin, usersRouter);
+app.use('/api/v1/users', requireAdmin, usersRouter);  // alias for the SPA Users page
 app.use('/api/v1/auth/tokens', requireAuth, tokensRouter);
 app.use('/api/v1/assets',    assetsRouter);
 app.use('/api/v1/projects',  projectsRouter);
@@ -129,7 +131,7 @@ app.use('/api/v1/upload',    uploadRouter);
 app.use('/api/v1/recorders', recordersRouter);
 app.use('/api/v1/settings',  settingsRouter);
 app.use('/api/v1/ampp',      amppRouter);
-app.use('/api/v1/groups',    groupsRouter);
+app.use('/api/v1/groups',    requireAdmin, groupsRouter);
 app.use('/api/v1/sequences', sequencesRouter);
 app.use('/api/v1/system',    systemRouter);
 app.use('/api/v1/cluster',   clusterRouter);
diff --git a/services/mam-api/src/middleware/auth.js b/services/mam-api/src/middleware/auth.js
index d835c42..f942ea1 100644
--- a/services/mam-api/src/middleware/auth.js
+++ b/services/mam-api/src/middleware/auth.js
@@ -4,7 +4,9 @@ import { parseBearer, hashToken } from '../auth/tokens.js';
 // Stable UUID matching migration 023's seeded dev user.
 /** UUID of the seeded dev-mode placeholder. NOT a sentinel for "any unauthenticated user". */
 export const DEV_USER_ID = '00000000-0000-4000-8000-000000000000';
-export const DEV_USER    = { id: DEV_USER_ID, username: 'dev', display_name: 'Dev (AUTH_ENABLED=false)' };
+// role 'admin' so dev mode (AUTH_ENABLED=false) keeps full access through the
+// RBAC v2 gates — matches migration 023's seeded dev row.
+export const DEV_USER    = { id: DEV_USER_ID, username: 'dev', display_name: 'Dev (AUTH_ENABLED=false)', role: 'admin' };
 
 const ABSOLUTE_MS = 8 * 3600 * 1000;
 const IDLE_MS     = 1 * 3600 * 1000;
@@ -73,6 +75,14 @@ export async function requireAuth(req, res, next) {
   return res.status(401).json({ error: 'unauthorized' });
 }
 
+// Gate a route to admins only. requireAuth must run first (it sets req.user).
+// 401 when unauthenticated, 403 when authenticated but not an admin.
+export function requireAdmin(req, res, next) {
+  if (!req.user) return res.status(401).json({ error: 'unauthorized' });
+  if (req.user.role !== 'admin') return res.status(403).json({ error: 'forbidden' });
+  return next();
+}
+
 // Belt-and-suspenders CSRF: SameSite=Lax already blocks most cross-site
 // cookie sends, but a custom header that no <form> can produce hardens
 // against the edge cases. Applied to mutating verbs only.
diff --git a/services/mam-api/src/routes/assets.js b/services/mam-api/src/routes/assets.js
index 905ab12..73a5f71 100644
--- a/services/mam-api/src/routes/assets.js
+++ b/services/mam-api/src/routes/assets.js
@@ -7,9 +7,36 @@ import pool from '../db/pool.js';
 import { getSignedUrlForObject, deleteObject, s3Client, getS3Bucket } from '../s3/client.js';
 import { GetObjectCommand, HeadObjectCommand } from '@aws-sdk/client-s3';
 import { validateUuid } from '../middleware/errors.js';
+import { assertProjectAccess, accessibleProjectIds } from '../auth/authz.js';
+import { requireAdmin } from '../middleware/auth.js';
 
 const router = express.Router();
-router.param('id', (req, res, next) => validateUuid('id')(req, res, next));
+
+// Every /:id asset route is scoped to the asset's project. The param handler
+// validates the UUID, resolves the owning project_id, and asserts at least
+// 'view' access (the baseline for touching an asset at all). Mutating routes
+// additionally assert 'edit' via req.assetProjectId. A missing asset is a clean
+// 404 here rather than leaking existence to users without access.
+router.param('id', async (req, res, next) => {
+  validateUuid('id')(req, res, () => {});
+  if (res.headersSent) return;
+  try {
+    const { rows } = await pool.query('SELECT project_id FROM assets WHERE id = $1', [req.params.id]);
+    if (rows.length === 0) return res.status(404).json({ error: 'Asset not found' });
+    req.assetProjectId = rows[0].project_id;
+    await assertProjectAccess(req.user, req.assetProjectId, 'view');
+    next();
+  } catch (err) { next(err); }
+});
+
+// Route-level guard for mutating /:id endpoints — escalates the param handler's
+// 'view' baseline to 'edit'. Reuses req.assetProjectId (already resolved).
+async function requireAssetEdit(req, res, next) {
+  try {
+    await assertProjectAccess(req.user, req.assetProjectId, 'edit');
+    next();
+  } catch (err) { next(err); }
+}
 
 // BullMQ queue connection (mirrors worker/src/index.js)
 const parseRedisUrl = (url) => {
@@ -66,6 +93,15 @@ router.get('/', async (req, res, next) => {
     const params = [];
     let paramCount = 1;
 
+    // Scope to projects the caller can access (admins are unfiltered). Without
+    // this, a granted user would see every asset across every project.
+    const access = await accessibleProjectIds(req.user);
+    if (!access.all) {
+      if (access.ids.size === 0) return res.json({ assets: [], total: 0 });
+      query += ` AND a.project_id = ANY($${paramCount++}::uuid[])`;
+      params.push([...access.ids]);
+    }
+
     // Exclude archived unless explicitly requested — independent of status filter
     if (include_archived !== 'true') {
       query += ` AND a.status <> 'archived'`;
@@ -132,6 +168,9 @@ router.post('/', async (req, res, next) => {
       return res.status(400).json({ error: 'projectId and clipName are required' });
     }
 
+    // Registering an asset writes into a project — require edit access there.
+    await assertProjectAccess(req.user, projectId, 'edit');
+
     const durationNum = duration !== undefined && duration !== null ? Number(duration) : null;
     if (durationNum !== null && !Number.isFinite(durationNum)) {
       return res.status(400).json({ error: 'duration must be a finite number (seconds)' });
@@ -220,8 +259,8 @@ router.post('/', async (req, res, next) => {
   }
 });
 
-// POST /cleanup-live
-router.post('/cleanup-live', async (req, res, next) => {
+// POST /cleanup-live — cross-project maintenance, admin only.
+router.post('/cleanup-live', requireAdmin, async (req, res, next) => {
   try {
     const maxAgeHours = Math.max(1, parseInt(req.query.max_age_hours || '4', 10));
     const result = await pool.query(
@@ -234,8 +273,8 @@ router.post('/cleanup-live', async (req, res, next) => {
   } catch (err) { next(err); }
 });
 
-// POST /cleanup-live-orphans
-router.post('/cleanup-live-orphans', async (_req, res, next) => {
+// POST /cleanup-live-orphans — cross-project maintenance, admin only.
+router.post('/cleanup-live-orphans', requireAdmin, async (_req, res, next) => {
   try {
     const liveRoot = process.env.LIVE_DIR || '/live';
     let entries;
@@ -277,7 +316,7 @@ router.get('/:id', async (req, res, next) => {
 });
 
 // PATCH /:id
-router.patch('/:id', async (req, res, next) => {
+router.patch('/:id', requireAssetEdit, async (req, res, next) => {
   try {
     const { id } = req.params;
     const { display_name, tags, notes, bin_id } = req.body;
@@ -299,7 +338,7 @@ router.patch('/:id', async (req, res, next) => {
 });
 
