Development of an Uber type app for iPhone/Android

Development of an Uber type app but not for car rides. The application must look for the closet available person and corresponding provider to match them. The app must allow for rating them just like Uber. The user must be able to enter credit card details before selection. This app needs to work on iPhone and Androids. A secure backend SaaS/DB server (prefer Amazon AWS but suggestions welcomed) must be created as well to store user/provider information, ratings, credit cards, etc. This whole application/backend will need to work exactly like Uber.