YES DANIEL I CAN DO THIS.
I is new user on this the platform of job.
But i have very long expirience. My personal choice ActionScript3 + AIR + Native SDK ( java, object-c, etc ). This synergy open to avialable one programm core (you app) publication together on some platforms. Is crossplatform technology, so, as I see it, very great! Minimal time development and bugfix. i proposal peer-to-peer connection as well (free hispeed connection type device-device / device-room and etc). Of course there are some limitations and the server is still necessary, but most of the load just removed. To my way of thinking, if sending content, calling and ect on the line, without stream-hostserver, and it free technology - it best which can be.
I have a little trouble on speak English, but i understand all. If you search best of the best, it I. Please talk to me, you never regret.
I very sorry with expirience before developers on this project.
At what stage is the product? Maybe fast forward to crossplatform and catch up the lost time?
If you are my proposal interested, I can do demo chat-version (p2p) avialable on Android, IPad, IPhone, Windows, Mac and you feel benefit.
I would be happy to work with you
Best regards, Alexandr