I applied through a recruiter. The process took 1+ week. I interviewed at Open Book Ben (Denver, CO) in Nov 2014
Interview
It seemed thorough in it's execution - and in my experience the thoroughness of an interview is directly proportional to the level of pain that a company has experienced. It was engaging in that I met with all levels of leadership within the organization. It was demanding in that I put several days of development into an ultimately fruitless effort.
Interview questions [1]
Question 1
They requested a submitted code demo implementation using AngularJS, RestAngular, and a public API of my choice, and a full interface implementation of my choice.