What are Snowden's technical credentials? It's never been clear to me that he was more than "competent" in this area. I always assumed it was his moral compas

What are Snowden's technical credentials? It's never been clear to me that he was more than "competent" in this area. I always assumed it was his moral compass that was unique about him, more than anything else. What does he offer, from a technical standpoint, to this project? Not saying he wouldn't be able to; put a geek in a room with nothing to do and that geek will become an expert on something, for sure, I'm just ignorant as to what sort of geekery he's been up to.