diff --git a/README.md b/README.md
index d2498b95..9307fd02 100644
--- a/README.md
+++ b/README.md
@@ -101,3 +101,24 @@ To build all apps and packages, run the following command:
 cd my-turborepo
 yarn build
 ```
+
+## Dart Package development
+
+First, get the specific dart container up by running:
+```sh
+docker compose up -d dart
+```
+The genereal docker compose won't launch the dart service.
+
+then, once the container is up, run:
+```sh
+docker exec -it dart-defindex bash
+```
+Then you can launch the example app by running:
+```sh
+cd example
+flutter run -d web-server --web-port 8080 --web-hostname 0.0.0.0
+```
+This will launch the example app on the port 8080 of your localhost. so you can go to
+`http://localhost:8080` to see the app.
+
diff --git a/docker-compose.yml b/docker-compose.yml
index 748ff77c..9d939112 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -27,6 +27,8 @@ services:
   dart:
     image: ghcr.io/cirruslabs/flutter:3.24.4
     container_name: dart-defindex
+    profiles:
+      - on-demand
     networks:
       - defindex-network
     volumes:
diff --git a/packages/defindex-dart-sdk/example/lib/main.dart b/packages/defindex-dart-sdk/example/lib/main.dart
index 4766e23b..a12dee4c 100644
--- a/packages/defindex-dart-sdk/example/lib/main.dart
+++ b/packages/defindex-dart-sdk/example/lib/main.dart
@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:defindex/defindex.dart';
+import 'package:stellar_flutter_sdk/stellar_flutter_sdk.dart';
 
 void main() {
   runApp(const MyApp());
@@ -50,7 +51,7 @@ class _MyHomePageState extends State<MyHomePage> {
       String? transactionHash = await defiIndex.deposit(
         'GCW36WQUHJASZVNFIIL7VZQWL6Q72XT6TAU6N3XMFGTLSNE2L7LMJNWT',
         100.0,
-        (transaction) async => 'your_signed_transaction',
+        (transaction) async => signerFunction(transaction),
       );
 
       print('Transaction hash: $transactionHash');
@@ -99,3 +100,31 @@ class _MyHomePageState extends State<MyHomePage> {
     );
   }
 }
+
+// Future<String> signerFunction(String transactionString) async {
+//   // Decode the transaction from the base64 string
+//   final transaction = Transaction.fromEnvelopeXdrBase64(transactionString);
+
+//   // Create KeyPair from the user's secret seed
+//   KeyPair keyPair = KeyPair.fromSecretSeed('your_secret_key');
+
+//   // Sign the transaction with the KeyPair
+//   transaction.sign(keyPair, Network.TESTNET);
+
+//   // Return the signed transaction as a base64 string
+//   return transaction.toEnvelopeXdrBase64();
+// }
+
+String signerFunction(String transactionXdr) {
+  // Create transaction from XDR
+  AbstractTransaction transaction = AbstractTransaction.fromEnvelopeXdrString(
+    transactionXdr,
+  );
+  
+  // Create keypair and sign
+  KeyPair keyPair = KeyPair.fromSecretSeed("SC352W6PEHWSHYKP5IYO3HWAEVGLTVLZW5WE3UXPWSGKBST5K6DKRT7F");
+  transaction.sign(keyPair, Network.TESTNET);
+  
+  // Return signed XDR
+  return transaction.toEnvelopeXdrBase64();
+}
\ No newline at end of file
diff --git a/packages/defindex-dart-sdk/example/pubspec.lock b/packages/defindex-dart-sdk/example/pubspec.lock
index ce226da5..c831dafd 100644
--- a/packages/defindex-dart-sdk/example/pubspec.lock
+++ b/packages/defindex-dart-sdk/example/pubspec.lock
@@ -280,7 +280,7 @@ packages:
     source: hosted
     version: "1.11.1"
   stellar_flutter_sdk:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: stellar_flutter_sdk
       sha256: a25506529d40a040227cd565de6e1b4cc0a9ffc756472cf3c43420512e8a269b
diff --git a/packages/defindex-dart-sdk/example/pubspec.yaml b/packages/defindex-dart-sdk/example/pubspec.yaml
index 8f46febc..912d0014 100644
--- a/packages/defindex-dart-sdk/example/pubspec.yaml
+++ b/packages/defindex-dart-sdk/example/pubspec.yaml
@@ -32,6 +32,7 @@ dependencies:
     sdk: flutter
   defindex:
     path: ../
+  stellar_flutter_sdk: ^1.8.9
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.