Collaborative Whiteboard with Videoconference, Group Chat, ScreenShare and Host Controls

I am looking for someone who can develop a Collaborative Whiteboard with Videoconference, Group Chat ScreenShare and Host Controls. It should be compatible with Android app and also the Apple App. The website that collaborative whiteboard needs to be implemented on, has backend built on Ruby On Rails and Front End on AngularJS. The website is already hosted on Amazon server.