I applied online. The process took 3 weeks.

After CV screening I was invited to do a timed HackerRank task (124 minutes). There were three questions;

• They weren't too hard, but the requirements for each were pretty long, and it was relatively challenging to get them all done in the time required.
• I used up every minute.
• I'm pretty certain there was a problem with the test cases for one of the questions, which meant that valid outputs were being counted as invalid.

This was a pity. (There's a chance I'm wrong about this, of course!) I didn't progress to the next stage. I asked for feedback on the HackerRank test and actually got some back, which I very much appreciated.

Just some file-processing questions, and a more logic-based question.