I had two interviews. One of them was based on experience from my CV, and the other was more of an explanation of what I might be working on if I got an offer. So really, it was just one interview. There weren't any technical questions at all, just questions about my CV.

The interview was held in their main offices in Bath in one of their meeting rooms. It lasted 3-4 hours in total. The first part of the interview was rather relaxed and was mostly based on questions about the CV. The two Netcraft employees interviewing me then proceed to ask me to solve some not too challenging network security problems. After this two younger Netcraft employees presented some of the company's products. This was also part of the interview as they asked questions about how I would have proceeded to build certain things they had made. Finally, I believe after making the decision of whether or not to give me an offer, the CEO of the company came into the room for a quick general discussion.