Small unity game VS play with rankings

I'm looking for someone to create a small, multiplayer Unity game with online capabilities and a ranking system. The game should have multiple players, competitive ladder rankings, and a variety of achievements that can be unlocked. The game should be made for android, ios and html5. Additionally, the ability to customize certain elements (such as character avatars) is a bonus. Ideal features include leaderboard tracking, variable difficulty levels, and the ability to play with friends or find an opponent in real-time. The ranking system should be detailed and fair, and should motivate players to come back and keep playing by rewarding their progress over time. Successful completion of this project will require excellent game design, programming, and integration of existing user rankings/leaderboards.