Very straightforward. I applied in October and was offered the internship in December. The internship application process was easy - just submit a resume and cover letter. This is then followed by a skype/phone interview. back.
I applied in-person. I interviewed at 1776 (Washington, DC) in Apr 2016
Interview
very simple, talked to the operations manager who has a army of interns. i would suggest going on a different route if you want to learn about the seed fund, can get dangerous doing nothing.