First Solar Development Engineer II interview questions

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.

1. Phone interview with a recruiter 2. On-site interview at First Solar. (Total ~7-8 hours long) 2.1. Research presentation. 2.2. Line tour. 2.3. Interview with different managers. 3. Follow-up from First Solar. 4. Offer letter.