Hello, here is our portfolio http://meliorgames.com. Our company is providing highly professional business app and game development services for iOS/Android. In our portfolio there are only our own games presented however the major part of our work are outsource projects (business apps and games) that are closed for review due to signed NDA, though we can provide you with the common idea of technologies used. We have rich experience in developing applications of different complexity for more than 5 years already and there are highly qualified and talented experts with corresponding education and passion to build quality software in our team. We have experience and skills for building a proof concept for a chat program. The bid will surely have to be updated when we know the details of the project. So far it is our average price for week ($25-30 per hour). If you are interested in cooperation, please contact us we will discuss the details. We will be waiting for your reply. Thanks. Best regards