If you want a comparable experience, assign a difficult task to one of your developers, then tell them: "I am going to watch you solve this problem. Talk me thr

If you want a comparable experience, assign a difficult task to one of your developers, then tell them: "I am going to watch you solve this problem. Talk me through it as you do so. I'll judge the result, if its not good enough I will have to fire you on the spot. Also this is timed. Proceed."