diff --git a/packages/api/src/routers/board.ts b/packages/api/src/routers/board.ts
index fd300312..31796a83 100644
--- a/packages/api/src/routers/board.ts
+++ b/packages/api/src/routers/board.ts
@@ -173,8 +173,31 @@ export const boardRouter = createTRPCRouter({
           }
         : result.workspace;
 
+      // Generate presigned URLs for card member avatars
+      const listsWithAvatarUrls = await Promise.all(
+        result.lists.map(async (list) => ({
+          ...list,
+          cards: await Promise.all(
+            list.cards.map(async (card) => ({
+              ...card,
+              members: await Promise.all(
+                card.members.map(async (member) => {
+                  if (!member.user?.image) return member;
+                  const avatarUrl = await generateAvatarUrl(member.user.image);
+                  return {
+                    ...member,
+                    user: { ...member.user, image: avatarUrl },
+                  };
+                }),
+              ),
+            })),
+          ),
+        })),
+      );
+
       return {
         ...result,
+        lists: listsWithAvatarUrls,
         workspace: workspaceWithAvatarUrls,
       };
     }),