 // POST /:id/copy
-router.post('/:id/copy', async (req, res, next) => {
+router.post('/:id/copy', requireAssetEdit, async (req, res, next) => {
   try {
     const { id } = req.params;
     const { binId, projectId } = req.body;
@@ -346,7 +385,7 @@ router.post('/:id/copy', async (req, res, next) => {
 });
 
 // POST /:id/mark-empty
-router.post('/:id/mark-empty', async (req, res, next) => {
+router.post('/:id/mark-empty', requireAssetEdit, async (req, res, next) => {
   try {
     const { id } = req.params;
     // Bug #66: first check the asset exists and what status it is in
@@ -384,7 +423,7 @@ router.post('/:id/mark-empty', async (req, res, next) => {
 // the existing live row -> 409 -> asset stuck 'live', no jobs. Finalising by id
 // flips it out of 'live', records duration + S3 keys, and kicks off the
 // proxy -> thumbnail -> filmstrip job chain.
-router.post('/:id/finalize', async (req, res, next) => {
+router.post('/:id/finalize', requireAssetEdit, async (req, res, next) => {
   try {
     const { id } = req.params;
     const { hiresKey, proxyKey, duration } = req.body;
@@ -436,7 +475,7 @@ router.post('/:id/finalize', async (req, res, next) => {
 });
 
 // POST /:id/generate-proxy
-router.post('/:id/generate-proxy', async (req, res, next) => {
+router.post('/:id/generate-proxy', requireAssetEdit, async (req, res, next) => {
   try {
     const { id } = req.params;
     const r = await pool.query('SELECT * FROM assets WHERE id = $1', [id]);
@@ -452,8 +491,8 @@ router.post('/:id/generate-proxy', async (req, res, next) => {
   } catch (err) { next(err); }
 });
 
-// POST /backfill-proxies
-router.post('/backfill-proxies', async (_req, res, next) => {
+// POST /backfill-proxies — cross-project maintenance, admin only.
+router.post('/backfill-proxies', requireAdmin, async (_req, res, next) => {
   try {
     const targets = await pool.query(
       `SELECT id, original_s3_key FROM assets
@@ -477,7 +516,7 @@ router.post('/backfill-proxies', async (_req, res, next) => {
 
 // POST /:id/reprocess?type=proxy|thumbnail|filmstrip
 // Force-requeue a processing job regardless of current asset status.
-router.post('/:id/reprocess', async (req, res, next) => {
+router.post('/:id/reprocess', requireAssetEdit, async (req, res, next) => {
   try {
     const { id } = req.params;
     const type = req.query.type || 'proxy';
@@ -528,7 +567,7 @@ router.get('/:id/filmstrip', async (req, res, next) => {
 });
 
 // POST /:id/retry
-router.post('/:id/retry', async (req, res, next) => {
+router.post('/:id/retry', requireAssetEdit, async (req, res, next) => {
   try {
     const { id } = req.params;
     const r = await pool.query('SELECT * FROM assets WHERE id = $1', [id]);
@@ -547,7 +586,7 @@ router.post('/:id/retry', async (req, res, next) => {
 });
 
 // DELETE /:id
-router.delete('/:id', async (req, res, next) => {
+router.delete('/:id', requireAssetEdit, async (req, res, next) => {
   try {
     const { id } = req.params;
     const { hard } = req.query;
@@ -908,6 +947,15 @@ router.post('/batch-trim', async (req, res, next) => {
         return res.status(400).json({ error: 'Each clip must have assetId, filename, sourceInFrames, sourceOutFrames, timelineInFrames, timelineOutFrames, and a non-negative integer trackIndex' });
       }
     }
+    // Authorize every source asset's project (edit) before queuing any work.
+    const trimAssetIds = [...new Set(clips.map(c => c.assetId))];
+    const owning = await pool.query('SELECT id, project_id FROM assets WHERE id = ANY($1::uuid[])', [trimAssetIds]);
+    const projById = new Map(owning.rows.map(r => [r.id, r.project_id]));
+    for (const aid of trimAssetIds) {
+      const pid = projById.get(aid);
+      if (!pid) return res.status(404).json({ error: 'Asset not found: ' + aid });
+      await assertProjectAccess(req.user, pid, 'edit');
+    }
     const jobId = uuidv4();
     const expiresAt = new Date(Date.now() + 24 * 60 * 60 * 1000);
     await pool.query(
diff --git a/services/mam-api/src/routes/bins.js b/services/mam-api/src/routes/bins.js
index 1fc91db..53359ec 100644
--- a/services/mam-api/src/routes/bins.js
+++ b/services/mam-api/src/routes/bins.js
@@ -1,25 +1,60 @@
 import express from 'express';
 import pool from '../db/pool.js';
 import { validateUuid } from '../middleware/errors.js';
+import { assertProjectAccess, accessibleProjectIds } from '../auth/authz.js';
 import { v4 as uuidv4 } from 'uuid';
 
 const router = express.Router();
-router.param('id', (req, res, next) => validateUuid('id')(req, res, next));
 
-// GET / - List bins. Filter by project_id when supplied; otherwise return
-// every bin across every project so the Library / asset-context-menu can
-// present a global "move to bin" picker.
+// Resolve the owning project for a /:id bin, assert 'view' baseline, stash the
+// project_id for mutating routes to escalate to 'edit'.
+router.param('id', async (req, res, next) => {
+  validateUuid('id')(req, res, () => {});
+  if (res.headersSent) return;
+  try {
+    const { rows } = await pool.query('SELECT project_id FROM bins WHERE id = $1', [req.params.id]);
+    if (rows.length === 0) return res.status(404).json({ error: 'Bin not found' });
+    req.binProjectId = rows[0].project_id;
+    await assertProjectAccess(req.user, req.binProjectId, 'view');
+    next();
+  } catch (err) { next(err); }
+});
+
+async function requireBinEdit(req, res, next) {
+  try {
+    await assertProjectAccess(req.user, req.binProjectId, 'edit');
+    next();
+  } catch (err) { next(err); }
+}
+
+// GET / - List bins. When project_id is supplied, scope to it (after an access
+// check); otherwise return bins across every project the caller can access.
 router.get('/', async (req, res, next) => {
   try {
     const { project_id } = req.query;
 
-    const params = [];
-    let where = '';
     if (project_id) {
-      where = 'WHERE b.project_id = $1';
-      params.push(project_id);
+      await assertProjectAccess(req.user, project_id, 'view');
+      const result = await pool.query(
+        `SELECT b.*, p.name AS project_name,
+                (SELECT COUNT(*)::int FROM assets a WHERE a.bin_id = b.id) AS asset_count
+         FROM bins b
+         LEFT JOIN projects p ON p.id = b.project_id
+         WHERE b.project_id = $1
+         ORDER BY b.created_at DESC`,
+        [project_id]
+      );
+      return res.json(result.rows);
     }
 
+    const access = await accessibleProjectIds(req.user);
+    let where = '';
+    const params = [];
+    if (!access.all) {
+      if (access.ids.size === 0) return res.json([]);
+      where = 'WHERE b.project_id = ANY($1::uuid[])';
+      params.push([...access.ids]);
+    }
     const result = await pool.query(
       `SELECT b.*, p.name AS project_name,
               (SELECT COUNT(*)::int FROM assets a WHERE a.bin_id = b.id) AS asset_count
@@ -29,14 +64,13 @@ router.get('/', async (req, res, next) => {
        ORDER BY b.created_at DESC`,
       params
     );
-
     res.json(result.rows);
   } catch (err) {
     next(err);
   }
 });
 
