The interview process was streamlined. Referral through an existing Microsoft employee lead to a Microsoft recruiter reaching out on linked in. Followed by a phone screening interview and then an onsite interview loop which had 4 sessions. The onsite loop interview was getting more difficult as you pass one interview and move on to the next. The last interview session will only happen if all of your previous 3 interviewers gave you a recommendation to hire. The lunch interview is meant to be less formal, but have a healthy and hearty breakfast since you wouldn't be able to eat while the interviewer continues to ask questions.