After you have had seven cups of coffee from The Roost, you can get a part time job by talking to Brewster while standing at the right side of the bar. The part time job is a mini-game where you must serve coffee to villagers and special characters. Typically, three villagers (not always from your town) will ask for coffee, Each animal has a preferred combination of coffee beans, milk, and sugar. If you make the customers happy, Brewster will reward you with coffee beans to take home, as well as rare furniture items. If you do well over time, your rewards get better and better until you get a rare set of Brewster gyroids. Here is a list of the rewards that you can receive.