Flutter Application Modification Requirement

We are looking for an experienced Flutter developer to build a secure, scalable, and user-friendly mobile application for iOS and Android. The application will be developed as a SaaS-based platform with AI-powered features using OpenAI API integration. The UI/UX design of the application is already completed in Flutter. The primary requirement is to integrate APIs, implement backend connectivity, and make the application fully functional and production-ready. Key Features Required: User authentication (Signup/Login) Firebase integration (Auth, Firestore, Notifications) AI-powered functionalities: Text generation using OpenAI API Image generation using OpenAI API AI chat feature using OpenAI SaaS-based application architecture User management module Tracking of OpenAI token usage per user Subscription plan handling Payment history management (Phase 2) Important Note: The Flutter UI design is already developed and ready. The scope of work is mainly: API integration Business logic implementation Firebase and OpenAI integration Making the app fully functional and live Phase 2 (Future Scope): Payment gateway integration Subscription billing system Advanced analytics and reporting Deliverables: Fully functional Flutter app for iOS & Android Clean, optimized, and well-documented code Proper API and Firebase integrations Fully tested builds Assistance in app deployment Post-launch support (optional) Required Skills: Flutter & Dart Firebase (Auth, Firestore, Cloud Messaging) REST API Integration OpenAI API Integration Mobile UI/UX Implementation State Management (Provider / Bloc / GetX) Estimated Timeline 10 Days