Build Audio-Only Consultancy App

Looking for an experienced full-stack mobile app developer/team to build an audio-only paid consultation app similar to Connecto.

Tech stack preference:

- Flutter frontend
- Node.js + TypeScript backend
- WebRTC P2P audio calling
- Socket.IO
- PostgreSQL
- Redis
- Coturn

Core MVP features:

- OTP authentication
- User & expert profiles
- Expert discovery/listing
- Wallet & recharge system
- Paid audio calls (per-minute billing)
- Ratings & reviews
- Push notifications
- Admin panel

Important requirements:

- Scalable architecture
- Low-cost infrastructure optimization
- Clean production-grade code
- Strong realtime/WebRTC experience
- Experience with payment gateway integration

Please share:

- Relevant portfolio
- Realtime/WebRTC experience
- Estimated timeline
- Team size
- Approximate budget