There was a brief phone screening with HR, where I was asked to explain my motivation, background, etc.

After that, I had a technical screening interview. As preparation, I received four programming questions (data structures & algorithms) which I needed to submit before the actual interview.

The phone technical screening interview itself was conducted by two software developers who asked two technical questions (which I needed to code in their environment in real-time) and one business-related question.

The last round was an all-day, in-house process with three interviews:

• The first interview was technical, involving the usual tasks like coding a solution for a challenging problem on paper.
• The second was a system design interview. Although it was a system design interview, the interviewers asked me to code some things in the end, which I was happy to do.
• The last interview was with a senior manager and was more of a conversation. I have no doubt that I was evaluated during this chat.

Overall: The people were really nice, and the interview process was smooth. Booking.com was also quite flexible; they changed the interview time when I mentioned I had another competitive offer. A great overall experience!

Guide us through the "auto-complete" feature, first from the system design point of view, then dive into the implementation.