Quick code assessment, followed by screening call with a recruiter, followed by phone interview with two team members. The recruiter tries to anticipate what might be a challenge for you in the next round, and how to prepare. I was asked to present 3 ideas to improve the site, which seems like a lot for an interview. Seemed like I was doing well through the whole process until I received a rejection email after the phone interview. The reasons given for the rejection were a little vague and not reflective (in my opinion) of the work I presented. It was also surprising, given that the interviewers complimented my ideas as well as my technical ability. It gave the impression that they were just fishing for ideas to improve the site. I wouldn't be surprised to find the ideas I presented being implemented.

First was a simple test on HackerRank, followed by a phone interview with two employees. During that interview, there was another simple online test in real time. Just basic HTML & CSS. Easy. About a week later I got invited to Amsterdam for an in-person interview. HR manager was very helpful and friendly and assisted during the entire time, gave some valuable bits of advice about the interview process. I was asked to prepare 3 things I'd change on the Booking.com website, why and how I would measure the results. They booked the flights and hotel room for me. All was smooth and well organized. The interview was divided into 3 rounds with different employees. One technical, second more focused on your ability to think and solve problems, and the final one with lead designer. Everybody who I met at Booking.com during my visit was friendly and nice people.