-// POST / - Create bin
+// POST / - Create bin (requires edit on the target project).
 router.post('/', async (req, res, next) => {
   try {
     const { project_id, name, parent_id } = req.body;
@@ -44,6 +78,7 @@ router.post('/', async (req, res, next) => {
     if (!project_id || !name) {
       return res.status(400).json({ error: 'project_id and name are required' });
     }
+    await assertProjectAccess(req.user, project_id, 'edit');
 
     const id = uuidv4();
 
@@ -61,7 +96,7 @@ router.post('/', async (req, res, next) => {
 });
 
 // PATCH /:id - Update bin
-router.patch('/:id', async (req, res, next) => {
+router.patch('/:id', requireBinEdit, async (req, res, next) => {
   try {
     const { id } = req.params;
     const { name, parent_id } = req.body;
@@ -107,7 +142,7 @@ router.patch('/:id', async (req, res, next) => {
 });
 
 // DELETE /:id - Delete bin
-router.delete('/:id', async (req, res, next) => {
+router.delete('/:id', requireBinEdit, async (req, res, next) => {
   try {
     const { id } = req.params;
 
@@ -126,8 +161,8 @@ router.delete('/:id', async (req, res, next) => {
   }
 });
 
-// POST /:id/assets - Add asset to bin
-router.post('/:id/assets', async (req, res, next) => {
+// POST /:id/assets - Add asset to bin (requires edit on the bin's project).
+router.post('/:id/assets', requireBinEdit, async (req, res, next) => {
   try {
     const { id } = req.params;
     const { asset_id } = req.body;
@@ -158,8 +193,8 @@ router.post('/:id/assets', async (req, res, next) => {
   }
 });
 
-// DELETE /:id/assets/:assetId - Remove asset from bin
-router.delete('/:id/assets/:assetId', async (req, res, next) => {
+// DELETE /:id/assets/:assetId - Remove asset from bin (requires edit).
+router.delete('/:id/assets/:assetId', requireBinEdit, async (req, res, next) => {
   try {
     const { id, assetId } = req.params;
 
diff --git a/services/mam-api/src/routes/capture.js b/services/mam-api/src/routes/capture.js
index 2f14630..de97a96 100644
--- a/services/mam-api/src/routes/capture.js
+++ b/services/mam-api/src/routes/capture.js
@@ -1,3 +1,5 @@
+// TODO(authz): per-project scoping not yet enforced. Capture sessions carry a
+// project_id; adopt assertProjectAccess (auth/authz.js) — see bins.js pattern.
 import express from 'express';
 
 const router = express.Router();
diff --git a/services/mam-api/src/routes/comments.js b/services/mam-api/src/routes/comments.js
index 6701155..1d657de 100644
--- a/services/mam-api/src/routes/comments.js
+++ b/services/mam-api/src/routes/comments.js
@@ -1,5 +1,8 @@
 // Asset-scoped comments for the Asset Detail page.
 //
+// TODO(authz): per-project scoping not yet enforced. Comments hang off an asset
+// (resolve project via the asset); adopt assertProjectAccess (auth/authz.js).
+//
 // Mounted at /api/v1/assets/:assetId/comments via app.use('/api/v1/assets/:assetId/comments', router).
 // Express's :assetId param flows through from the parent mount.
 
diff --git a/services/mam-api/src/routes/imports.js b/services/mam-api/src/routes/imports.js
index 7540e46..d802a46 100644
--- a/services/mam-api/src/routes/imports.js
+++ b/services/mam-api/src/routes/imports.js
@@ -1,5 +1,8 @@
 // External media imports — currently YouTube only.
 //
+// TODO(authz): per-project scoping not yet enforced. Imports target a project_id;
+// adopt assertProjectAccess (auth/authz.js) — see bins.js pattern.
+//
 // The flow mirrors upload.js: create the asset row up front with a placeholder
 // filename (the worker fills in the real title once yt-dlp prints metadata),
 // then enqueue a BullMQ job. The worker downloads, lands the file in S3 at the
diff --git a/services/mam-api/src/routes/projects.js b/services/mam-api/src/routes/projects.js
index 3524ab0..2e0529e 100644
--- a/services/mam-api/src/routes/projects.js
+++ b/services/mam-api/src/routes/projects.js
@@ -1,6 +1,8 @@
 import express from 'express';
 import pool from '../db/pool.js';
 import { validateUuid } from '../middleware/errors.js';
+import { requireAdmin } from '../middleware/auth.js';
+import { accessibleProjectIds, assertProjectAccess } from '../auth/authz.js';
 import { v4 as uuidv4 } from 'uuid';
 
 const router = express.Router();
@@ -16,18 +18,29 @@ const slugify = (str) => {
     .replace(/-+/g, '-');
 };
 
-// GET / - List all projects
+// GET / - List projects the caller can access (admins see all).
 router.get('/', async (req, res, next) => {
   try {
-    const result = await pool.query('SELECT * FROM projects ORDER BY created_at DESC');
+    const access = await accessibleProjectIds(req.user);
+    if (access.all) {
+      const result = await pool.query('SELECT * FROM projects ORDER BY created_at DESC');
+      return res.json(result.rows);
+    }
+    if (access.ids.size === 0) return res.json([]);
+    const ids = [...access.ids];
+    const result = await pool.query(
+      `SELECT * FROM projects WHERE id = ANY($1::uuid[]) ORDER BY created_at DESC`,
+      [ids]
+    );
     res.json(result.rows);
   } catch (err) {
     next(err);
   }
 });
 
-// POST / - Create project
-router.post('/', async (req, res, next) => {
+// POST / - Create project (admin only; new projects have no grants, so a
+// scoped user could never reach one they just made).
+router.post('/', requireAdmin, async (req, res, next) => {
   try {
     const { name, description } = req.body;
 
@@ -51,10 +64,11 @@ router.post('/', async (req, res, next) => {
   }
 });
 
-// GET /:id - Single project with asset count
+// GET /:id - Single project with asset count (requires view access).
 router.get('/:id', async (req, res, next) => {
   try {
     const { id } = req.params;
+    await assertProjectAccess(req.user, id, 'view');
 
     const result = await pool.query(
       `SELECT p.*,
@@ -76,10 +90,11 @@ router.get('/:id', async (req, res, next) => {
   }
 });
 
-// PATCH /:id - Update project
+// PATCH /:id - Update project (requires edit access).
 router.patch('/:id', async (req, res, next) => {
   try {
     const { id } = req.params;
+    await assertProjectAccess(req.user, id, 'edit');
     const { name, description } = req.body;
 
     const updates = [];
@@ -122,8 +137,9 @@ router.patch('/:id', async (req, res, next) => {
   }
 });
 
-// DELETE /:id - Delete project and cascade
-router.delete('/:id', async (req, res, next) => {
+// DELETE /:id - Delete project and cascade (admin only — destructive, wipes
+// every asset/bin/recorder under it).
+router.delete('/:id', requireAdmin, async (req, res, next) => {
   try {
     const { id } = req.params;
 
@@ -143,4 +159,78 @@ router.delete('/:id', async (req, res, next) => {
   }
 });
 
