>but how do we accomplish that when there isn't one?

I worked for a small (~300 engineers) well run org in Verizon before I went to Google, and I was surprised at how well their training was, even with smaller budgets, and a tier below compensation wise and interviewing rigor.

This org supported being deliberate about hires, getting people who were experts and liked coaching/training along with those who were newbies with aptitude and desire. There was good documentation, good shared culture, and lots of safeguards like linting, excessive testing, example projects, if not quite the full fledged codelabs google has.

But part of it, both for Verizon and Google, was signaling that "good people work here and are well rewarded" (comparatively).