Mobile Chat Application (Android)

I'm looking for a freelancer who can build chat application.
App must include :
1. Chatrooms.
2. 1 on 1 chat
3. Audio/Video Calling
4. Gifts
5. File sharing
6. Audio streaming (play music in chatroom)
For example check this App :
Check out "Kik — Messaging & Chat App"
https://play.google.com/store/apps/details?id=kik.android