It was a thorough interview, but not very professional recruiter. Interviewed several times with them. Once the recruiter never called. The questions were not hard - typical cs questions. The conversation was friendly.

First, there was the phone interview. Then, I was invited to an orientation of sorts - A group of about six people were brought into a conference room and we were given snacks and a presentation about the business. Then, a tour of the building. Next, we were herded into a room with computers and we all had to complete a simple English test. Lastly, the individual interview - I was brought into a room with who would be my future Team Lead and another member of management. One guy, my future team lead, asked the questions and one guy had a laptop to record my answers. The questions were really standard interview questions, but the weird thing? I felt this strange need to be "cool" that I've never had in an interview before. I hadn't felt that way since high school. Booking.com is a very young company - very millennial. My advice to someone trying to get hired here: Have good answers, but hold yourself well. Fitting into the work environment is very important here.