I retired early recently - I am in my mid 50s. It's not anywhere as hard as people seem to think. With a disciplined approach to investing, I think that it's very much possible to reach financial independence with a typical tech salary in the US. I achieved FI without an extraordinarily high salary, stock grants or participating in an IPO.
There is a treasure trove of information in the Bogleheads wiki: https://www.bogleheads.org/wiki/Getting_started