diff --git a/cameleer3-server-app/src/main/java/com/cameleer3/server/app/security/UiAuthController.java b/cameleer3-server-app/src/main/java/com/cameleer3/server/app/security/UiAuthController.java
index 6049514b..e508f1d3 100644
--- a/cameleer3-server-app/src/main/java/com/cameleer3/server/app/security/UiAuthController.java
+++ b/cameleer3-server-app/src/main/java/com/cameleer3/server/app/security/UiAuthController.java
@@ -7,6 +7,7 @@ import com.cameleer3.server.core.admin.AuditResult;
 import com.cameleer3.server.core.admin.AuditService;
 import com.cameleer3.server.core.rbac.RbacService;
 import com.cameleer3.server.core.rbac.SystemRole;
+import com.cameleer3.server.core.rbac.UserDetail;
 import com.cameleer3.server.core.security.JwtService;
 import jakarta.servlet.http.HttpServletRequest;
 import com.cameleer3.server.core.security.JwtService.JwtValidationResult;
@@ -22,6 +23,8 @@ import org.slf4j.LoggerFactory;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
@@ -149,6 +152,21 @@ public class UiAuthController {
         }
     }
 
+    @GetMapping("/me")
+    @Operation(summary = "Get current user details")
+    @ApiResponse(responseCode = "200", description = "Current user details")
+    @ApiResponse(responseCode = "401", description = "Not authenticated")
+    public ResponseEntity<UserDetail> me(Authentication authentication) {
+        if (authentication == null || authentication.getName() == null) {
+            throw new ResponseStatusException(HttpStatus.UNAUTHORIZED, "Not authenticated");
+        }
+        UserDetail detail = rbacService.getUser(authentication.getName());
+        if (detail == null) {
+            throw new ResponseStatusException(HttpStatus.UNAUTHORIZED, "User not found");
+        }
+        return ResponseEntity.ok(detail);
+    }
+
     public record LoginRequest(String username, String password) {}
     public record RefreshRequest(String refreshToken) {}
 }
diff --git a/ui/package-lock.json b/ui/package-lock.json
index 25b594fe..32726a83 100644
--- a/ui/package-lock.json
+++ b/ui/package-lock.json
@@ -9,7 +9,7 @@
       "version": "0.0.0",
       "hasInstallScript": true,
       "dependencies": {
-        "@cameleer/design-system": "^0.1.38",
+        "@cameleer/design-system": "^0.0.0-snapshot.20260408.7e54514",
         "@tanstack/react-query": "^5.90.21",
         "lucide-react": "^1.7.0",
         "openapi-fetch": "^0.17.0",
@@ -279,9 +279,9 @@
       }
     },
     "node_modules/@cameleer/design-system": {
-      "version": "0.1.38",
-      "resolved": "https://gitea.siegeln.net/api/packages/cameleer/npm/%40cameleer%2Fdesign-system/-/0.1.38/design-system-0.1.38.tgz",
-      "integrity": "sha512-8tsWZTYkLg3JbvA8p+MVP05nsuJnIXZZvgx6d71e7BO3rtoI8bpvQn/ZElag6tQnBEbeqStQqqDnZ5TAWN2pvw==",
+      "version": "0.0.0-snapshot.20260408.7e54514",
+      "resolved": "https://gitea.siegeln.net/api/packages/cameleer/npm/%40cameleer%2Fdesign-system/-/0.0.0-snapshot.20260408.7e54514/design-system-0.0.0-snapshot.20260408.7e54514.tgz",
+      "integrity": "sha512-YgwpQfwewx7gljOnl2s6V4Ixp4D1R0t+rMf7h06Tc6dOGikibZ9GL37nxqY/6YxwrfqMRkj6DBDEfjrv0iFF7g==",
       "dependencies": {
         "lucide-react": "^1.7.0",
         "react": "^19.0.0",
diff --git a/ui/package.json b/ui/package.json
index 7247b447..79795a46 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -15,7 +15,7 @@
     "postinstall": "node -e \"const fs=require('fs');fs.mkdirSync('public',{recursive:true});fs.copyFileSync('node_modules/@cameleer/design-system/assets/cameleer3-logo.svg','public/favicon.svg')\""
   },
   "dependencies": {
-    "@cameleer/design-system": "^0.1.38",
+    "@cameleer/design-system": "^0.0.0-snapshot.20260408.7e54514",
     "@tanstack/react-query": "^5.90.21",
