I applied online. The process took 2 weeks. I interviewed at Booking.com (Singapur) in Jun 2016
Interview
Basically you have to go through 3 steps of Interview
1) Online Interview - whereby you put in your details through online, answer their language tests, etc.
2) Phone Interview - whereby they will contact you on a scheduled timing basis (30mins approx.)
3) Face-to-face Interview
So basically they bring all the interviewees to a room for a presentation slide about Booking.com. After which they will request you to take another language test via the computer (multiple choice)
After you've passed the test, they will interview you individually - if you are interviewing for an additional language, they will have that person to interview you whether through the phone or in that language.
Interview questions [1]
Question 1
Tell me about your recent customer experiences that you have encountered. (in japanese)