Innaovtive work, relaxed environment, good pay
Not much that I can think of.
I applied online. The process took 2+ months. I interviewed at Center for Advanced Research in Engineering (Waltham, MA) in September 2011.
They always interview several times, all the way up to the CEO. I think this is very effective. The interviews were in depth and lengthy, but enjoyable and not too serious. The interviews got more intense the higher up in the organization you were meeting with, however everyone made you feel very comfortable.
There was some salary negotiation, and it went favorably for me. It was a positive process and experience.
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