One-hour in-office interview. There weren't any behavioural questions to speak of, the entire interview was solving small coding problems in C. They had a bunch of skeleton files set up, and you could choose which problems you wanted to solve. The interviewers were friendly, but blunt. They were willing to give hints if I got stuck. They were understanding of the high-pressure environment of an interview and seemed lenient towards minor mistakes. Seemed more interested in how you solve problems rather than whether you get them right immediately. A fairly casual interview.