Unfortunately I don't think interviews are a good tool for working out someones suitability. Interviewers have so many biases and pet interests. If you happen

Unfortunately I don't think interviews are a good tool for working out someones suitability. Interviewers have so many biases and pet interests. If you happen start talking about something technical(Some side project using x technology) you both enjoy, you instantly get on, and its great. If start talking about a side project the interviewer has no interest or knowledge in, not so great. It becomes hard work. There is an element of luck about who is interviewing you.