RN WebRTC implementation

We are looking for a freelancer who can implement WebRTC into a React Native app([login to view URL]) for us. The app works like this: A user requires to speak with a certain type of person. The app’s operator chooses a time slot. At the set time, a call is triggered between the two people. Right now, we have a terrible Twilio Programmable voice implementation with a lot of silent packets and we would like to move away from that. We don’t know WebRTC enough to build by ourselves. The concrete project: - The call quality is comparable to WhatsApp’s call quality - Trigger a call between two people, when the first person accepts, call the other - Outgoing call from one user to another - Announce a sound into the call (can be implemented locally on both sides) - Cancel any going call from the server side - Notify server side if a user accepts the call, presses busy or doesn’t respond to the call - Implement with Callkit on iOS and something alike on Andriod - Training to maintain the implementation with us Required skills: - WebRTC including TURN server - React Native, Redux - Native iOS and Android