I applied through an employee referral. The process took 1+ week. I interviewed at Red Hat (Raleigh, NC) in Mar 2015
Interview
Met with two managers, somewhat informal, focused on background and culture fit. Asked me questions about my past experience, also asked how I fill difficult opportunities/hire when it's difficult to identify talent. Very conversational interview.
I came into the office and met with two people after a phone screen with the direct hiring manager.
Interview questions [1]
Question 1
They had me white board my process for hiring candidates, very interactive.