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It’s not a matter of ambition or lack-of. Nobody is going into a 100k+ company and just changing the entire corporate culture around something as broad as bug fixing. These companies have hundreds of teams, and decades of entrenched culture. Sure, go in and improve what you can in your own lane, but be realistic about your scope and reach.

Nobody ever changes anything and new hires should have no aspirations or goals but to be code monkeys.

Your outlook on career growth is nihilistic, not realistic.

Your outlook is not realistic.

My outlook is "Sometimes if you have ambition and opportunity, you may be the person that can make things better."

I have made no claim or assertion other than that. If that's not realistic to you, then I sincerely and genuinely would advise you to seek therapy, because that sounds like depression.

More than once I've had a chance to interview (brief) somebody who was about to take a job at a "big tech" company and interview them again (debrief) after they left.

Frequently they were excited to start work at a place where they could "make a difference" and within a year they came to the conclusion that there's wasn't any possibility they could make a difference.

Organizations of that sort have no interest at all in hiring people who aren't going to cooperate on their process.

You can't in a year, but you can easily in 5-10 years.

If they were excited to make a difference at a big tech company and gave up in a year, it sounds like they didn't understand what they were getting into at all. Goals take time.

To be fair, people have a lot of fear of wasting time, being co-opted, losing their values, etc. I agree that a lot of people lack patience, but a bad situation can be more patient than you can be.

Clearly you've never worked at a large company before :)

Hold on to your optimism, but try not to let that turn into scorn for folks who've seen the other side.