Booking.com interview questions

They give you a Hackerrank test (4 questions in 1 hour 15 minutes), then the HR calls you, and then there is the live coding, where 2 programmers watch you coding while on call. The code doesn't have to compile, they are only interested in the algorithm. I got an easy question, but as I haven't solved any problems of this type, I couldn't provide them the most optimal solution other than a brute force one. I think you either have luck, by knowing the problem type, or you learn a lot of algorithms, or you are a genius and come up with a solution in place. It's also hard to think in place, while you know that 2 others are on the line.

Phone interview with HR, the call lasts about 15 minutes. Several questions about background and past experiences related to data analysis. Two questions about future plans. Ended with me asking questions about the role, length of projects etc. The graduate programme is an one-year programme including two half-year rotations with different groups (data scientists, business team etc.) in Booking. The average length of the project is about one-month. The interviewer said the position is really competitive and the result for my interview came out in the next two days.