Hello
have you considred option of working with a ready team instead of single freelancers? We are a team of exprienced developers from Novosibirsk, Russia. our team has experience in developing different mobile apps. We developed social network apps with chats+ image sharing, geolocation servises and many others. We have expereince in developing for Android and iOS. You can find more info and some examples in our portfolio.
we can offer you fullstack development we have QA, PMs that makes us able to develope high quality code in time.
Also we have design department in our company so we are able to develop the app from A to Z
can you provide more details so we can estimate the job better?