diff --git a/backend/src/services/notification.service.js b/backend/src/services/notification.service.js
index b418f70..c055961 100644
--- a/backend/src/services/notification.service.js
+++ b/backend/src/services/notification.service.js
@@ -21,6 +21,14 @@ export const sendPushNotification = async (recipientType, recipientId, { title,
 
   if (!user?.fcm_token) return false
 
+  // Mitra app ships a branded notification sound on its own channel
+  // (`halobestie_chat_v1`, declared in mitra_app/lib/core/notifications/
+  // notification_service.dart). Customer app keeps the legacy
+  // `chat_messages` channel until/unless we ship a customer sound too.
+  const androidChannelId = recipientType === UserType.MITRA
+    ? 'halobestie_chat_v1'
+    : 'chat_messages'
+
   try {
     await admin.messaging().send({
       token: user.fcm_token,
@@ -33,7 +41,7 @@ export const sendPushNotification = async (recipientType, recipientId, { title,
       },
       android: {
         priority: 'high',
-        notification: { channelId: 'chat_messages' },
+        notification: { channelId: androidChannelId },
       },
       apns: {
         payload: {
diff --git a/mitra_app/android/app/src/main/res/raw/halobestie_notif.ogg b/mitra_app/android/app/src/main/res/raw/halobestie_notif.ogg
new file mode 100644
index 0000000..c36af26
Binary files /dev/null and b/mitra_app/android/app/src/main/res/raw/halobestie_notif.ogg differ
diff --git a/mitra_app/lib/core/notifications/notification_service.dart b/mitra_app/lib/core/notifications/notification_service.dart
index d0640f0..72bf5de 100644
--- a/mitra_app/lib/core/notifications/notification_service.dart
+++ b/mitra_app/lib/core/notifications/notification_service.dart
@@ -12,11 +12,18 @@ class NotificationService {
   /// Set this from the app to bridge notifications → Riverpod state.
   static void Function(String sessionId)? onChatRequestTapped;
 
+  // Channel ID is bumped (`chat_messages` → `halobestie_chat_v1`) because
+  // Android binds notification sound at channel-creation time on API 26+. An
+  // existing `chat_messages` channel still routes through whatever sound was
+  // set when it was first created (system default), so we mint a fresh ID
+  // for the branded sound. Backend FCM payloads target the same ID — see
+  // backend/src/services/notification.service.js.
   static const _channel = AndroidNotificationChannel(
-    'chat_messages',
-    'Chat Messages',
-    description: 'Notifications for incoming chat messages',
+    'halobestie_chat_v1',
+    'Chat HaloBestie',
+    description: 'Notifications for incoming chat messages and extension requests',
     importance: Importance.high,
+    sound: RawResourceAndroidNotificationSound('halobestie_notif'),
   );
 
   static Future<void> initialize(GoRouter router) async {
@@ -64,6 +71,9 @@ class NotificationService {
           channelDescription: _channel.description,
           importance: Importance.high,
           priority: Priority.high,
+          // API 26+ ignores this in favor of the channel's sound; included for
+          // the API 24/25 path where channels don't exist yet.
+          sound: const RawResourceAndroidNotificationSound('halobestie_notif'),
         ),
         iOS: const DarwinNotificationDetails(
           presentAlert: true,
@@ -106,6 +116,7 @@ class NotificationService {
           priority: Priority.high,
           playSound: true,
           enableVibration: true,
+          sound: const RawResourceAndroidNotificationSound('halobestie_notif'),
         ),
         iOS: const DarwinNotificationDetails(
           presentAlert: true,