I applied online. The process took 3 months. I interviewed at Mixpanel (San Francisco, CA) in Mar 2015
Interview
Phone interview and then onsite interview conducted in a panel setting. You will meet the hiring manager, a few individual contributors and then a department head. This process was dragged out for months and ultimately ending in a decline notification without explanation. I'm sure the position was highly competitive but it was a horrendous process that took nearly three months. Would never consider this company again. It isn't any wonder that they are no longer considered a 'hot' startup.
Interview questions [1]
Question 1
Implement this a line of Javascript to make their endpoints monitor your event (use jquery)