After getting a reference and writing a cover letter, I had a single phone interview. It went very well. I spoke with the hiring manager directly, he was very nice and focused on asking technical questions and the contents of my resume. The technical questions weren't too detailed and if you have a 4 year degree in computer science you should at least know the terms mentioned. If you don't know the terms mentioned, you definitely need to show enthusiasm to learn. I was asked about my level of proficiency in C++ (do you know how to write template classes?), the internships I had in the past, my experience with developing for real time operating systems (mention Rate Monotonic and Earliest Deadline First algorithms), my experience with Agile methodology (through internships and classes), whether I knew a design pattern (and what design patterns are), what kinds of platforms I was used to developing on (should know windows and linux). And that's about all I can remember. Make sure you have some good questions for the hiring manager. You should be asking about the team, how people work together and what the team needs are.