It was a one-shot interview for about 45 minutes - 1 hour, where they asked interviewee to prepare a case study beforehand and present them the result. The preparation time was ~3 hours (it was more than that in reality). Interview began with friendly introduction then the case study. The interviewer were asking pretty technical questions related to the case study, more about how we came up with the approach. It was relatively average difficulty for experienced candidates, but could be somewhat hard for those without prior experience.

Came in for an interview in the head office to speak with the manager of the team. He first asked a bit about my experience, then asked more specific questions about the role, and then went in to the role itself, finishing by outlining the next steps.