App using google maps

Looking for a good coder to produce one app for company marketing. will basicly work like this: advertising user: register account (email and number and name only) with verification. be able to post deals on their store using adresses in google maps. be able to tag friends with facebook that are in this exact position at this time also showing miniature-pictures of the persons. user: be able to open the app and see a a localmap where the different deals are marked with etc a flag on the map. be able to click this flag for information and also to put comments inside it (questions). everything should be working together with facebook. This app will be needed for both iphone and android users. Happy bidding.