All interviews were carried out in English.
Interview process consisted of an initial phone interview with an internal IT recruiter who asked about your experience in general, what sort of projects you work on, and why you were interested in looking for a new position. It was faily non-technical and in the standard Dutch style was very upfront and matter-of-fact. She asked about what my thoughts were on the current booking.com system (which I hadnt looked at and when I did, I was looking at the ipad version and she was talking about the desktop version, so that was awkward) But the recruiter seemed to like it enough and recommended I have a second interview.
Second interview was another phone interview (I live on the other side of the world) with colleagues who hold the same position as the one I was applying for. I was loosely told by the recruiter that I should go through the booking.com booking process and come prepared with feedback and recommendations. I prepared my feedback and documentation. And when it came time to have my interview (the middle of the night for me) they never called. I got an email about 2 hours later stating that they had been stuck in a meeting. Not a problem. I've had this happen to me, too. We rescheduled for the following day. Second day comes and I have the interview. I basically talk for an hour giving my presentation on optimization of a sales funnel, writing personas, defining happy paths, using data to make data driven decisions on optimization. Interviewers say very little in general. My time ends, and they thank me for the talk and we hang up.
A few days later the recruiter calls me again and asks me how it went. I say that I don't really know as I did most of the talking and they did none at all. She says okay and checks their notes. They liked what I had to say and wanted to fly me to The Netherlands for a final interview.
We made arrangements and they were very accommodating. The entire process was very pleasant. I arrived a few days beforehand and explored the city a bit.
I arrived early for my interview and was quickly greeted and made to feel welcome. I was told I would have two interviews and then a final discussion with the HR recruiter.
I was put in a room and was in front of two other sets of peers talking about best practices when it comes to optimization of a sales funnel. We talk about how to get data, how to interpret data, and how to form hypotheses off data. I ask them about what they like about working here, what their day-to-day is like, and what sort of candidate is successful. They are cheery but serious in their answers.
Second interview was with another set of peers and we talk about my past projects and how I used data to make profitable decisions for my clients. We discussed business intelligence, SEO, innovative techniques on data mining, and how it could relate to travel booking. I ask them about their work life, why they came to work for this company, what they did before they worked here, and what they disliked the most about this job. They answered in the same cheery but serious manner
After that, the HR representative came in and told me they wanted to have another interview with either a senior member or the department head. They couldnt raise him via text, so while they went to find him, they took me on a tour of the facility. The HR representative was nice and it was a casual tour which was exactly what I expected it to be. When I returned the department head was there, and we talked. He had a number of scenarios that he wanted to go through involving how to make deductions based on real life scenarios. It was probably the most interesting interview I've ever had. I was not prepared to start practicing statistics on the spot, but I eventually got myself up to speed to successfully answer his questions. I asked him what sort of candidates were successful in this organization and what sort of people he liked to have on his team and what sort of people would wash out quickly.
After that, I had a conversation with the HR recruiter about relocation and logistical questions surrounding moving to a new country. We parted ways and she said she would be in touch.
A few days later we had a phone conversation and she let me know that my lack of experience in one area was why they were not offering me the position. (they were absolutely right about it, by the way) and that she wished me good luck. I would have also picked this area as my weakness based on those interviews, but don't think it would have been a problem to come up to speed on.
Either way, great interview process. Very pleased with the company in general.