I applied through an employee referral. The process took 3 months. I interviewed at NASA Jet Propulsion Laboratory (Pasadena, CA) in Apr 2016
Interview
I had to give an hour long research talk, and had individual meetings with group members. The interview process was pretty relaxed, but long (I was there the entire day).
Interview questions [1]
Question 1
I was given a problem and had to solve it on the white board.