When you think 10x developer, you should instead think about devs who built industries, or devs that made such huge impact that them being human has been questioned. Widely known examples might be: John Carmack, Linus Torvalds, Joel Spolsky, etc. For industry-specific ones, in JS-land you could think of TJ Holowaychuk or Sindre Sorhus. And for quantifying it a bit from the "business" side, think that Instagram reached 14M users with 3 Engineers and Whatsapp supported 450M users with 35 engineers. For a more general view, "/fast" is a great read: https://patrickcollison.com/fast