it was easy and friendly and it took like 1 hour. we talked about the job and my background. also we discussed future opportunities. what would be next role, and we also talked about my chances of getting accepted.

Easy, I expected more technical questions having read some of the reviews for research scientist interview process at KLA, but I had almost no technical questions asked besides questions about my PhD research, the very small details like electrical characteristics of the equipment, etc.

The interview process was surprising and unpleasant. I was prepared for a technical interview with some HR-style questions (personality/STAR). I joined a Zoom call with two employees (a team lead and their superior). At the start of the interview I was informed "These 30 minutes are for you, tell us anything you think we should know about you as a candidate for this job." I began by talking about myself and my background, as well as my PhD research. After about 10 minutes I stopped to ask if they had any questions about my research or background, or wanted to follow-up on anything. They repeated "these 30 minutes are for you to tell us about yourself." There was no clarifications, no questions. After another 10 minutes of talking about my research and skills (technical and leadership) I again asked if they had questions. Again they repeated that this time was for me. After about 27 minutes of me talking without any questions or follow-up from them, they stopped me and asked "Is there a difference between science and engineering?" I gave my best answer, then they concluded the interview and said I would hear from them either way in the next two weeks. I never heard from them. About two months later the candidate portal showed that I had been rejected. It was a terrible experience. If I knew they wanted me to talk for 30 minutes straight I would've have prepared slides.