After 23 years working for Jeff Bezos, the CEO of a $1.3 billion skills platform shares lessons he learned from Andy Jassy and the Amazon founder

In 1997, the day before Greg Hart joined Amazon, he was summoned to a meeting—on a Sunday—with its founder, Jeff Bezos.

At the time, Bezos had interviewed virtually every one of Amazon’s circa 200 employees; Hart was one of the few the tech entrepreneur hadn’t personally appointed. Over the next 23 years at the online giant, Hart reported directly to Bezos as technical advisor to the CEO, and to Amazon’s current CEO, Andy Jassy.

The lessons Hart learned at one of the world’s most...