I had thought the same about his background, from https://en.wikipedia.org/wiki/Jeff_Bezos looks like he was technical at college and the first couple of years (or less) of his career.

> He graduated from Princeton University in 1986 with degrees in electrical engineering and computer science.

and

> After Bezos graduated from Princeton in 1986,... He first worked at Fitel, a fintech telecommunications start-up, where he was tasked with building a network for international trade.[28] Bezos was promoted to head of development and director of customer service thereafter.[29] He transitioned into the banking industry when he became a product manager at Bankers Trust; he worked there from 1988 ...