Booking.com Developer interview questions

First a couple of phone calls with maybe 30 min of duration, then a technical test with about 3 hours and then the interview. Fast interview with a panel of 3 members, it took 1h and half total.

There was first a phone technical interview with two medium questions. The first one was to find if two words can form another word from a dictionary and the second one to get a list of files from a file system hierarchy. Afterwards I was invited to a onsite 3-round of interviews. The first one was coding a solution to the problem described below, the second a system design session to discuss the ways to create a Booking feature and the last one with a team leader about cultural fit.