My career has been very YC-centric. At Crocodoc (W10), I focused on building our infrastructure and designing/maintaining the document conversion API; what would today be described as 50% backend engineer and 50% devops. Crocodoc was acquired by Box in May 2013 where I stayed working on mostly the same stuff for about 2 years. After that, I was Tech Lead of their infrastructure engineering team at PlanGrid (W12) for a while. Now I'm on the software team at YC itself which has been an great fun!!