Flutter App with Voice Interaction like ChatGPT***

I need a Flutter app for educational purposes, featuring:

- Real-time voice chat
- Text chat
- Document upload

User authentication is not required, and the app should support one language only.

Ideal skills and experience:
- Proficiency in Flutter development
- Experience with real-time communication features
- Familiarity with document upload functionalities
- Strong UI/UX design skills for an intuitive user experience

Please include relevant work in your bids.