It's a little hard to compare across countries in Europe, even within a small country. I'm in Denmark, but outside Copenhagen. $90.000 isn't a terrible salary and $100.000 is pretty doable for a senior developer, dev-ops or operation person. You can go a bit higher in Copenhagen. That's not for the FAANGs, that's for the companies that a desperately looking for employees.
Other countries have much lower cost of living, so I don't see the issue with saleries being lower in those countries.
Again very much depending on which country you're in, I'd say that $50.000 is a starting salary, perhaps on the low-end, for a developer fresh out of school.