3 rounds. First round with an HR staff. Second round with a single proxy for the hiring manager, who asked me in-depth solar cell physics questions. Third round was on-site. I first had to present a seminar for 35 min. Then, I had 9 one-on-one 30 min interviews with 1h pause for lunch. The lunch hour was shared with some of the staff as well.

Standard STAR questions on collaboration, conflicts, project management etc. Interviewers expect you to know only the basics of the CdTe PV industry and understand that not everyone comes in with the same background. Being well prepared to talk about your own experiences is critical though.