Is a countdown in any way related to your business? I don't think a countdown is a bad way to start, but it is probably a bit basic. I'd get them to do someth

Is a countdown in any way related to your business? I don't think a countdown is a bad way to start, but it is probably a bit basic. I'd get them to do something that shows a level of understanding of OOP. Maybe just expand on the countdown. Can they build a clock which would countdown, then countup either at the click of a button or if it reached a certain digit? Can they reset the clock, pause it?? Those sorts of things. I think any programmer worth their weight should be able to do that in 30 minutes. In fact, I'm going to give it a try right now and see how long it takes.