Interviewed with 4 other senior engineers. Primarily showed and discussed side projects and academic project. You should have a portfolio of design items ready. They seem to value personality and ability to learn highly as well as mechanical aptitude.
I applied online. I interviewed at Farm Design (Hollis, NH)
Interview
A few preliminary questions from HR over email, and then soon after a one hour virtual interview with two engineers before an offer. Offer was received only a few days later.
I applied through university. The process took 1 week. I interviewed at Farm Design (Boston, MA) in Mar 2015
Interview
The interview was held at a bar in Boston with 3 employees from Farm who were all engineers. They asked pretty basic questions and asked to see my portfolio.
Interview questions [1]
Question 1
They asked about my past projects during my other two co-ops and what my general thought process was when taking them on.