I had a programming test first on Codility. This was hard (programming flood fill more or less, I did it in Python, but the time pressure is very stressful - be prepared to swear). I got through to the on-site interviews which they paid for (I had to travel internationally). I had 4 interviews in the day, the first was an overview of my experience and went very well, it was just a really nice discussion. The second was regarding my programming experience and discussing projects I had implemented this also went well. The third was more technical, with some questions about threads and program design. This I struggled a little on as whilst I am familiar with the theory, full implementation of parallelisation is quite rare in Python. The fourth was on solving some algorithm problems. I struggled on the last problem, converting numbers to written numbers i.e. "100" to "One Hundred" and all the complexities of this. This one interview went slightly badly (and the interviewers were much more hostile) and unfortunately this overrode all other interviews.

I had a first phone screen, which was an hour long, had 15 minutes of Hr questions based on Leadership Principles, then 45 minutes of real-time coding problems, You need to know a bit much about DSA to be able to pass the coding challenges, you must think out loud.