Create an iOS game

I am looking to build a small team of Objective-C/iOS developers to assist me in the development of a children iOS game. 1) main menu to select game mode (game mode must be built modular for easy expansion of new mode) 2) Game with character showing an item 3) player has to trace the alphabet of the item 4) when we detect correct tracing, player will win that level with a 3-star rating system 5) As player traced more words, he will gain achievements 6) The list of words must be able to retrieve from an .txt file The game has to be be ready for iPhone 4, 4s, 5 and iPad Code quality is important and you must be able to use Git effectively. Project requirements: - Git - Cocos2D - Objective C/Xcode - Game Center achievements - Game center leaderboard Please include your experience in the above technologies in your application.