I was interviewed by a recruiter and a hiring manager. The recruiter was quite nice but the HM was quite a sourpuss. Her questions did not aim at either know-how, expertise, or proficiency of the posted job.

It's a long interview process, was not fully supported by recruitment in terms of preparation (in my experience, as other companies prepare you more). However, the hiring managers asked very relevant and good questions, same with the case study. Overall an OK positive experience, even if I was not successful.