I applied through an employee referral. The process took 4 weeks. I interviewed at Wonder Workshop (San Mateo, CA) in Oct 2016
Interview
Two phone interviews, followed by a 4-5 hour onsite interview at HQ in San Mateo, CA. Phone screens didn't have anything unexpected, and onsite interview was pretty typical (1:1 interviews with team members discussing coding questions, prior experience, and time for Q&A)
Interview questions [1]
Question 1
Lots of coding questions, and some questions on hardware knowledge, including a few questions on microcontroller I/O, circuit construction.