Hello. I have been working with Messaging apps for 4 years. (Skype, Whatsapp, WeChat, Telegram, Snapchat)
I have enough experience in this part and i can also support Quickblox, Openfire, Firebase, Ejabbered, Amazon WebService, C2call, Parse, Opentok API etc.
I can easily integrate Text messaging, Sending images and videos, Video/Audio chatting, Group chatting, Secure and Secret mode, Notification services. etc.
Nice and familiar interface will be greatly make you happy.
I promise you nice iOS, Android chatting app with flexible web service.
I will take responsibility for my app and I hope long term partnership with you.
Best Regards