Mobile app developer to build app functionality

We are a marketing agency looking for a mobile app developer. We will give you all of the designs in xcode. You just need to do the functionality. The app will have the following criteria: 1.) app can take videos 2.) app can upload photo with a text caption 3.) app can upload text comments 4.) app will post video/photo/text on multiple sites app needs to interact with apis on the following: company site and sites such as [login to view URL] to upload content such as: text comments /media (photos, video) 5.) apps needs to post updates on: facebook, twitter, google+, linkedin 6.) app will have an online hub that it needs to push/store all date on. 7.) app needs to generate coupon codes/qr codes - unique ones per person 8.) app will allow people to start an account with name, email, password 9.) we will build app for all devices iphone/ipad/android - it has to be compatible that it can work on all. please send me urls to apps you have developed on itunes or google play - we will not look at your application if you do not submit these. This is a fixed price project. We do not pay hourly, and we do not do upfront payments.