2 Skype calls, with algorithms and large scale design questions.
Four on site interviews, one with the group manager with lots of behavioural questions, another 3 with different team members from the teams that you could join, these 3 were mix algorithms questions, technical questions.
Overall the experience was positive, with couple of negative points.
Some interviewers haven't looked at my cv before the interview. Some questions were kind of show off from the interviewer, like do u know "Some topic" that he knows or have read about, and then he talks about it for a while.
And i guess from the feedback i got that the interviewers based their judgment comparing with them and what they know and what they read about, not based on the job requirements and the skills required.