React to Flutter Chat App Conversion

I'm looking for a professional Flutter developer to convert my existing React chat application into a Flutter app. The app should be compatible with both iOS and Android platforms. The ultimate goal is to replicate every feature of the chat app in this conversion, with a particular emphasis on:

- Real-time messaging
- Push notifications
- User authentication

While there are no immediate plans to introduce new features, potential enhancements such as voice and video calling, file sharing, and chat themes/customization may be considered down the line.

Ideal candidates should have:

- Extensive experience with cross-platform app development using Flutter
- Strong understanding of converting apps from React to Flutter
- Proven track record of implementing features like real-time messaging and push notifications
- Excellent skills in user authentication systems

Please provide examples of similar projects you've completed in your proposal.