Booking.com Software Engineer interview questions

The whole interview process was great, I really enjoyed it. At first, I received invitation for phone interview and assignment - 4 not difficult tasks for 1 hour. Next stage of interview process was a phone call from HR: he described details of nearest phone interview with IT specialists and other common things and answered all my questions, I told about my skills and experience. Next stage - remote interview with IT specialists. There was 2 not difficult tasks, interviewers watched for coding process live and I described my thoughts and ideas. Next stage was in Amsterdam, Booking.com arranged flights and accommodation. There was 2 rounds of technical questions and 1 business question. Tasks wasn't difficult again, but there was not only 1 solution, interviewers interested in my thoughts and the way I chosed for solution.