I applied online. They sent me a HackerRank link with one coding question and a 9-question multiple-choice questionnaire about machine learning topics.
The coding question was the "top k hotels" question, but in the LeetCode example, there are no punctuation marks in the input. So, you need to carefully read the question. It seems the same as the one you can find with a Google search, but with a small trick.
Top k hotels HackerRank
The following metrics were computed from 4 interview experiences for the Booking.com Machine Learning Engineer role in Amsterdam, Netherlands.
Booking.com's interview process for their Machine Learning Engineer roles in Amsterdam, Netherlands is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Booking.com's Machine Learning Engineer interview process in Amsterdam, Netherlands.