     "lucide-react": "^1.7.0",
     "openapi-fetch": "^0.17.0",
diff --git a/ui/src/api/queries/auth.ts b/ui/src/api/queries/auth.ts
new file mode 100644
index 00000000..343f462b
--- /dev/null
+++ b/ui/src/api/queries/auth.ts
@@ -0,0 +1,48 @@
+import { useQuery } from '@tanstack/react-query';
+import { config } from '../../config';
+import { useAuthStore } from '../../auth/auth-store';
+
+export interface RoleSummary {
+  id: string;
+  name: string;
+  system: boolean;
+  source: string;
+}
+
+export interface GroupSummary {
+  id: string;
+  name: string;
+}
+
+export interface UserDetail {
+  userId: string;
+  provider: string;
+  email: string;
+  displayName: string;
+  createdAt: string;
+  directRoles: RoleSummary[];
+  directGroups: GroupSummary[];
+  effectiveRoles: RoleSummary[];
+  effectiveGroups: GroupSummary[];
+}
+
+async function fetchMe(): Promise<UserDetail> {
+  const token = useAuthStore.getState().accessToken;
+  const res = await fetch(`${config.apiBaseUrl}/auth/me`, {
+    headers: {
+      ...(token ? { Authorization: `Bearer ${token}` } : {}),
+      'X-Cameleer-Protocol-Version': '1',
+    },
+  });
+  if (!res.ok) throw new Error(`API error: ${res.status}`);
+  return res.json();
+}
+
+export function useMe(enabled = false) {
+  return useQuery({
+    queryKey: ['auth', 'me'],
+    queryFn: fetchMe,
+    enabled,
+    staleTime: 30_000,
+  });
+}
diff --git a/ui/src/components/AboutMeDialog.module.css b/ui/src/components/AboutMeDialog.module.css
new file mode 100644
index 00000000..b46f5853
--- /dev/null
+++ b/ui/src/components/AboutMeDialog.module.css
@@ -0,0 +1,57 @@
+.loading {
+  display: flex;
+  justify-content: center;
+  padding: 2rem;
+}
+
+.content {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+}
+
+.metaGrid {
+  display: grid;
+  grid-template-columns: auto 1fr;
+  gap: 6px 16px;
+  font-size: 12px;
+  font-family: var(--font-body);
+  margin-bottom: 8px;
+}
+
+.metaLabel {
+  color: var(--text-muted);
+  font-weight: 500;
+}
+
+.metaValue {
+  color: var(--text-primary);
+}
+
+.tagList {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  margin-top: 4px;
+  margin-bottom: 8px;
+}
+
+.sourceList {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+  margin-bottom: 8px;
+}
+
+.sourceNote {
+  font-size: 11px;
+  color: var(--text-muted);
+  font-family: var(--font-mono);
+}
+
+.empty {
+  font-size: 12px;
+  color: var(--text-muted);
+  font-style: italic;
+  font-family: var(--font-body);
+}
diff --git a/ui/src/components/AboutMeDialog.tsx b/ui/src/components/AboutMeDialog.tsx
new file mode 100644
index 00000000..0af25fc1
--- /dev/null
+++ b/ui/src/components/AboutMeDialog.tsx
@@ -0,0 +1,74 @@
+import { Modal, Badge, MonoText, Spinner, SectionHeader } from '@cameleer/design-system';
+import { useMe } from '../api/queries/auth';
+import styles from './AboutMeDialog.module.css';
+
+interface AboutMeDialogProps {
+  open: boolean;
+  onClose: () => void;
+}
+
+export function AboutMeDialog({ open, onClose }: AboutMeDialogProps) {
+  const { data: user, isLoading } = useMe(open);
+
+  return (
+    <Modal open={open} onClose={onClose} title="About Me" size="sm">
+      {isLoading || !user ? (
+        <div className={styles.loading}><Spinner size="md" /></div>
+      ) : (
+        <div className={styles.content}>
+          <div className={styles.metaGrid}>
+            <span className={styles.metaLabel}>Name</span>
+            <span className={styles.metaValue}>{user.displayName}</span>
+            <span className={styles.metaLabel}>User ID</span>
+            <MonoText size="xs">{user.userId}</MonoText>
+            <span className={styles.metaLabel}>Provider</span>
+            <span className={styles.metaValue}>{user.provider}</span>
