Flutter Frontend/UI Rebuild for Existing Marketplace App

I have an existing marketplace application built in Base44 with a functioning backend, user accounts, listings, messaging, and booking workflows.

I am looking for an experienced Flutter developer to create a modern, native-feeling iOS and Android application that connects to my existing backend rather than rebuilding the entire platform from scratch.

Scope of Work
Build a Flutter frontend using my existing app as the blueprint
Create a polished native UI/UX for iOS and Android
Connect to existing APIs/backend services
Implement:
User authentication
Rider, Host, and Guide profiles
Bike listings
Search and filtering
Booking requests
Messaging
Subscription management
Push notifications
Follow Apple Human Interface Guidelines and Material Design best practices
Optimize performance and navigation for a native mobile experience
Deploy to TestFlight and Google Play Internal Testing
Deliverables
Complete Flutter source code
iOS and Android builds
Documentation for future development
Assistance with App Store submission
Required Experience
Flutter
Firebase
Marketplace applications
Messaging systems
Subscription billing
App Store and Google Play deployment