I got on Skype with Dennis Li of HackDuke, who now works at Coursera, a leading edtech company. He founded HackDuke, which has the theme of "Code For Good." They take the emphasis away from prizes and onto creating innovations with a social impact. He is not quite a developer evangelist, but he does represent Coursera at hackathons now that he works in Silicon Valley.
Listen on Soundcloud -->
[Shownotes coming soon!]