Develop WebRTC video conferencing with screen share and speech to text features

I'm looking for a web developer to develop a WebRTC video conferencing application with screen share and speech to text features. I want developer to use Mediasoup library, but I am open if developer can suggest any other library. Latency with 50 participant is the key success factor of that development. Bidder should have deep knowledge on WebRTC technologies and experiences.UI design is not the first thing that I will focus but application performance is much more important. I will need waiting lobby implementation and allowing participants to attend, screen sharing, text messaging, audio and video controls and speech to text (In English) features. Frontend development will be done by ReactJS