All technical questions for the hour-long phone interview. He started out with basics: C++ keywords such as static, volatile, atomic operations. And then a coding question, where your asked to identify a certain 5-bit pattern given a bit stream. The onsite interview was 6 hour long, a different interviewer per hour. The structure is very similar to the phone interview, where they start out asking you about your background and some basic knowledge questions, and then hit you with coding problems. Was able to answer 80% of the questions, and receive interests from 3 different teams, but did not receive an offer for US branches due to VISA problem.