I applied online. The process took 6 weeks. I interviewed at Iron.io (San Francisco, CA) in Feb 2016
Interview
Had an initial video technical video screening with two other devops, followed by a half day of onsite interviews. Followed up by an additional onsite and an additional online video screen. This went on over five weeks.
Interview questions [1]
Question 1
What do you do when a directory has too many files to do an ls(1).