Android/Iphone Application

i require a developer to create an app for me on both the iphone and the android. The app will have social media features, sign in with facebook and user sign in, twitter, users must sign up with username and password, one account per phone. This app will be a marketplace where people can post, and review each other. Similiar to freelancer in a way, will require service and support. Uses google maps. Design will be up to you. The concept is simple and project will be to for the right developer