C - data structures, embedded basics, state machines. Questions on previous positions to understand the knowledge depth. Challenging issues solved in previous jobs. Systems design questions, RTOS problems. Architectural system design questions.

It was not one of the better interviews I have faced. Interviewers believed more in the process of "elimination" rather than "choosing" the candidate. The attitude of the interviewers was unnecessarily aggressive and it seemed like they were trying to show off their superiority and put down the candidate who had come for interview. The hiring manager's questions were very vague and unclear. The product line is definitely very good and work does seem to be interesting but have my apprehensions about the team.