Similar Android App like Appnana, only experts needed!!!

I want a similar app like appnana, where user gets rewarded for tasks what he does in the app, the app has offerwalls wich he get from sites like adworkmedia. only experts needed, i need this app in very fast time, dont send me company portfolio! explain me how you will make that, how much time you need, how much cost. No Amateurs! Only Experienced!