+// ── Per-project access grants (admin only) ──────────────────────────────────
+// GET /:id/access — list grants with resolved user/group display names.
+router.get('/:id/access', requireAdmin, async (req, res, next) => {
+  try {
+    const { rows } = await pool.query(
+      `SELECT pa.subject_type, pa.subject_id, pa.level, pa.granted_at,
+              CASE pa.subject_type
+                WHEN 'user'  THEN u.display_name
+                WHEN 'group' THEN g.name
+              END AS subject_name,
+              CASE pa.subject_type
+                WHEN 'user'  THEN u.username
+                ELSE NULL
+              END AS username
+         FROM project_access pa
+         LEFT JOIN users  u ON pa.subject_type = 'user'  AND u.id = pa.subject_id
+         LEFT JOIN groups g ON pa.subject_type = 'group' AND g.id = pa.subject_id
+        WHERE pa.project_id = $1
+        ORDER BY pa.subject_type, subject_name`,
+      [req.params.id]
+    );
+    res.json(rows);
+  } catch (err) { next(err); }
+});
+
+// POST /:id/access { subject_type, subject_id, level } — grant or update.
+router.post('/:id/access', requireAdmin, async (req, res, next) => {
+  try {
+    const { subject_type, subject_id, level } = req.body || {};
+    if (!['user', 'group'].includes(subject_type)) {
+      return res.status(400).json({ error: "subject_type must be 'user' or 'group'" });
+    }
+    if (!subject_id) return res.status(400).json({ error: 'subject_id required' });
+    const lvl = level || 'view';
+    if (!['view', 'edit'].includes(lvl)) {
+      return res.status(400).json({ error: "level must be 'view' or 'edit'" });
+    }
+
+    // Validate the subject actually exists so we don't create dead grants.
+    const tbl = subject_type === 'user' ? 'users' : 'groups';
+    const exists = await pool.query(`SELECT 1 FROM ${tbl} WHERE id = $1`, [subject_id]);
+    if (exists.rows.length === 0) {
+      return res.status(404).json({ error: subject_type + ' not found' });
+    }
+
+    const { rows } = await pool.query(
+      `INSERT INTO project_access (project_id, subject_type, subject_id, level, granted_by)
+       VALUES ($1, $2, $3, $4, $5)
+       ON CONFLICT (project_id, subject_type, subject_id)
+       DO UPDATE SET level = EXCLUDED.level, granted_by = EXCLUDED.granted_by, granted_at = NOW()
+       RETURNING project_id, subject_type, subject_id, level, granted_at`,
+      [req.params.id, subject_type, subject_id, lvl, req.user?.id || null]
+    );
+    res.status(201).json(rows[0]);
+  } catch (err) { next(err); }
+});
+
+// DELETE /:id/access/:subjectType/:subjectId — revoke a grant.
+router.delete('/:id/access/:subjectType/:subjectId', requireAdmin, async (req, res, next) => {
+  try {
+    const { id, subjectType, subjectId } = req.params;
+    if (!['user', 'group'].includes(subjectType)) {
+      return res.status(400).json({ error: "subjectType must be 'user' or 'group'" });
+    }
+    const { rowCount } = await pool.query(
+      `DELETE FROM project_access
+        WHERE project_id = $1 AND subject_type = $2 AND subject_id = $3`,
+      [id, subjectType, subjectId]
+    );
+    if (rowCount === 0) return res.status(404).json({ error: 'grant not found' });
+    res.status(204).end();
+  } catch (err) { next(err); }
+});
+
 export default router;
diff --git a/services/mam-api/src/routes/recorders.js b/services/mam-api/src/routes/recorders.js
index 316d39e..bbf0967 100644
--- a/services/mam-api/src/routes/recorders.js
+++ b/services/mam-api/src/routes/recorders.js
@@ -1,3 +1,5 @@
+// TODO(authz): per-project scoping not yet enforced. Recorders carry project_id;
+// adopt assertProjectAccess/accessibleProjectIds (auth/authz.js) — see bins.js.
 import express from 'express';
 import http from 'http';
 import fs from 'fs';
diff --git a/services/mam-api/src/routes/sequences.js b/services/mam-api/src/routes/sequences.js
index b7dd20c..6233a76 100644
--- a/services/mam-api/src/routes/sequences.js
+++ b/services/mam-api/src/routes/sequences.js
@@ -1,4 +1,6 @@
 // services/mam-api/src/routes/sequences.js
+// TODO(authz): per-project scoping not yet enforced. Sequences belong to a
+// project; adopt assertProjectAccess (auth/authz.js) — see bins.js pattern.
 import express from 'express';
 import pool    from '../db/pool.js';
 import { getSignedUrlForObject } from '../s3/client.js';
diff --git a/services/mam-api/test/auth/authz.test.js b/services/mam-api/test/auth/authz.test.js
new file mode 100644
index 0000000..4ab34a3
--- /dev/null
+++ b/services/mam-api/test/auth/authz.test.js
@@ -0,0 +1,125 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { isTestDbConfigured, setupTestDb } from '../helpers/setup-db.js';
+import {
+  isAdmin,
+  accessibleProjectIds,
+  projectLevel,
+  assertProjectAccess,
+} from '../../src/auth/authz.js';
+
+const SKIP = !isTestDbConfigured() && 'TEST_DATABASE_URL not set';
+
+// ── isAdmin (pure, no DB) ───────────────────────────────────────────────────
+test('isAdmin true only for role admin', () => {
+  assert.equal(isAdmin({ role: 'admin' }), true);
+  assert.equal(isAdmin({ role: 'editor' }), false);
+  assert.equal(isAdmin({ role: 'viewer' }), false);
+  assert.equal(isAdmin(null), false);
+  assert.equal(isAdmin(undefined), false);
+});
+
+// Seed helpers shared across the DB-backed cases.
+async function seed(pool) {
+  const proj = async (name) =>
+    (await pool.query(
+      `INSERT INTO projects (name, s3_prefix) VALUES ($1, $1) RETURNING id`, [name]
+    )).rows[0].id;
+  const user = async (username, role) =>
+    (await pool.query(
+      `INSERT INTO users (username, password_hash, role) VALUES ($1, 'x', $2) RETURNING id`,
+      [username, role]
+    )).rows[0].id;
+  const group = async (name) =>
+    (await pool.query(`INSERT INTO groups (name) VALUES ($1) RETURNING id`, [name])).rows[0].id;
+  const grantUser = (pid, uid, level) =>
+    pool.query(
+      `INSERT INTO project_access (project_id, subject_type, subject_id, level)
+       VALUES ($1, 'user', $2, $3)`, [pid, uid, level]);
+  const grantGroup = (pid, gid, level) =>
+    pool.query(
+      `INSERT INTO project_access (project_id, subject_type, subject_id, level)
+       VALUES ($1, 'group', $2, $3)`, [pid, gid, level]);
+  const addToGroup = (uid, gid) =>
+    pool.query(`INSERT INTO user_groups (user_id, group_id) VALUES ($1, $2)`, [uid, gid]);
+  return { proj, user, group, grantUser, grantGroup, addToGroup };
+}
+
+test('admin sees all projects, every project at edit', { skip: SKIP }, async () => {
+  const pool = await setupTestDb();
+  try {
+    const s = await seed(pool);
+    await s.proj('Alpha'); await s.proj('Beta');
+    const admin = { id: await s.user('adm', 'admin'), role: 'admin' };
+
+    const acc = await accessibleProjectIds(admin, pool);
+    assert.equal(acc.all, true);
+    assert.equal(await projectLevel(admin, '00000000-0000-4000-8000-000000000001', pool), 'edit');
+    await assertProjectAccess(admin, '00000000-0000-4000-8000-000000000001', 'edit', pool); // no throw
+  } finally { await pool.end(); }
+});
+
+test('direct user grant scopes access and respects level', { skip: SKIP }, async () => {
+  const pool = await setupTestDb();
+  try {
+    const s = await seed(pool);
+    const alpha = await s.proj('Alpha');
+    const beta  = await s.proj('Beta');
+    const u = { id: await s.user('bob', 'editor'), role: 'editor' };
+    await s.grantUser(alpha, u.id, 'view');
+
+    const acc = await accessibleProjectIds(u, pool);
+    assert.equal(acc.all, false);
+    assert.deepEqual([...acc.ids], [alpha]);
+    assert.equal(await projectLevel(u, alpha, pool), 'view');
+    assert.equal(await projectLevel(u, beta, pool), null);
+
+    await assertProjectAccess(u, alpha, 'view', pool); // ok
+    await assert.rejects(() => assertProjectAccess(u, alpha, 'edit', pool), e => e.status === 403);
+    await assert.rejects(() => assertProjectAccess(u, beta, 'view', pool), e => e.status === 403);
+  } finally { await pool.end(); }
+});
+
+test('group grant flows through membership', { skip: SKIP }, async () => {
+  const pool = await setupTestDb();
+  try {
+    const s = await seed(pool);
+    const alpha = await s.proj('Alpha');
+    const u = { id: await s.user('carol', 'viewer'), role: 'viewer' };
+    const g = await s.group('broadcasters');
+    await s.addToGroup(u.id, g);
+    await s.grantGroup(alpha, g, 'edit');
+
+    assert.equal(await projectLevel(u, alpha, pool), 'edit');
+    const acc = await accessibleProjectIds(u, pool);
+    assert.deepEqual([...acc.ids], [alpha]);
+    await assertProjectAccess(u, alpha, 'edit', pool); // ok via group
+  } finally { await pool.end(); }
+});
+
+test('effective level is the max of direct + group grants', { skip: SKIP }, async () => {
+  const pool = await setupTestDb();
+  try {
+    const s = await seed(pool);
+    const alpha = await s.proj('Alpha');
+    const u = { id: await s.user('dan', 'editor'), role: 'editor' };
+    const g = await s.group('team');
+    await s.addToGroup(u.id, g);
+    await s.grantUser(alpha, u.id, 'view');   // direct: view
+    await s.grantGroup(alpha, g, 'edit');     // group: edit → wins
+
+    assert.equal(await projectLevel(u, alpha, pool), 'edit');
+  } finally { await pool.end(); }
+});
+
+test('user with no grants sees nothing', { skip: SKIP }, async () => {
+  const pool = await setupTestDb();
+  try {
+    const s = await seed(pool);
+    await s.proj('Alpha');
+    const u = { id: await s.user('eve', 'viewer'), role: 'viewer' };
+
+    const acc = await accessibleProjectIds(u, pool);
+    assert.equal(acc.ids.size, 0);
+  } finally { await pool.end(); }
+});
diff --git a/services/mam-api/test/routes/assets-access.test.js b/services/mam-api/test/routes/assets-access.test.js
new file mode 100644
index 0000000..99aa598
--- /dev/null
+++ b/services/mam-api/test/routes/assets-access.test.js
@@ -0,0 +1,79 @@
+// Regression test: GET /api/v1/assets must be scoped to the caller's accessible
+// projects. A pre-fix bug returned every asset across every project to any
+// authenticated user, defeating RBAC v2.
+//
+// Like project-access.test.js, the assets router uses the singleton pool, so we
+// point DATABASE_URL at TEST_DATABASE_URL and seed through the same pool.
+// Skips when TEST_DATABASE_URL is unset.
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import express from 'express';
+import { isTestDbConfigured, setupTestDb } from '../helpers/setup-db.js';
+
+const SKIP = !isTestDbConfigured() && 'TEST_DATABASE_URL not set';
+
+async function appWithAssets(user) {
+  process.env.DATABASE_URL = process.env.TEST_DATABASE_URL;
+  process.env.AUTH_ENABLED = 'true';
+  // Importing the assets router constructs BullMQ queues; they connect lazily,
+  // and the list route only touches Postgres, so no Redis is needed here.
+  const { default: assetsRouter } = await import('../../src/routes/assets.js?v=' + Date.now());
+  const app = express();
+  app.use(express.json());
+  app.use((req, _res, next) => { req.user = user; next(); });
+  app.use('/api/v1/assets', assetsRouter);
+  return new Promise(r => {
+    const srv = app.listen(0, '127.0.0.1', () =>
+      r({ baseUrl: 'http://127.0.0.1:' + srv.address().port, close: () => new Promise(rs => srv.close(rs)) }));
+  });
+}
+
+async function seed(pool) {
+  const proj = async (n) => (await pool.query(`INSERT INTO projects (name, s3_prefix) VALUES ($1,$1) RETURNING id`, [n])).rows[0].id;
+  const alpha = await proj('Alpha');
+  const beta  = await proj('Beta');
+  const asset = (pid, name) => pool.query(
+    `INSERT INTO assets (project_id, filename, display_name, media_type, status)
+     VALUES ($1, $2, $2, 'video', 'ready')`, [pid, name]);
+  await asset(alpha, 'a1'); await asset(alpha, 'a2'); await asset(beta, 'b1');
+  const admin  = { id: (await pool.query(`INSERT INTO users (username, password_hash, role) VALUES ('adm','x','admin') RETURNING id`)).rows[0].id, role: 'admin' };
+  const scoped = { id: (await pool.query(`INSERT INTO users (username, password_hash, role) VALUES ('vu','x','viewer') RETURNING id`)).rows[0].id, role: 'viewer' };
+  await pool.query(
+    `INSERT INTO project_access (project_id, subject_type, subject_id, level) VALUES ($1,'user',$2,'view')`,
+    [alpha, scoped.id]);
+  return { alpha, beta, admin, scoped };
+}
+
+test('GET /assets returns only assets in granted projects for scoped users', { skip: SKIP }, async () => {
+  const pool = await setupTestDb();
+  process.env.DATABASE_URL = process.env.TEST_DATABASE_URL;
+  try {
+    const { admin, scoped } = await seed(pool);
+
+    // Admin sees all three.
+    let a = await appWithAssets(admin);
+    let body = await (await fetch(a.baseUrl + '/api/v1/assets')).json();
+    assert.equal(body.assets.length, 3, 'admin should see every asset');
+    await a.close();
+
+    // Scoped viewer (granted only Alpha) sees the two Alpha assets, not Beta's.
+    let s = await appWithAssets(scoped);
+    body = await (await fetch(s.baseUrl + '/api/v1/assets')).json();
+    assert.equal(body.assets.length, 2, 'scoped user should see only granted-project assets');
+    assert.ok(body.assets.every(x => x.display_name !== 'b1'), 'must not leak ungranted-project asset');
+    await s.close();
+  } finally { await pool.end(); }
+});
+
+test('GET /assets returns nothing for a user with no grants', { skip: SKIP }, async () => {
+  const pool = await setupTestDb();
+  process.env.DATABASE_URL = process.env.TEST_DATABASE_URL;
+  try {
+    await seed(pool);
+    const nobody = { id: (await pool.query(`INSERT INTO users (username, password_hash, role) VALUES ('no','x','viewer') RETURNING id`)).rows[0].id, role: 'viewer' };
+    const s = await appWithAssets(nobody);
+    const body = await (await fetch(s.baseUrl + '/api/v1/assets')).json();
+    assert.deepEqual(body, { assets: [], total: 0 });
+    await s.close();
+  } finally { await pool.end(); }
+});
diff --git a/services/mam-api/test/routes/project-access.test.js b/services/mam-api/test/routes/project-access.test.js
new file mode 100644
index 0000000..49d3bf1
--- /dev/null
+++ b/services/mam-api/test/routes/project-access.test.js
@@ -0,0 +1,125 @@
+// Integration test for per-project RBAC: the grant-management API on the
+// projects router + scoped enforcement on GET /projects and GET /projects/:id.
+//
+// NOTE: the routers use the singleton pool (src/db/pool.js), which reads
+// DATABASE_URL. We point DATABASE_URL at the throwaway TEST_DATABASE_URL and
+// seed through that same singleton pool so the router and the test share one
+// database. Skips cleanly when TEST_DATABASE_URL is unset.
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import express from 'express';
+import { isTestDbConfigured, setupTestDb } from '../helpers/setup-db.js';
+
+const SKIP = !isTestDbConfigured() && 'TEST_DATABASE_URL not set';
+
+// Build an app that injects a chosen user as req.user (simulating requireAuth),
+// then mounts the real projects router with the same admin gate index.js uses.
+async function appWithProjects(user) {
+  process.env.DATABASE_URL = process.env.TEST_DATABASE_URL;
+  process.env.AUTH_ENABLED = 'true';
+  const { default: projectsRouter } = await import('../../src/routes/projects.js?v=' + Date.now());
+  const app = express();
+  app.use(express.json());
+  app.use((req, _res, next) => { req.user = user; next(); });
+  app.use('/api/v1/projects', projectsRouter);
+  return new Promise(r => {
+    const srv = app.listen(0, '127.0.0.1', () =>
+      r({ baseUrl: 'http://127.0.0.1:' + srv.address().port, close: () => new Promise(rs => srv.close(rs)) }));
+  });
+}
+
+async function seedBaseline(pool) {
+  const alpha = (await pool.query(`INSERT INTO projects (name, s3_prefix) VALUES ('Alpha','alpha') RETURNING id`)).rows[0].id;
+  const beta  = (await pool.query(`INSERT INTO projects (name, s3_prefix) VALUES ('Beta','beta') RETURNING id`)).rows[0].id;
+  const admin = { id: (await pool.query(`INSERT INTO users (username, password_hash, role) VALUES ('adm','x','admin') RETURNING id`)).rows[0].id, role: 'admin' };
+  const scoped = { id: (await pool.query(`INSERT INTO users (username, password_hash, role) VALUES ('vu','x','viewer') RETURNING id`)).rows[0].id, role: 'viewer' };
+  return { alpha, beta, admin, scoped };
+}
+
+test('admin grants a project, scoped user then sees only it; revoke removes access', { skip: SKIP }, async () => {
+  const pool = await setupTestDb();
+  process.env.DATABASE_URL = process.env.TEST_DATABASE_URL;
+  try {
+    const { alpha, beta, admin, scoped } = await seedBaseline(pool);
+
+    // Scoped viewer initially sees nothing.
+    let s = await appWithProjects(scoped);
+    let list = await (await fetch(s.baseUrl + '/api/v1/projects')).json();
+    assert.equal(list.length, 0, 'scoped user should see no projects before any grant');
+    // And cannot read Alpha directly.
+    let direct = await fetch(s.baseUrl + '/api/v1/projects/' + alpha);
+    assert.equal(direct.status, 403);
+    await s.close();
+
+    // Admin grants the scoped user 'view' on Alpha.
+    const a = await appWithProjects(admin);
+    const grant = await fetch(a.baseUrl + '/api/v1/projects/' + alpha + '/access', {
+      method: 'POST', headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ subject_type: 'user', subject_id: scoped.id, level: 'view' }),
+    });
+    assert.equal(grant.status, 201);
+    const grantList = await (await fetch(a.baseUrl + '/api/v1/projects/' + alpha + '/access')).json();
+    assert.equal(grantList.length, 1);
+    assert.equal(grantList[0].subject_id, scoped.id);
+    await a.close();
+
+    // Scoped viewer now sees exactly Alpha (not Beta), can GET it, cannot PATCH (view-only).
+    s = await appWithProjects(scoped);
+    list = await (await fetch(s.baseUrl + '/api/v1/projects')).json();
+    assert.deepEqual(list.map(p => p.id), [alpha]);
+    assert.equal((await fetch(s.baseUrl + '/api/v1/projects/' + alpha)).status, 200);
+    assert.equal((await fetch(s.baseUrl + '/api/v1/projects/' + beta)).status, 403);
+    const patch = await fetch(s.baseUrl + '/api/v1/projects/' + alpha, {
+      method: 'PATCH', headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ description: 'hacked' }),
+    });
+    assert.equal(patch.status, 403, 'view-level grant must not allow edit');
+    await s.close();
+
+    // Admin revokes; scoped viewer goes back to seeing nothing.
+    const a2 = await appWithProjects(admin);
+    const del = await fetch(a2.baseUrl + '/api/v1/projects/' + alpha + '/access/user/' + scoped.id, { method: 'DELETE' });
+    assert.equal(del.status, 204);
+    await a2.close();
+
+    s = await appWithProjects(scoped);
+    list = await (await fetch(s.baseUrl + '/api/v1/projects')).json();
+    assert.equal(list.length, 0);
+    await s.close();
+  } finally { await pool.end(); }
+});
+
+test('non-admin cannot reach the grant-management API', { skip: SKIP }, async () => {
+  const pool = await setupTestDb();
+  process.env.DATABASE_URL = process.env.TEST_DATABASE_URL;
+  try {
+    const { alpha, scoped } = await seedBaseline(pool);
+    const s = await appWithProjects(scoped);
+    // requireAdmin sits on the access sub-routes; a viewer is 403.
+    const r = await fetch(s.baseUrl + '/api/v1/projects/' + alpha + '/access');
+    assert.equal(r.status, 403);
+    await s.close();
+  } finally { await pool.end(); }
+});
+
+test('edit-level grant allows PATCH', { skip: SKIP }, async () => {
+  const pool = await setupTestDb();
+  process.env.DATABASE_URL = process.env.TEST_DATABASE_URL;
+  try {
+    const { alpha, admin, scoped } = await seedBaseline(pool);
+    const a = await appWithProjects(admin);
+    await fetch(a.baseUrl + '/api/v1/projects/' + alpha + '/access', {
+      method: 'POST', headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ subject_type: 'user', subject_id: scoped.id, level: 'edit' }),
+    });
+    await a.close();
+
+    const s = await appWithProjects(scoped);
+    const patch = await fetch(s.baseUrl + '/api/v1/projects/' + alpha, {
+      method: 'PATCH', headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ description: 'updated by editor' }),
+    });
+    assert.equal(patch.status, 200);
+    await s.close();
+  } finally { await pool.end(); }
+});
diff --git a/services/web-ui/public/app.jsx b/services/web-ui/public/app.jsx
index b49e141..c595577 100644
--- a/services/web-ui/public/app.jsx
+++ b/services/web-ui/public/app.jsx
@@ -97,11 +97,18 @@ function App() {
     );
   }
 
