Personally, I’d love this system (I immediately thought of some code snippets I’d bring!), but I’m curious how you’d handle candidates without any open source projects or contributions who still have a substantial employment history but are unable to show any code from that because it’s all proprietary.
It never happened–since they knew in advance, they had time to whip up something cool if there wasn’t anything else. It didn’t have to be massive. I just wanted to see some clean non-trivial code and a clear understanding of how it worked. Fizzbuzz wouldn’t have impressed. :)