The overall process took about three weeks. I interviewed at MKS Instruments (Milpitas, CA) in Sept. 2021. Contacted by recruiter. She is very nice, effective, energized, and with patience. Introduced the position, company, standard benefits, etc. Very great experience communicating with her during the whole interview process. 2nd round was 4 hours panel interview with 8 staffs (Microsoft Team Video) including five engineers, manager, senior director, and HR manager, etc. I must say all those MKS interview team members are very amiable, knowledgeable, and professional. They asked me great questions, and left time for me to ask them questions as well. I had very good time during the process. Although I declined the offer for personal reason one week later, I was impressed by the MKS Milpitas team. I'll be very happy working with them if there is chance in the future.