As others have reported, this is an extremely long and difficult interview process. Definitely the toughest I ever encountered. My technical interview took close to 3-4 hours long which I guess is a good thing since they go deeper with the questions if you demonstrate knowledge in a particular area of expertise. I was sweating bullets hoping for it to end, however the interview process prompted me to accept their offer as I was convinced they only want the best and brightest working there and I felt it was the best place to grow a career.