I applied on their website and got an email from HR asking for a phone interview that would take 30 - 45 minutes. I did the phone interview and then the next day I received confirmation that I could have another interview at their building. The next interview was a 3 hour interview split up into 3 interviews each lasting 45 minutes (Usually lasted longer) with two engineers. I had the option to take a small break after each interview and it ended with a 15 minute HR interview at the end.