Probably one of the best engineering interview processes I've had. Very little whiteboarding; it was mostly 2-on-1 hour long sessions where I was asked about my work ethic, C++ knowledge, or to discuss previous work. Questions were generally open-ended and a platform for lengthy discussion. The most technical part was a take-home "bug hunt", where I was given some faulty C++ code prior to the interview and asked to identify issues and suggest solutions. We spent the first 1 - 1.5 hours discussing the code and my changes. The turnaround was also very quick; I had an offer the day after I interviewed.