Dear Sir,
I have read the description to create an app that features a game simillar to Reversi (or Othello). I am an experienced Android Developer, and I am fully capable of create the application you describe.
I believe this app can be create in less than 5 days. But by allowing 7 days it assures the final project is clean and performs better.
If you want to see some of the applications I have created, send me a message so we can further discuss things.
Best Regards,
Carlos Machado