diff --git a/backend/src/handlers/setup.rs b/backend/src/handlers/setup.rs
index 55f6875..ae44d8c 100644
--- a/backend/src/handlers/setup.rs
+++ b/backend/src/handlers/setup.rs
@@ -6,6 +6,8 @@ use axum::{
 };
 use serde::{Deserialize, Serialize};
 use utoipa::ToSchema;
+use axum_extra::extract::cookie::{Cookie, CookieJar, SameSite};
+use time::Duration;
 
 #[derive(Deserialize, ToSchema)]
 pub struct SetupRequest {
@@ -41,7 +43,7 @@ pub async fn get_setup_status_handler(State(state): State<AppState>) -> impl Int
     path = "/api/setup",
     request_body = SetupRequest,
     responses(
-        (status = 200, description = "Setup completed"),
+        (status = 200, description = "Setup completed and logged in"),
         (status = 400, description = "Invalid request"),
         (status = 403, description = "Setup already completed"),
         (status = 500, description = "Internal server error")
@@ -49,6 +51,7 @@ pub async fn get_setup_status_handler(State(state): State<AppState>) -> impl Int
 )]
 pub async fn setup_handler(
     State(state): State<AppState>,
+    jar: CookieJar,
     Json(payload): Json<SetupRequest>,
 ) -> impl IntoResponse {
     // 1. Check if setup is already completed (i.e., users exist)
@@ -68,7 +71,6 @@ pub async fn setup_handler(
 
     // 3. Create User
     // Lower cost for faster login on low-power devices (MIPS routers etc.)
-    // Default is usually 12, which takes ~3s on slow CPUs. 6 should be much faster.
     let password_hash = match bcrypt::hash(&payload.password, 6) {
         Ok(h) => h,
         Err(e) => {
@@ -82,5 +84,42 @@ pub async fn setup_handler(
         return (StatusCode::INTERNAL_SERVER_ERROR, "Failed to create user").into_response();
     }
 
-    (StatusCode::OK, "Setup completed successfully").into_response()
+    // 4. Auto-Login (Create Session)
+    // Get the created user's ID
+    let user = match state.db.get_user_by_username(&payload.username).await {
+        Ok(Some(u)) => u,
+        Ok(None) => return (StatusCode::INTERNAL_SERVER_ERROR, "User created but not found").into_response(),
+        Err(e) => {
+            tracing::error!("DB error fetching new user: {}", e);
+            return (StatusCode::INTERNAL_SERVER_ERROR, "Database error").into_response();
+        }
+    };
+    let (user_id, _) = user;
+
+    // Create session token
+    let token: String = (0..32).map(|_| {
+        use rand::{distributions::Alphanumeric, Rng};
+        rand::thread_rng().sample(Alphanumeric) as char
+    }).collect();
+
+    // Default expiration: 1 day (since it's not "remember me")
+    let expires_in = 60 * 60 * 24;
+    let expires_at = time::OffsetDateTime::now_utc().unix_timestamp() + expires_in;
+
+    if let Err(e) = state.db.create_session(user_id, &token, expires_at).await {
+        tracing::error!("Failed to create session for new user: {}", e);
+        // Even if session fails, setup is technically complete, but login failed.
+        // We return OK but user will have to login manually.
+        return (StatusCode::OK, "Setup completed, please login").into_response();
+    }
+
+    let mut cookie = Cookie::build(("auth_token", token))
+        .path("/")
+        .http_only(true)
+        .same_site(SameSite::Lax)
+        .build();
+
+    cookie.set_max_age(Duration::seconds(expires_in));
+
+    (StatusCode::OK, jar.add(cookie), "Setup completed and logged in").into_response()
 }
diff --git a/frontend/src/components/auth/setup.rs b/frontend/src/components/auth/setup.rs
index b14df34..ac71c3a 100644
--- a/frontend/src/components/auth/setup.rs
+++ b/frontend/src/components/auth/setup.rs
@@ -48,8 +48,9 @@ pub fn Setup() -> impl IntoView {
             match client.send().await {
                 Ok(resp) => {
                     if resp.ok() {
-                        // Redirect to login after setup (full reload to be safe)
-                        let _ = window().location().set_href("/login");
+                        // Redirect to home after setup (auto-login handled by backend)
+                        // Full reload to ensure auth state is refreshed
+                        let _ = window().location().set_href("/");
                     } else {
                         let text = resp.text().await.unwrap_or_default();
                         set_error.set(Some(format!("Hata: {}", text)));