Almost like snapchat with specific features

I need someone to do a snapchat type of application on android, iPhone, iPad, and windows mobile technologies. There will be a few tweeks to this to make it different I need it done completely and installed but own the source files and program so must be from scratch. I know there are programming tutorials to do this so it should not be to expensive must sign nda and be able to complete work from start to implementation to support. I have about 6 features I want added. Must be able to set up server side and application side. Also allow for sponsor features. With a paid option to not have the sponsor feature.