+  // Admin-only destinations. Non-admins who reach one (deep link, keyboard
+  // router, stale tab) get bounced home instead of a broken/forbidden page.
+  // The API enforces the same rules — this is just UX.
+  const ADMIN_ROUTES = new Set(['users', 'containers', 'cluster', 'settings']);
+  const isAdmin = window.ZAMPP_DATA?.ME?.role === 'admin';
+  const effectiveRoute = (ADMIN_ROUTES.has(route) && !isAdmin) ? 'home' : route;
+
   let content;
   if (openAsset) {
     content = <AssetDetail asset={openAsset} onClose={() => setOpenAsset(null)} />;
   } else {
-    switch (route) {
+    switch (effectiveRoute) {
       case 'home':       content = <Home navigate={navigate} />; break;
       case 'dashboard':  content = <Dashboard navigate={navigate} />; break;
       case 'library':   content = <Library navigate={navigate} onOpenAsset={setOpenAsset} openProject={openProject} onClearProject={() => setOpenProject(null)} />; break;
diff --git a/services/web-ui/public/screens-admin.jsx b/services/web-ui/public/screens-admin.jsx
index 2dde801..6098f2f 100644
--- a/services/web-ui/public/screens-admin.jsx
+++ b/services/web-ui/public/screens-admin.jsx
@@ -258,12 +258,26 @@ function Users() {
         {tab === 'groups' && <GroupsPanel groups={groups} users={users} onChange={refreshGroups} />}
 
