I applied online. The process took 3 months. I interviewed at Fitbit (Boston, MA) in Nov 2015
Interview
These guys are a joke! They ask a lot of elemantary questions and expect you to hop through hoops. For an intern position, maybe - but that is really disrespectful For a seasoned professional, it was too demeaning.
If they were doing some amazing research - I would still delcine to interview further.