Depending on how you provide the data for to the game, that doesn't sound too difficult. Just make sure the contractor knows how to make it look (provide graph

Depending on how you provide the data for to the game, that doesn't sound too difficult. Just make sure the contractor knows how to make it look (provide graphical assets and whatnot), and also how you will be supplying the level information (hardcoding values is never the way for quiz style games, I would decide on a format to go by for providing the data). From there, just check up periodically on them and see how the app is doing. I'd create a private GitHub page for them to commit to and then build and test the app nightly to make sure everything is going well before they build or finish a feature.