I can summarize my path. Ages 12-20, wrote code every day. Took a QA job at a small software company. Moved to development team. Spent 6 years there. Used that experience to get into Microsoft. 5 years there. At that point, there were almost no companies that wouldn’t interview me, and it was just on me to do well in the interviews. I have practiced white boarding all through my career.

So the idea is to get your foot in whatever door you can at that time, and climb when you can.

I used to work with a guy who dropped out of a gamedev course at a second-tier university. Graduate SWE at a respectable/selective company and all.

Admittedly, this was at a company with about 500 employees and 1 part-time HR person (who quit 6 months later and wasn't replaced).

do you think it's possible to work at companies like amazon and google without a degree at all?

I started in the industry 7 years ago without a degree and am doing well.