Quick process with phone interview as the first step and then you need to do a test followed by another interview at the Booking.com office. If you pass, you will contacted for the next interview
I applied online. The process took 2 weeks. I interviewed at Booking.com (Warschau, Masowien) in Jul 2015
Interview
I went through two stages of the interview process. The first one was a general job interview on the phone (I was interviewed by an Amsterdam-based HR representative) and the second one was a translation test in the local office. My overall impression is positive (all employees were extremely nice to me), although the test was long and stressful.
Interview questions [1]
Question 1
What is your preferred salary? (all rather standard questions)