I've met two that made my jaw drop. One was a guy I went to university with, 19 yo first time I met him, who was extremely good and had been running his own web

I've met two that made my jaw drop. One was a guy I went to university with, 19 yo first time I met him, who was extremely good and had been running his own web developing business as a side gig since he was 16 (for Swedish readers, just to get a sense of how good he is, he made www.breakit.se in 2014, no idea if he's still maintaining it though or if they've switched to a different stack). I haven't heard of anyone who knows who he is know in this city who's also seen a better JS developer. However, he was a real pain to work with. If you didn't work quickly enough for his taste he would tell you to move away from the keyboard and he'd show you how it's done. He also did not like compromising with other people in discussions and he liked to do other people's tasks without telling them. Despite that, I recommended him when my boss asked about him with the caveat that he should ask honest questions about expectations on the work culture, specifically team work. Turns out he insulted my boss and my company pretty quickly in the interview. My boss told this guy about how we've worked hard to do continuous delivery the way we do today and this guy laughed my boss in his face and basically said "well, you might win over a lot of people who write software for the government with that story of how you guys put on your big boy pants but I do six deploys on a bad day". Apparently he instead went to a game studio and is a better fit at that place. The second dev who took my breath away was a man in his late 40s who had consistently moved from companies as soon as they wanted to put him into management. He loved to code and was very good at it, but for some reason management wanted him to make room for younger hires (can anyone with more experience explain why that would be the case? This man has 20+ years of experience and loves to code, shouldn't he be more preferable to some kid?) so he was able to leverage his contacts he picked up as a consultant to change into high paying developer jobs. He was very understanding of how bad I was when I started out as a developer and was my mentor for a long time and his discipline still inspires me. It was an honor working for him, why people want to make such a good developer into anything but a developer, I'll never know.