There were different Stages of interview. one of Stage is interview about general background and what do we know about the company another Stage is more on Technical questions. This is typically a panel or 1:1 interview with the direct hiring manager. The last Stage is about the negotiation, job grade and salary matters

Refered by a friend in the company. Then HR told me to interview after around 1 week. The interview lasts 4 hours with 3 rounds. First, talk about myself and process control method and basic semiconductor process method then talk about physics of semiconductor, more like concepts. Finally, talk about your opinion on this company and your characters with your ambition or career objects in this company that you want to achieve.