Applied Materials interview questions

I had a good phone screen with the recruiter. The next step was the interview with the hiring manager. The interview seemed pretty casual. I couldnt tell if the hiring manager was just really laid back or just disinterested in the interview. I was surprised there weren't other interviewers. It didn't seem as professional as I had expected.

4 rounds of 30 mins each. First interview was based on resume and some information about the company. What kind of work they do and what kind of work you would be doing. One interview related with basic algorithm knowledge. One interview related with your projects and the last coding interview. Basic concepts asked.