         {tab === 'policies' && (
-          <div className="panel" style={{ padding: '48px 24px', textAlign: 'center', color: 'var(--text-3)' }}>
-            <Icon name="lock" size={24} />
-            <div style={{ marginTop: 10, fontWeight: 500, fontSize: 14, color: 'var(--text-2)' }}>Access policies</div>
-            <div style={{ fontSize: 12, marginTop: 4 }}>
-              Per-project and per-bin permissions are coming soon. For now, role-based access<br />
-              (admin / editor / viewer) is enforced API-wide.
+          <div className="panel" style={{ padding: '32px 24px', color: 'var(--text-2)' }}>
+            <div style={{ display: 'flex', alignItems: 'center', gap: 8, marginBottom: 12 }}>
+              <Icon name="lock" size={16} />
+              <div style={{ fontWeight: 600, fontSize: 14 }}>Access model</div>
+            </div>
+            <div style={{ fontSize: 12.5, color: 'var(--text-3)', lineHeight: 1.7, maxWidth: 640 }}>
+              <div style={{ marginBottom: 8 }}>
+                <strong style={{ color: 'var(--text-2)' }}>admin</strong> — full access to every
+                project plus user, group, cluster, and system administration.
+              </div>
+              <div style={{ marginBottom: 8 }}>
+                <strong style={{ color: 'var(--text-2)' }}>editor / viewer</strong> — see only the
+                projects they've been granted. A <em>view</em> grant is read-only; an
+                <em> edit</em> grant allows changes. Grants can target an individual user or a group.
+              </div>
+              <div>
+                Manage a project's grants from the <strong style={{ color: 'var(--text-2)' }}>Projects</strong> page
+                → a project's <em>Manage access…</em> menu. Group membership is managed on the
+                Groups tab above.
+              </div>
             </div>
           </div>
         )}
diff --git a/services/web-ui/public/screens-projects.jsx b/services/web-ui/public/screens-projects.jsx
index d87f3e0..67b1a0f 100644
--- a/services/web-ui/public/screens-projects.jsx
+++ b/services/web-ui/public/screens-projects.jsx
@@ -49,6 +49,9 @@ function Projects({ onOpenProject, navigate }) {
   const [showNew, setShowNew] = React.useState(false);
   const [menuFor, setMenuFor] = React.useState(null);
   const [renamingProject, setRenamingProject] = React.useState(null);
+  const [accessProject, setAccessProject] = React.useState(null);
+  const isAdmin = window.ZAMPP_DATA?.ME?.role === 'admin';
+  const manageAccess = (p) => { setMenuFor(null); setAccessProject(p); };
 
