diff --git a/app/lib/profile.ts b/app/lib/profile.ts
index 9b7588a..ac454d0 100644
--- a/app/lib/profile.ts
+++ b/app/lib/profile.ts
@@ -1,12 +1,13 @@
-// Local user preferences — title, bio, signature, avatar, default agent.
-// Persisted in localStorage; reactive across tabs. Identity (name, email)
-// is owned by the arcadia session, not this store — see ~/lib/session.ts.
+// Local user preferences — title, signature, default agent, plus a cache
+// mirror of the resolved avatar URL. Persisted in localStorage; reactive
+// across tabs. Identity (name, email) is owned by the arcadia session
+// (~/lib/session.ts); the public profile (bio, phone, location, timezone)
+// is server-backed via /api/v1/profile (~/lib/arcadia/profiles.ts).
 
 import { useEffect, useSyncExternalStore } from "react"
 
 export type Profile = {
   title: string
-  bio: string
   signature: string
   avatarUrl: string
   defaultAgentId: string
@@ -14,7 +15,6 @@ export type Profile = {
 
 export const DEFAULT_PROFILE: Profile = {
   title: "",
-  bio: "",
   signature: "",
   avatarUrl: "",
   defaultAgentId: "",
@@ -32,7 +32,6 @@ function readFromStorage(): Profile {
     return {
       title:
         typeof parsed.title === "string" ? parsed.title : DEFAULT_PROFILE.title,
-      bio: typeof parsed.bio === "string" ? parsed.bio : DEFAULT_PROFILE.bio,
       signature:
         typeof parsed.signature === "string"
           ? parsed.signature
diff --git a/app/routes/profile.tsx b/app/routes/profile.tsx
index d12a620..c4e83f9 100644
--- a/app/routes/profile.tsx
+++ b/app/routes/profile.tsx
@@ -82,6 +82,24 @@ export default function ProfileRoute() {
   const [avatarUploading, setAvatarUploading] = useState(false)
   const [avatarError, setAvatarError] = useState<string | null>(null)
 
+  // Public-profile editable fields, server-backed via PATCH /api/v1/profile.
+  const [profileDraft, setProfileDraft] = useState<{
+    bio: string
+    phone: string
+    location: string
+    timezone: string
+  }>({ bio: "", phone: "", location: "", timezone: "" })
+  const [profileSaving, setProfileSaving] = useState(false)
+  const [profileSavedAt, setProfileSavedAt] = useState<number | null>(null)
+  const [profileError, setProfileError] = useState<string | null>(null)
+
+  const profileDirty =
+    !!arcadiaProfile &&
+    (profileDraft.bio !== (arcadiaProfile.bio ?? "") ||
+      profileDraft.phone !== (arcadiaProfile.phone ?? "") ||
+      profileDraft.location !== (arcadiaProfile.location ?? "") ||
+      profileDraft.timezone !== (arcadiaProfile.timezone ?? ""))
+
   const loadAccount = useCallback(async () => {
     if (!session) return
     setAccountLoading(true)
@@ -99,6 +117,12 @@ export default function ProfileRoute() {
       })
       if (p) {
         setArcadiaProfile(p)
+        setProfileDraft({
+          bio: p.bio ?? "",
+          phone: p.phone ?? "",
+          location: p.location ?? "",
+          timezone: p.timezone ?? "",
+        })
         const url = pickAvatarUrl(p)
         if (url) setPrefs((d) => ({ ...d, avatarUrl: url }))
       }
@@ -143,6 +167,37 @@ export default function ProfileRoute() {
     }
   }
 
+  const saveArcadiaProfile = async () => {
+    setProfileSaving(true)
+    setProfileError(null)
+    try {
+      const updated = await updateArcadiaProfile(arcadia, {
+        bio: profileDraft.bio || null,
+        phone: profileDraft.phone || null,
+        location: profileDraft.location || null,
+        timezone: profileDraft.timezone || null,
+      })
+      setArcadiaProfile(updated)
+      setProfileDraft({
+        bio: updated.bio ?? "",
+        phone: updated.phone ?? "",
+        location: updated.location ?? "",
+        timezone: updated.timezone ?? "",
+      })
+      setProfileSavedAt(Date.now())
+    } catch (err) {
+      setProfileError(
+        err instanceof ArcadiaError
+          ? err.message
+          : err instanceof Error
+            ? err.message
+            : "Save failed.",
+      )
+    } finally {
+      setProfileSaving(false)
+    }
+  }
+
   // Local prefs handlers.
   const initials = profileInitials(
     [accountDraft.first_name, accountDraft.last_name].filter(Boolean).join(" ") ||
@@ -366,12 +421,106 @@ export default function ProfileRoute() {
         </CardContent>
       </Card>
 
