Booking.com Software Engineer interview questions

The interview process consisted in three steps. The first was an online test in hackerrank.com. The test were four problems to solve in any language I like. I selected Scala. These excercises were not dificult but I lose lot of precious time dealing with the input-ouput because I rarelly use that in my routine work. I didn't finish all the excercises completelly because two of them didn't pass all the test cases. The second was a call interview with two booking software developers using a web notepad in which they could see what I was writing. They proposed an excercise of grouping words from a list parameter with some additions. Nothing much complicated. After that they asked me what happens if the parameter was an iterable instead of a list and I cannot convert it to a list in my code, and what was the impact in my solution. Finally, passing the previous tests, I was invited to go to Amsterdam to a face to face interview. In Amsterdam I had three face to face interviews, two technical and one about talk from my job experience. The technical interviews were one about model designing and other about algorithms. The questions level was between moderate and hard for my point of view. After that they told me that in two weeks would have an offer for me. They didn't contact me from that. After one month I wrote to my recruiter but he didn't reply. I wrote again after two months but also without answer. I don't know if I didn't pass the selection process and what was my failures because they never gave me the final answer.

Applied online, solved HackerRank problems. Then had skype technical interview. And then I was invited to on-site final interview. In 2-3 days after I received an offer. Overall everything went very smooth with no major issues.