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> Sometimes it takes months for regular new employees to do anything productive in some of these codebases.

Which is most probably why most of them were just kicked out. Twitter isn't complicated, it's literally just a micro-blogging platform.

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I think you're underestimating how difficult operating at that scale is. There's no "just" here. It's hundreds of millions of people, all over the world, using your app 24/7, with the expectation that your platform is always there, that it shows consistent data and that it responds instantly. That's very difficult to build and maintain.

"It's just a banana Michael, how much could it cost?"

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