Flutter app expert required for a long term project

Looking for a flutter and firebase expert to build a language learning app for android and iOS. We already have UI/UX mockups.

Screen details:
1. Splash screen
2. Sign up/Login screen
3. Video lesson category screen
4. Video lesson play screen
5. Profile screen
6. Payment plan screen

APIs to be used: Pronunciation scoring

Other add-ons to be used: Mixpanel, Onesignal

Please apply only if you have experience of building apps in flutter and firebase. Include active links to such apps in the proposal.