You are in wrong forum, this community not for searching app developer.
But If you still looking a app development company then I will recommend WillowTree and Appster is the best android app development company as per my own experience. I worked with each company and they provided great services on time. However if you're looking another android app development agency or company then check this blog post:- http://www.websurfmedia.com/trusted-mobile-app-development-companies-2017/
I hope it'll help you.