I interviewed for a developer position in Cambridge (UK). The on-site interview consisted of 4 rounds, each with different people -- engineers and managers. Each interview lasted about an hour and was divided equally between behavioural questions (based on the company's so-called "leadership principals") and a technical problem that I had to solve on a whiteboard. One of the technical questions revolved around system design, the rest were typical programming / algorithmic problems one would expect at software engineering interviews. My overall experience was neutral toward slightly negative. While about half of the interviewers were really friendly and approachable, the others came across as arrogant or bored. In the end I did not get an offer, but even if I did, I'm not entirely convinced that I would have wanted to work with some of the people I met throughout the process.