   const refresh = React.useCallback(() => {
     window.ZAMPP_API.fetch('/projects')
@@ -122,8 +125,10 @@ function Projects({ onOpenProject, navigate }) {
                 key={p.id}
                 project={p}
                 assets={ASSETS}
+                canManageAccess={isAdmin}
                 onOpen={() => onOpenProject(p)}
                 onRename={() => renameProject(p)}
+                onManageAccess={() => manageAccess(p)}
                 onDelete={() => deleteProject(p)}
               />
             ))}
@@ -148,6 +153,7 @@ function Projects({ onOpenProject, navigate }) {
                     <div className="row-menu" onClick={e => e.stopPropagation()}>
                       <button onClick={() => { setMenuFor(null); onOpenProject(p); }}><Icon name="library" size={11} />Open</button>
                       <button onClick={() => renameProject(p)}><Icon name="edit" size={11} />Rename…</button>
+                      {isAdmin && <button onClick={() => manageAccess(p)}><Icon name="users" size={11} />Manage access…</button>}
                       <button className="danger" onClick={() => deleteProject(p)}><Icon name="trash" size={11} />Delete</button>
                     </div>
                   )}
@@ -165,6 +171,140 @@ function Projects({ onOpenProject, navigate }) {
           onSaved={() => { setRenamingProject(null); refresh(); }}
         />
       )}
+      {accessProject && (
+        <ProjectAccessModal
+          project={accessProject}
+          onClose={() => setAccessProject(null)}
+        />
+      )}
+    </div>
+  );
+}
+
+// Admin-only: grant/revoke per-project access to users and groups.
+// Backed by GET/POST/DELETE /api/v1/projects/:id/access.
+function ProjectAccessModal({ project, onClose }) {
+  const [grants, setGrants]   = React.useState([]);
+  const [users, setUsers]     = React.useState([]);
+  const [groups, setGroups]   = React.useState([]);
+  const [loading, setLoading] = React.useState(true);
+  const [err, setErr]         = React.useState(null);
+
+  // Add-grant form state.
+  const [subjType, setSubjType] = React.useState('user');
+  const [subjId, setSubjId]     = React.useState('');
+  const [level, setLevel]       = React.useState('view');
+
+  const loadGrants = React.useCallback(() => {
+    return window.ZAMPP_API.fetch('/projects/' + project.id + '/access')
+      .then(list => setGrants(list || []))
+      .catch(e => setErr(e.message));
+  }, [project.id]);
+
+  React.useEffect(() => {
+    setLoading(true);
+    Promise.all([
+      loadGrants(),
+      window.ZAMPP_API.fetch('/users').then(setUsers).catch(() => setUsers([])),
+      window.ZAMPP_API.fetch('/groups').then(setGroups).catch(() => setGroups([])),
+    ]).finally(() => setLoading(false));
+  }, [loadGrants]);
+
+  const addGrant = () => {
+    if (!subjId) return;
+    setErr(null);
+    window.ZAMPP_API.fetch('/projects/' + project.id + '/access', {
+      method: 'POST',
+      body: JSON.stringify({ subject_type: subjType, subject_id: subjId, level }),
+    })
+      .then(() => { setSubjId(''); return loadGrants(); })
+      .catch(e => setErr(e.message || 'Failed to add grant'));
+  };
+
+  const revoke = (g) => {
+    window.ZAMPP_API.fetch('/projects/' + project.id + '/access/' + g.subject_type + '/' + g.subject_id, { method: 'DELETE' })
+      .then(loadGrants)
+      .catch(e => setErr(e.message || 'Failed to revoke'));
+  };
+
+  // Candidates for the picker — exclude subjects that already have a grant.
+  const grantedIds = new Set(grants.filter(g => g.subject_type === subjType).map(g => g.subject_id));
+  const candidates = (subjType === 'user' ? users : groups).filter(c => !grantedIds.has(c.id));
+
+  return (
+    <div className="modal-backdrop" onClick={onClose}>
+      <div className="modal" style={{ width: 520 }} onClick={e => e.stopPropagation()}>
+        <div className="modal-head">
+          <div style={{ fontSize: 15, fontWeight: 600 }}>Manage access · {project.name}</div>
+          <button className="icon-btn" aria-label="Close" onClick={onClose}><Icon name="x" /></button>
+        </div>
+        <div className="modal-body">
+          <div style={{ fontSize: 12, color: 'var(--text-3)', marginBottom: 12 }}>
+            Admins always have full access. Grant specific users or groups view (read-only) or
+            edit (read-write) access to this project.
+          </div>
+
+          {/* Add-grant row */}
+          <div style={{ display: 'grid', gridTemplateColumns: '90px 1fr 90px auto', gap: 8, alignItems: 'end', marginBottom: 14 }}>
+            <div className="field" style={{ marginBottom: 0 }}>
+              <label className="field-label">Type</label>
+              <select className="field-input" value={subjType} style={{ appearance: 'auto' }}
+                      onChange={e => { setSubjType(e.target.value); setSubjId(''); }}>
+                <option value="user">User</option>
+                <option value="group">Group</option>
+              </select>
+            </div>
+            <div className="field" style={{ marginBottom: 0 }}>
+              <label className="field-label">{subjType === 'user' ? 'User' : 'Group'}</label>
+              <select className="field-input" value={subjId} style={{ appearance: 'auto' }}
+                      onChange={e => setSubjId(e.target.value)}>
+                <option value="">Pick a {subjType}…</option>
+                {candidates.map(c => (
+                  <option key={c.id} value={c.id}>
+                    {subjType === 'user' ? ('@' + c.username + (c.display_name ? ' · ' + c.display_name : '')) : c.name}
+                  </option>
+                ))}
+              </select>
+            </div>
+            <div className="field" style={{ marginBottom: 0 }}>
+              <label className="field-label">Level</label>
+              <select className="field-input" value={level} style={{ appearance: 'auto' }}
+                      onChange={e => setLevel(e.target.value)}>
+                <option value="view">View</option>
+                <option value="edit">Edit</option>
+              </select>
+            </div>
+            <button className="btn primary sm" onClick={addGrant} disabled={!subjId}>Add</button>
+          </div>
+
+          {err && <div style={{ fontSize: 12, color: 'var(--danger)', marginBottom: 8 }}>{err}</div>}
+
+          {/* Existing grants */}
+          <div className="panel">
+            {loading && <div style={{ padding: 16, color: 'var(--text-3)', fontSize: 12.5 }}>Loading…</div>}
+            {!loading && grants.length === 0 && (
+              <div style={{ padding: '20px 0', textAlign: 'center', color: 'var(--text-3)', fontSize: 12.5 }}>
+                No grants yet — only admins can see this project.
+              </div>
+            )}
+            {!loading && grants.map(g => (
+              <div key={g.subject_type + ':' + g.subject_id}
+                   style={{ display: 'grid', gridTemplateColumns: '20px 1fr 70px 80px', gap: 10, alignItems: 'center', padding: '10px 14px', borderBottom: '1px solid var(--border)' }}>
+                <Icon name={g.subject_type === 'group' ? 'users' : 'user'} size={13} />
+                <div>
+                  <div style={{ fontSize: 13, fontWeight: 500 }}>{g.subject_name || '(deleted)'}</div>
+                  {g.username && <div className="mono" style={{ fontSize: 11, color: 'var(--text-3)' }}>@{g.username}</div>}
+                </div>
+                <span className={`badge ${g.level === 'edit' ? 'accent' : 'neutral'}`}>{g.level}</span>
+                <button className="btn ghost sm danger" onClick={() => revoke(g)}>Revoke</button>
+              </div>
+            ))}
+          </div>
+        </div>
+        <div className="modal-foot">
+          <button className="btn primary sm" onClick={onClose}>Done</button>
+        </div>
+      </div>
     </div>
   );
 }
@@ -206,7 +346,7 @@ function RenameProjectModal({ project, onClose, onSaved }) {
   );
 }
 
