I applied through an employee referral. The process took 1 week. I interviewed at Oregon State University (Corvallis, OR) in Aug 2017
Interview
It was pretty chill, I talked to a professor that I'd taken a class with and I'd done well in it so she told me I should apply. So I sent in my application so it would be official and then I had a short interview with the professor who was teaching it that term. I feel like it was more of a formality than anything.
I applied in-person. The process took 3 months. I interviewed at Oregon State University (Corvallis, OR) in Dec 2015
Interview
I performed beyond the remainder of the class I was in, in addition to taking a strong interest in the final project which must have gotten me noticed. There wasn't much beyond this, the professor for the class offered me the position for the following quarter and I accepted.
Interview questions [1]
Question 1
Effectively the entire upper division/grad class was the interview.