I applied through a recruiter. The process took 4 weeks. I interviewed at Argonne National Laboratory (Chicago, IL) in Mar 2015
Interview
-I got honored with a phone interview/screening after having applied 3 times. They never got back to me. Don't bother applying for the HPC Linux Admins positions. You will never hear back from them!! Seems like any government agency: slow and bureaucratic.
Interview questions [1]
Question 1
-Experience questions with Xcat, Linux and Infiniband and other HPC specific questions.