The first interview was with HR for phone screening. The second one was with the direct manager asking why apply this job and why Fluigent. Then I was invited to an on-site interview to present a case study. Questions are based on the presentation. Nothing difficult. The last interview, again, was on-site but with their CFO/HRD but this was the one that I felt insulted. Their HR is very professional but be careful with CFO/HRD!