Flutter Developer for iOS Background Geofencing & FCM Push Notifications

About the project We are building a London driving app that alerts drivers the moment they enter the ULEZ or Congestion Charge Zone — even with the phone locked and app closed. The UI is being built in FlutterFlow by the founder. I need a Flutter specialist for the native engine layer only. What you'll build Integrate flutter_background_geolocation into a FlutterFlow project — GPS must run with screen locked and app killed on iOS and Android Write zone crossing detection logic against TfL GeoJSON boundaries (CCZ + ULEZ) Write zone entries to Supabase on crossing and trigger FCM push notification via Edge Function Save FCM token to Supabase, configure APNs key in Firebase for iOS All tested and confirmed working on a real iPhone Stack: Flutter/Dart · FlutterFlow · Supabase · Firebase FCM · flutter_background_geolocation · TfL GeoJSON Timeline: ~4 weeks · Fixed price preferred Requirements — non-negotiable Live App Store or Google Play app with iOS background geofencing that you built — include the link in your proposal or it will not be read Flutter + Dart minimum 2 years FlutterFlow custom actions experience Firebase FCM on iOS (APNs configuration) Supabase or PostgreSQL experience To apply, include in your proposal: App Store / Play Store link showing live background geofencing Which package/approach you used and why Your fixed-price quote for this scope Your earliest start date Proposals without all four will not be considered.