I offer a number of commercial services:
If you’d like to discuss these, or have something else in mind, please contact me.
Jon showed me how to apply many of the concepts about unit testing to iOS. It was the one thing I needed in order to use it everywhere. Jon is one of the few who knows the stuff and knows how to explain it. My customers value my knowledge about testing and it is always a differentiating factor with my competitors. I owe a lot of it to Jon.
Jon approaches software as a craftsman. In my years as a professional, learning from Jon has probably been the single biggest influence on the way I write software today.