I worked with a guy who wrote code like this. He was, indeed, pretty productive, but it was hell sitting next to him without good headphones. Was this guy you're referring to a long haired, kinda scruffy guy who had worked at Amazon at one point?
I didn't really follow the Amazon tech talks while I was there, so I'm not really sure. I also didn't even realize the significance of who I was talking to when I approached him. All I knew was that when I searched for clojure code in the repos, his was the first name that popped up. I dropped by his desk unannounced and we talked for like an hour and he walked me through setting up an environment there on the spot.
I'm pretty sure he was the one that pitched drone delivery to Bezos, and he had worked on it the entire time I was there. As far as clojure goes, I have no clue why he seemed to stop using it, although I have my suspicions. I think common lisp was probably a better fit for what he was doing, and he seemed to be quite the expert with it, although I think I recall him talking fondly of Scala and F# as well.
He found a bug and made a proof of concept webpage to demonstrate it. So when he talks about it he is both the user and the author of the web page. In general You wouldn't expect them to be the same person.
One thing to note... he doesn't bother himself with pretty websites, community building of any kind, splash pages... It's just plain html. Not even github as far as I could tell. He just works on the tech and puts it out there with benchmarks as proof of his claims.
(Author) I took his JavaScript 30 course ages ago so it was really cool to interview him. I didn't realise he didn't have a CS degree which is kind of nuts considering he is one of the biggest teachers of web development on the planet.
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