I read your job description carefully and interestingly.
I think that I have experiences and knowledge enough in developing mobile app/game.
I have developed many mobile applications with photo/video sharing and social networking(FaceBook, Twitter, linked in and so on), front-end and back-end Web Service, management DataBase(sqlite,..), service based on location using GPS/Google Map, fitness app, audio/video streaming services.
I have been developing mobile app for 6 + years. So I know about fashions and states for almost all kinds of the mobile app in the mobile app market.
I worked with many clients of the world and they liked my working and my results. 100+ apps and 200+ games were developed and approved by my clients and me successfully.
I can make your app perfectly.
Please believe me and contact me to discuss your idea.
I will always work hard to implement all of the requirements so that you can feel contentment with my results.
I will not be contrary to your expectations.
Thank you
Jongwan.