Infinera Staff Engineer interview questions

Though I went thru employee referral but I have given 2 phone interviews, one with Hiring Manage and another one pure technical. Then they called me for onsite interview where 5 people took 1:1 pure technical on C/C++ concepts, OS concepts and some white board exercise. After a week I got a call for another onsite interview where I met 4 people 1:1 and pattern was same except there was coding challenge or session. After a week, I got the offer and was decent one and I did not negotiated as they gave more than what I had asked. Overall it was nice experience and people are friendly in interview and are giving hints as and when required.