I have been working at Exponent full-time
Great people; interesting projects; flexible schedule
Hard to move up in the company if you are not an engineer.
I applied online. The process took 4+ weeks. I interviewed at Exponent (Chicago, IL) in October 2017.
There are several rounds of interviews, you have to first pass a video interview, which is a more personality analysis. Then they would invite you to a face to face interview. You have to be interviewed by a recruiter who is in your field. After that you would proceed to present your area of research to a panel.