Had a HackerRank, didn't think I'd done too well but managed to get an interview. Had 2 standard technical interviews, a tour while they decided on whether I should have 2 further interviews, then I had the 2 further interviews that were less technical but still about software and my technical interests and to get an idea about the kind of team I'd want to work with.

The first stage is an online hackerrank testing technical knowledge. The second stage is a day on-site involving four interviews and a free lunch, and plenty of opportunities to talk to current staff