There was a brief phone interview/screening where I answered basics: my degree and how my skills fit into the work, what the job was like, what the next steps in the interview process would be/when I would be contacted next. Then I was emailed in 1-2 weeks to come to the plant for a tour and in-person interview. I met with 3-4 people from the company directly related to the position I would be in. It was pretty free-form in terms of questions, and they tried to get to know me personally while assessing the mutual fit between me and the company. Really nice people and awesome environment.