I'd like to create a mobile app where users can input a badge number. If the number already exists, you get the existing profile, if it doesn't, a new profile

I'd like to create a mobile app where users can input a badge number. If the number already exists, you get the existing profile, if it doesn't, a new profile is created, from which you can upvote or downvote the officer, add a name or picture, and write a review. Other users can upvote or downvote reviews as well. The other part of the app would be a top 10 list of the best officers in NYC, and a top 10 worst officers. I'm pretty alright at Android, but know nothing about iOS. We'd need a really great and simple design. The whole backend could be done with Parse. Anyone interested?