There was no interview, I was already working as consultant and being converted to regular employee. I got a offer letter after background check was done. Salary was accepted without negotiation. I had to submit my immigration papers afterwards as I was still on H1b with a EAD and almost in last stages of getting green card. I reckon getting green card was still on top of my mind which kind of prevented me from negotatiating on the salary.

Total Interview process took 3 rounds. One phone screen with basic c coding and os questions. Then one c programming interview on phone. then 6 video interviews focusing on os, comp arch, assembly language, algorithms and projects based on resume and got an offer in a week.