I was first contacted by the HR. Was asked the normal set of questions on time management, strengths & weaknesses, conflict resolution. The technical phone interview was setup for 2 weeks later. I chose C, MATLAB, signal processing and math. I was asked questions on linear algebra, differential equations, differentiation and integration for the math section. MATLAB, C and signal processing I had prepared looking at the interview questions recorded by previous reviewers. I studied concepts relating to those topics. The phone interview is quite simple. The on-site interview has mix of puzzles, coding, and in-depth questions on signal processing. I had seen the puzzles before in Programming interviews exposed book. The signal processing concepts asked were too basic that I did not remember how to some of them. The interviewer was nice to patiently give me hints. After the technical interview, the hiring manager drilled me on behavioral questions for about an hour. The lunch with two current ASEs at their cafeteria. Next was the HR interview where they detailed me on what is given as offer.