I applied online. The process took 3 months. I interviewed at Abengoa (Lakewood, CO) in Sept 2010
Interview
One person was noticeably disinterested in speaking with me. the hiring process is arduous to say the least. it took three months to tie things up from the first interview. I had to take psychological tests and mechanical aptitude tests and have them evaluated.
Interview questions [1]
Question 1
I don't recall the most difficult question - that was four and a half years ago.