Android Voice Chat App Development

I'm looking for an experienced developer to create a voice chat application for Android.

Essential features:
- Group chat
- Direct messaging
- Voice message recording

User authentication via email login is required.

Ideal skills and experience:
- Android app development
- Experience with real-time communication features
- Strong knowledge of user authentication systems
- UI/UX design skills for a user-friendly interface

Please provide relevant portfolio examples and estimated timelines.