+            {user.email && (
+              <>
+                <span className={styles.metaLabel}>Email</span>
+                <span className={styles.metaValue}>{user.email}</span>
+              </>
+            )}
+            <span className={styles.metaLabel}>Created</span>
+            <span className={styles.metaValue}>
+              {new Date(user.createdAt).toLocaleDateString()}
+            </span>
+          </div>
+
+          <SectionHeader>Roles</SectionHeader>
+          <div className={styles.tagList}>
+            {user.effectiveRoles.length === 0 && (
+              <span className={styles.empty}>No roles assigned</span>
+            )}
+            {user.effectiveRoles.map((role) => (
+              <Badge
+                key={role.id}
+                label={role.name}
+                color={role.name === 'ADMIN' ? 'error' : role.name === 'OPERATOR' ? 'warning' : 'auto'}
+              />
+            ))}
+          </div>
+          {user.effectiveRoles.some((r) => r.source !== 'direct') && (
+            <div className={styles.sourceList}>
+              {user.effectiveRoles.map((role) => (
+                <span key={role.id} className={styles.sourceNote}>
+                  {role.name}: {role.source}
+                </span>
+              ))}
+            </div>
+          )}
+
+          <SectionHeader>Groups</SectionHeader>
+          <div className={styles.tagList}>
+            {user.effectiveGroups.length === 0 && (
+              <span className={styles.empty}>No group memberships</span>
+            )}
+            {user.effectiveGroups.map((group) => (
+              <Badge key={group.id} label={group.name} color="auto" />
+            ))}
+          </div>
+        </div>
+      )}
+    </Modal>
+  );
+}
diff --git a/ui/src/components/LayoutShell.tsx b/ui/src/components/LayoutShell.tsx
index 040c06da..b5dfca2b 100644
--- a/ui/src/components/LayoutShell.tsx
+++ b/ui/src/components/LayoutShell.tsx
@@ -15,9 +15,10 @@ import {
   useGlobalFilters,
   useStarred,
 } from '@cameleer/design-system';
-import type { SearchResult, SidebarTreeNode } from '@cameleer/design-system';
+import type { SearchResult, SidebarTreeNode, DropdownItem } from '@cameleer/design-system';
 import sidebarLogo from '@cameleer/design-system/assets/cameleer3-logo.svg';
-import { Box, Settings, FileText, ChevronRight, Square, Pause, Star, X } from 'lucide-react';
+import { Box, Settings, FileText, ChevronRight, Square, Pause, Star, X, User } from 'lucide-react';
+import { AboutMeDialog } from './AboutMeDialog';
 import css from './LayoutShell.module.css';
 import { useQueryClient } from '@tanstack/react-query';
 import { useRouteCatalog } from '../api/queries/catalog';
@@ -437,6 +438,12 @@ function LayoutContent() {
 
   const effectiveSelectedPath = sidebarRevealPath ?? location.pathname;
 
+  // --- About Me dialog -----------------------------------------------
+  const [aboutMeOpen, setAboutMeOpen] = useState(false);
+  const userMenuItems: DropdownItem[] = useMemo(() => [
+    { label: 'About Me', icon: createElement(User, { size: 14 }), onClick: () => setAboutMeOpen(true) },
+  ], []);
+
   // --- Exchange full-text search via command palette -----------------
   const [paletteQuery, setPaletteQuery] = useState('');
   const debouncedQuery = useDebouncedValue(paletteQuery, 300);
@@ -724,8 +731,10 @@ function LayoutContent() {
           />
         }
         user={username ? { name: username } : undefined}
+        userMenuItems={userMenuItems}
         onLogout={handleLogout}
       />
+      <AboutMeDialog open={aboutMeOpen} onClose={() => setAboutMeOpen(false)} />
       <CommandPalette
         key={isAdminPage ? 'admin' : 'ops'}
         open={paletteOpen}