This is a fair point. I make a point of not asking "CS exam" questions, but I do expect candidates to be familiar with fairly common computer science concepts.

This is a fair point. I make a point of not asking "CS exam" questions, but I do expect candidates to be familiar with fairly common computer science concepts. (Not-an-Example: In my own interviews I was asked about things like O-notation, and I have run into many, many programmers who don't know what this is.) I think a question talking about the Django templating system when the interviewee mentions they use Django is fair game, though; and questions that revolve around 'here's a real world problem I want to do with a string, can you write a quick algorithm' are ok, but then I do things like the Greplin programming challenge for fun and I'm not even an engineer =(