An engineering manager got in touch with me and set up a phone interview. The interview was easy and I was able to answer all questions put forth to me. After a couple of weeks and a few reminders, the HR asked me for my resume and transcripts. The next day, the engineering manager whom I had interviewed with, sent me an email saying that I was not selected for the next step in the process. Got no response when I asked for the reason I was rejected.

The topics included dangling pointers, virtual destructors, interrupts in OS, and questions on pointers. Basically if you have read a C, C++ and an OS book, the interview should really be easy. It's just based on what you know, rather than questions that require you to solve.