Mobile quiz app with PhoneGap and App Engine

The quiz mobile app allows a user to take a quiz and see how his answers compare to other people who have also taken the quiz. The quiz itself is specified as an XML file bundled with the mobile app locally. The app only uploads the user answers to the server after the quiz and downloads the quiz answer stats from the server before the quiz. The server runs on Google App Engine and only needs to support these two API calls (upload/download), and the mobile client uses PhoneGap. The complete spec is ready and will show to the selected bidder. You must have done PhoneGap and App Engine (Python) projects before, experience is required.