diff --git a/src/components/ProjectFiles.tsx b/src/components/ProjectFiles.tsx
index e9d8ce2..a827431 100644
--- a/src/components/ProjectFiles.tsx
+++ b/src/components/ProjectFiles.tsx
@@ -225,7 +225,7 @@ export default function ProjectFiles({ project }: Props) {
 
                   {/* Uploader */}
                   <div className="text-xs text-[var(--muted)] hidden md:block shrink-0">
-                    {f.uploader?.name}
+                    {f.uploaded_by?.name}
                   </div>
 
                   {/* Date */}
diff --git a/src/lib/api.ts b/src/lib/api.ts
index ed66c26..c8e1ad8 100644
--- a/src/lib/api.ts
+++ b/src/lib/api.ts
@@ -44,6 +44,14 @@ async function request<T = any>(path: string, options: RequestInit = {}): Promis
 
 // --- Types ---
 
+// --- Shared types (1:1 with backend Pydantic schemas) ---
+
+export interface MemberBrief {
+  id: string;
+  slug: string;
+  name: string;
+}
+
 export interface AgentConfig {
   capabilities: string[];
   chat_listen: string;
@@ -60,6 +68,7 @@ export interface Member {
   role: string;
   status: string;
   avatar_url: string | null;
+  is_active: boolean;
   agent_config: AgentConfig | null;
   token?: string | null;
 }
@@ -84,14 +93,16 @@ export interface ProjectMember {
   name: string;
   slug: string;
   type: "human" | "agent";
-  role: string; // "owner" | "member"
+  role: string;
 }
 
 export interface Step {
   id: string;
+  task_id: string;
   title: string;
   done: boolean;
   position: number;
+  created_at: string;
 }
 
 export interface Task {
@@ -107,14 +118,16 @@ export interface Task {
   priority: string;
   labels: string[];
   assignee_id: string | null;
-  assignee: Member | null;
+  assignee: MemberBrief | null;
   reviewer_id: string | null;
-  reviewer: Member | null;
+  reviewer: MemberBrief | null;
   watcher_ids: string[];
   depends_on: string[];
   position: number;
   time_spent: number;
   steps: Step[];
+  created_at: string;
+  updated_at: string;
 }
 
 export interface Attachment {
@@ -130,8 +143,8 @@ export interface Message {
   task_id: string | null;
   parent_id: string | null;
   author_type: string;
-  author_id: string;
-  author: Member | null;
+  author_id: string | null;
+  author: MemberBrief | null;
   content: string;
   mentions: string[];
   voice_url: string | null;
@@ -306,13 +319,11 @@ export async function revokeToken(slug: string): Promise<void> {
 
 export interface ProjectFile {
   id: string;
-  project_id: string;
   filename: string;
   description: string | null;
   mime_type: string | null;
   size: number;
-  uploaded_by: string;
-  uploader: { id: string; slug: string; name: string } | null;
+  uploaded_by: MemberBrief | null;
   created_at: string;
   updated_at: string;
 }