I was invited for 3 rounds of interviews. The first was mainly about explaining the company and what Magnus is doing. Second interview was mostly about why I wanted to make the change and what I wanted to learn. Last interview was with senior management to see the fit with the firm and estimate whether the role would suit me. I did not get a case study but I heard from other consultants that they do get case studies sometimes. I was very happy with the interview process, as it didn't feel like an interrogation but rather like finding the true fit between employer and employee.