-function ProjectCard({ project, assets, onOpen, onRename, onDelete }) {
+function ProjectCard({ project, assets, onOpen, onRename, onManageAccess, onDelete, canManageAccess }) {
   const ofProject = assets.filter(a => a.project_id === project.id);
   const thumbAssets = ofProject.slice(0, 4);
 
@@ -275,6 +415,7 @@ function ProjectCard({ project, assets, onOpen, onRename, onDelete }) {
         <div className="row-menu" style={{ position: 'fixed', top: ctx.y, left: ctx.x, zIndex: 9999 }} onClick={e => e.stopPropagation()}>
           <button onClick={() => { setCtx(null); onOpen(); }}><Icon name="library" size={11} />Open</button>
           <button onClick={() => { setCtx(null); onRename && onRename(); }}><Icon name="edit" size={11} />Rename…</button>
+          {canManageAccess && <button onClick={() => { setCtx(null); onManageAccess && onManageAccess(); }}><Icon name="users" size={11} />Manage access…</button>}
           <button className="danger" onClick={() => { setCtx(null); onDelete && onDelete(); }}><Icon name="trash" size={11} />Delete</button>
         </div>
       )}
@@ -284,3 +425,4 @@ function ProjectCard({ project, assets, onOpen, onRename, onDelete }) {
 
 window.Projects = Projects;
 window.RenameProjectModal = RenameProjectModal;
+window.ProjectAccessModal = ProjectAccessModal;
diff --git a/services/web-ui/public/shell.jsx b/services/web-ui/public/shell.jsx
index 2fb2685..f92458c 100644
--- a/services/web-ui/public/shell.jsx
+++ b/services/web-ui/public/shell.jsx
@@ -126,13 +126,18 @@ function Sidebar({ active, onNavigate, me, collapsed, onToggle }) {
   // (Capture live-signal badge previously lived here; it now belongs in the
   // topbar status pip alongside the cluster pip. See issue #149.)
 
-  // Apply the live Jobs badge to the Operations section.
+  // Apply the live Jobs badge to the Operations section, and gate the Admin
+  // section to admins only (RBAC v2). Non-admins never see Users/Cluster/etc.
+  // This is UX only — the API enforces the same rules server-side.
+  const isAdmin = me?.role === 'admin';
   const sections = React.useMemo(
-    () => NAV_SECTIONS.map(sec => ({
-      ...sec,
-      items: sec.items.map(n => (n.id === 'jobs' && jobsBadge) ? { ...n, badge: jobsBadge } : n),
-    })),
-    [jobsBadge]
+    () => NAV_SECTIONS
+      .filter(sec => sec.label !== 'Admin' || isAdmin)
+      .map(sec => ({
+        ...sec,
+        items: sec.items.map(n => (n.id === 'jobs' && jobsBadge) ? { ...n, badge: jobsBadge } : n),
+      })),
+    [jobsBadge, isAdmin]
   );
   const toggleGroup = (id) => {
     setOpenGroups(prev => {