I submitted my CV online and received an email from HR to schedule an interview. The initial interview was short and covered very basic stuff like background and time management. After that I was scheduled for a technical interview. The questions for the technical interview are pretty much along the ones that have been posted here. The interview covers four areas: mathematics, one area of electrical engineering (I chose signal processing), programming (you have to choose C, C++, or JAVA) and Matlab. I did extremely well in all areas, except programming since I have a PhD in electrical engineering but not a very strong programming background. From what I had read here, I did not expect to get a call back. Most people had mentioned that you need to get above 95% of the responses right to get a call back. But a few days later, I got a call to invite me to Natick for an in site interview. I will update this after my interview in Natick.