I applied in-person. The process took 1 day. I interviewed at Rensselaer Polytechnic Institute (Troy, NY) in Apr 2013
Interview
Met with the project leader, who asked me about my motivations and interests in the projects he was heading. He assessed basic mathematics and physics skills to make sure I had the potential to fulfill the requirements within the allotted time frame
Interview questions [1]
Question 1
Implementing Fourier transform on a digital computer