I am concentrating on the webrtc project and have full stack tech in webrtc. In the frontend: react.js react-native, android native app, In the backend: nodejs, java, c++. media server: suck like kurento janus jitsi mediasoup and so on. and the expert for bigbluebutton. I have a huge experience in VOIP project, Have worked in a big company in VOIP project over five years.