I was first in contact with recruiters from the US, and then passed onto the London office subsequently. Before going to a interview onsite at the London office I first had 4 phone interviews.

I had behavioral interviews and then 4 in person interviews. The behavioral was straightforward. There was also a data query interview where they taught you a new "language" and had you execute basic queries in it. Then there was a system design interview. I had two of these. The last one they asked me if I was deployed to the moon to identify new species of alien what kind of system would I build.