> Obviously the people who write for fb or airbnb or netflix might well be professional tech bloggers or people in tech-leadership positions that tell other people how to do the work.

Not usually. Usually the way it works is the person who wrote the code and developed the technology decides to write a blog post about it and then writes it. Then they pass it around to their peers and other leadership for comments and edits.

Then, at least at Netflix, the next step was usually to publish it yourself on the tech blog. Sometimes if it was a big new tech it might get reviewed by PR or legal but not often.

At the other tech companies I don't know what their process is after that.

But what I do know is that I know a lot of those authors personally and they are definitely implementers.