I applied online. The process took 2 months. I interviewed at Blue Origin (Seattle, WA) in Jan 2016
Interview
It was a very elaborate first interview. The tour of the facility was awesome, but the interview after was lackluster. Be prepared to defend every word on your resume. And know every equation and theory from your basic classes. And whatever you do, don't mention SpaceX or Virgin Galactic. Hopefully you can learn from my mistakes, best it luck.
Interview questions [1]
Question 1
Know all your basic physics and materials equations.