Paul Biggar never wanted to be a CEO. He's a compiler nerd who built CircleCI, now valued at $1.7 billion, by solving a problem he saw at Mozilla. After stepping down when the company was worth just $20 million, he's now working on Darklang, an even more ambitious project to eliminate cloud complexity. This is the story of how a technical founder built a unicorn, knew when to step aside, and is now funding his next moonshot by selling equity in the company he no longer runs.