I sent my CV and cover letter. About 2 weeks later I've been contacted by them for a brief administrative call interview. They day after I received an email asking for a face to face interview in Leiden with the department managers.

First there was a questionnaire designed to assess understanding of a subject matter. In this case it was related to sustainability. This was followed up with a phone interview. Following the phone interview, there was an in-person interview with two people. The interview process was exclusively behavioral. They wanted to assure skill-set fit. We spoke mostly about details of the specific project oriented work and my credentials that made me a good candidate. They also asked me questions that seemed to test my character, such as whether I was genuine. It was very Midwestern.