+      <Card>
+        <CardHeader>
+          <CardTitle>Profile</CardTitle>
+          <CardDescription>
+            Public profile fields stored on arcadia. Visible to other members
+            of this tenant.
+          </CardDescription>
+        </CardHeader>
+        <CardContent className="flex flex-col gap-4">
+          {profileError ? (
+            <AlertBanner variant="error">{profileError}</AlertBanner>
+          ) : null}
+          <Field
+            label="Bio"
+            hint="A short blurb about you."
+          >
+            <Textarea
+              data-action="profile-bio"
+              value={profileDraft.bio}
+              onChange={(e) =>
+                setProfileDraft((d) => ({ ...d, bio: e.target.value }))
+              }
+              rows={3}
+              placeholder="Tell others what you work on."
+            />
+          </Field>
+          <div className="grid gap-4 md:grid-cols-2">
+            <Field label="Phone">
+              <Input
+                data-action="profile-phone"
+                value={profileDraft.phone}
+                onChange={(e) =>
+                  setProfileDraft((d) => ({ ...d, phone: e.target.value }))
+                }
+                placeholder="+61 …"
+              />
+            </Field>
+            <Field label="Location">
+              <Input
+                data-action="profile-location"
+                value={profileDraft.location}
+                onChange={(e) =>
+                  setProfileDraft((d) => ({ ...d, location: e.target.value }))
+                }
+                placeholder="Melbourne, AU"
+              />
+            </Field>
+            <Field
+              label="Timezone"
+              hint="IANA name (e.g. Australia/Melbourne)."
+            >
+              <Input
+                data-action="profile-timezone"
+                value={profileDraft.timezone}
+                onChange={(e) =>
+                  setProfileDraft((d) => ({ ...d, timezone: e.target.value }))
+                }
+                placeholder="Australia/Melbourne"
+              />
+            </Field>
+          </div>
+          <div className="flex flex-wrap items-center gap-2">
+            <Button
+              data-action="profile-arcadia-save"
+              onClick={saveArcadiaProfile}
+              disabled={!profileDirty || profileSaving}
+            >
+              {profileSaving ? "Saving…" : "Save profile"}
+            </Button>
+            <Button
+              data-action="profile-arcadia-revert"
+              variant="ghost"
+              onClick={() => {
+                if (!arcadiaProfile) return
+                setProfileDraft({
+                  bio: arcadiaProfile.bio ?? "",
+                  phone: arcadiaProfile.phone ?? "",
+                  location: arcadiaProfile.location ?? "",
+                  timezone: arcadiaProfile.timezone ?? "",
+                })
+              }}
+              disabled={!profileDirty || profileSaving}
+            >
+              Revert
+            </Button>
+            {profileSavedAt && !profileDirty ? (
+              <span className="inline-flex items-center gap-1 text-sm text-emerald-700 dark:text-emerald-400">
+                <Check className="size-4" /> Saved.
+              </span>
+            ) : null}
+          </div>
+        </CardContent>
+      </Card>
+
       <Card>
         <CardHeader>
           <CardTitle>Preferences</CardTitle>
           <CardDescription>
             Avatar uploads land in your tenant's storage backend; the rest
-            (bio, signature, default persona) stays local to this browser.
+            (title, signature, default persona) stays local to this browser.
           </CardDescription>
         </CardHeader>
         <CardContent className="flex flex-col gap-6">
@@ -482,19 +631,6 @@ export default function ProfileRoute() {
             </Field>
           </div>
 
-          <Field
-            label="Bio"
-            hint="A short blurb the assistant can reference (e.g. 'I work mostly in TypeScript')."
-          >
-            <Textarea
-              data-action="profile-bio"
-              value={prefs.bio}
-              onChange={(e) => setPrefs((d) => ({ ...d, bio: e.target.value }))}
-              rows={3}
-              placeholder="Tell the assistant about you."
-            />
-          </Field>
-
           <Field
             label="Signature"
             hint="Appended automatically when you ask the assistant to draft an email or note."