I applied via a referral from a friend who works for Red Hat. Process began with a brief discussion over the phone with the hiring manager, then another phone conversation with some of their engineers. After that, they sent me a test to complete. First part was 12 support case questions, and the second half was 5 programming tasks. They explained that I would have 24 hours to complete it, and scheduled sending it to me once I was ready to begin. The test explained that they were looking for quality over quantity, and to answer as many as I can. I answered 9 of the 12 support questions, and completed 4 of the 5 programming tasks. I heard back after 2 days that I did well, and was given an offer about a week later.