Update an existing Windows Phone app with new backend services

I'm in need of a ROCKSTAR developer to update a Windows Phone application with a new backend. My app - actually a simple game - is built using a backend as a service product which handles things like user accounts, location based high scores table, etc... That backend is being updated, and so I need to make the appropriate updates in the game. I will also be looking to make any updates necessary to bring the app fully in line with Windows Phone current requirements. It hasn't been updated since WP7.5, so I expect there might be some minor tweaks there. There will be no new functionality required - so I don't have a "spec" or any wire frames for prospective developers to review. The existing app is published and completely downloadable, so responders to this post will get a link to go check out the app to understand the complexity of the project. If this project sounds interesting and up your alley - then I'd love to hear from you. Be sure to respond with a link to other WP apps/games you've built and a description of what your input was to those projects, if you didn't develop them completely. Please respond to this job with the following text in the first line: "I'm a rockstar WP developer", so I can immediately delete spam/bulk responders.