Real-Time Service App Development

I'm looking for an experienced Android application developer to create a real-time service request and offer application. The app should facilitate interactions between users, similar to Uber, but for various services.

Key features include:
- Service request and offer functionality
- User ratings and reviews
- Real-time chat between users
- Uber-style search based on ratings and response times
- In-app voice calls for some services
- Biometric authentication (fingerprint/face recognition)

Ideal candidates should have:
- Proven experience in Android app development
- Strong understanding of real-time communication and data synchronization
- Experience with biometric authentication integration
- UI/UX design skills for a user-friendly interface
- Ability to implement secure and scalable backend services

Please provide examples of similar work done and a rough timeline for completion.