For initial screening, HR called and scheduled a first round of interview with the manager. And for the second round, manager has called in Teams meeting and had a discussion for 30 mins. Third round was manager and another person from the team interviewed for 1 hour. Fourth round was a fitment interview with the manager's manager and was for 1 hour. This happened right before Christmas and they said they will get back to me. Overall interviews went fine but no one has got back to me whether I made it to the next round or not. I reached out to the HR and manager a few times but there was no response. It was unprofessional from Lam Research team to not provide a response after I spent good amount of time in the interviews.