I have, and through many years of training (and more importantly, tons of hard work + raw talent on their part) have watched a few become very senior engineers

I have, and through many years of training (and more importantly, tons of hard work + raw talent on their part) have watched a few become very senior engineers / senior leaders in engineering management. This was years ago and they were from one of the bootcamps that only gets paid if you get a job as a software engineer.