It was nice but took much time. I had two interviews. First one my knowledge was examined with a technical questions. For the second one they asked this design question.

Phone round of 30 mins, and on site 3 hours (1 hour each with 3 interviewers). Interview questions were mostly about C/Embedded concepts, pointers and memory leak questions. Overall difficulty was average. I did not accept an offer, as it was a 18-month contract to hire position and being on H1-B visa and currently living half-way across the country made me uncertain .