Swift3 years experience
I work on the Swift compiler for fun. If you use Swift, you use my code every day!
iOS6 years experience
Believe it or not, I was doing iOS dev even in the jailbreak days. iOS is sort of a very broad field, so it's difficult to quantify how deep my experience goes "as...
Git4 years experience
For a period of time, I maintained a fork of git. It turned out not to go anywhere, but it was a very interesting learning experience.