Hello. Please check follow my apps.
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Of course I have a wealth of experience on the Chat App Development field(include sending and receiving Video, Sound, variety files and Location Info).
I have developed chat apps similar whatsapp, snapshot and wechat.
I can complete your task perfectly and smartly.
For completion we need a server that has wide band width.
Of course I can support your own chat server and third party such as Parse, Facebook, Twitter, Amazon, Sinch, Wechat and so on.
I hope to work with you.
If you want I can provide you my app links
Best Regards.