ESS Technology Firmware Engineer interview questions

3 rounds of interview. 2 on phone and 1 onsite. Started with a senior firmware engineer who asked about my resume and computer architecture questions. Second interview was with the VP engineering who didn't ask technical questions but concepts about some of the things i wrote on my resume. He wanted to see how much i retain the stuff i have worked on. Finally, the onsite was a 5 hour in total interview with a variety of people - senior firmware engineers, systems engineer, project manager, analog designer, IC evaluation engineer. I was a little exhausted by the end of it. But overall the interview process was fair. Did not get to see the facility because there was no time.