Hi Mate,
We are expert in iPhone & Android development, we worked on ecommerce,chatting,map feature,payment integration and social event app too, we build new and do changes in existing app as need.
I have 7+ yr experienced in Android & iOS development and utilize the Xcode & android studio environment.
Will help you to build best program in right way in professionalism & standard coding structure.
It would be greate if we discuss detail in chat.
Thanks
Peter