For most of the time that I worked at amzn, it was really just Jeff, Shel (Kaphan) and myself, with Mackenzie apparently do the accounting somewhere else. The three of us were a tight threesome back then, and we knew that we were building something very new and quite possibly momentous (in particular, the idea of what we called "almost in time" retail, aka "we don't have it in stock but we can it for you really quickly"; of course, that idea has largely gone away these days).
Jeff had much bigger dreams from day zero than most people acknowledge (basically, to be the Sears of the 21st century), and Shel and I both knew that.
On the other hand, day to day work involved mostly the same old problems, there were the same conflicts (i excused myself from all discussions about website design because it was clear that Jeff and I were never going to agree about almost any of it), and the whole thing felt as if it could have folded up at any moment before about (say) October of 1995. After that, there were more people on board, sales were skyrocketing, and it was clear that it was a thing.
I left amzn for many reasons, but in part because it was obvious to me by the fall of 1995 what kind of company it was going to become, and I wanted nothing to do with that. I still don't, which is why I've spoken out a bit more publically about the company over the last year or two.