I’m looking for an experienced Flutter developer to take a complete PropX source code package (already organized and ready to paste) and turn it into a working iOS TestFlight build. The app, PropX, is an AI-powered sports-betting assistant with four tabs (Home, Smart Bets, Ask, and Profile). All UI screens, Riverpod state structure, models, repositories, widgets, and mock/live mode logic are already provided. Your job is to assemble the project, connect Firebase, configure production environment variables, integrate Stripe, deploy the included Firebase Cloud Functions, and publish the app to TestFlight. Responsibilities include reconstructing the Flutter project, pasting in the provided source code, ensuring it compiles in mock mode, running flutterfire configure to generate firebase_options.dart, and enabling Firestore, Auth, Functions, Messaging, Analytics, and Crashlytics. You will set up production environment variables for Stripe, OpenAI, and TheOddsAPI, using the format already included in the instructions. You’ll also configure Stripe Subscriptions using the provided flutter_stripe setup and TypeScript Stripe functions, deploy all Cloud Functions for OpenAI, sports props, and subscriptions, and make sure the app can call them correctly. You must prepare the iOS build by updating bundle IDs, configuring signing and capabilities, setting up push notifications (FCM), and completing any required Stripe or Firebase iOS setup. Once the app is confirmed working in both mock and production modes, you will upload the final build to TestFlight through Xcode and App Store Connect and provide a working TestFlight link. You will receive all the source code in copy-paste format, including the Flutter files, Firebase Functions, assets, and a README that explains mock mode, production mode, and setup steps. The ideal developer has strong Flutter/Dart experience, understands Firebase and TypeScript Cloud Functions, has integrated Stripe in mobile apps before, and is comfortable publishing builds to TestFlight. The final deliverable is a fully functioning, stable TestFlight build of PropX running in production mode.