You should write a book or a blog about how to not rock the boat at large companies. Maybe you can call it Going Nowhere Fast.
Large companies normally (unlike Twitter) have achieved strong product market fit and are all about tweaks that deliver marginal revenue. Given that they already have a big slice of the market, the multiplier on marginal revenue makes what you're doing worthwhile.
"Rocking the boat" is more likely than not to make things worse.
The right approach when you're new is to quietly pick a simple problem away from the core services where you can learn the processes and polices needed to get something into Production. More so when you're in a company that is undergoing a brain drain.
Then you can progressively move to solving more demanding and critical issues.