App designer

We are looking for a designer and coder for an app (android and iphone). This App (extended specs are available) this for shoppers of a department stor. This shop has all kind of co owners (shops). Shoppers get offers from all shops of the department store. The App has a cms back end for all shop owners to upload offers/info. For the shopper its a kind of ad paper (like groupon) with ads/offers. We are looking for a designer and coder. Required is a a great understanding of interaction design and experience in building/designing app. Only respond with a proven track record = you have apps in the marketplace. After reviewing your work, we will provide specs and we can agree on a price.