Composition App

I am looking for an experienced developer to create an app that aids in composition for photography & film. The app would essentially be a camera/viewfinder app, but with the ability to switch between different aspect ratios & focal lengths (simulated), as well being able to switch between different grid overlays to aid composition. The ability to then take a picture with & without the overlays/effects applied is also desired. There are several much more complex features I would like to add at a later date, dependant on demand/success of the app, so someone who is interested in potential long term collaboration is a plus.