I am a BigCo SWE and I have long wanted to organize, but as a sole provider I don't know how to do so effectively without significant risk to my family.
The sad facts are that most workers in the US: lack class awareness thanks to decades of successful pro-owner, anti-worker propaganda and policies; are falsely divided along lines which are convenient to the owner class (left/right, boomer/millenial, gay/straight, receiving public benefits/not); are unknowingly and dangerously close to medical bankruptcy even when covered by "good" insurance; can't afford to be even temporarily unemployed, because their health coverage is tied to their employer; can't afford to protest or attempt organizing, because they could then quickly become unemployed and endanger their dependents.
The Silicon Valley engineer earning $500k/year is better off than the midwest bank junior IT worker earning $50k. But they are part of the same class and should organize accordingly in order to gain true leverage.
Having competing job offers is a kind of leverage available to some, at an exhausting personal cost. These can be used to obtain one-dimensional improvements like higher pay, more vacation days, or choice of projects. But true leverage could make CEO's weepy and meaningless "I take full responsibility" statements actually mean something, among other things. The recent layoffs in the US including a hefty severance rely on luck, not leverage.
Tech workers probably have all the tools needed to organize effectively, and not only among themselves. But whisper "union" and ten peers will chime in before your next breath with falsehoods and other generic claims based on misremembered anecdotes which miss the point entirely and diffuse useful discussion.