I wish there were a real example (to get a sense for the types of things he looks at), involving an open source project (how about coffeescript itself?)
Is it enough to say that his credentials are everything that he's ever written made available for public perusal? There's a lot to chose from. If I had a JavaScript/CoffeeScript/Backbone codebase that needed some love then I probably wouldn't hesitate to contact him based on the example set in his public code (and that he's the primary creator... but maybe that goes without saying).