Informal, we went off topic a lot and had casual conversations as well as going through the questions. Also I was given an interview with my two friends who also applied with me and we had a group interview and all three of us got the job. It was very enjoyable but also very strange.

Had to go through several competency-based questions and scenario questions, e.g., what would you do in this scenario, etc. Questions were relatively straight-forward. There was then a paper 'exam' I had to fill out with similar questions, before being asked about my relevant experience and how much time I could commit.