The salaries given relate back to expenses paid. Doctors in Europe broadly don't pay anything for medical school and thus don't have a mcmansion of debt to recoup after graduating.
Developers throughout Europe find their salaries regularly pegged to cost of living wherever they are. In the US salaries are distorted for 2 reasons - most major global tech companies are here and thus there is higher demand for developers here than elsewhere - and two that those tech companes congregate in the most expensive cost of living places on Earth due to NIMBYism and Americas broken city planning culture.
In general almost everyone in the US is paid, comparatively, more than their European counterparts because their raw income has to afford to cover potential medical expenses that nobody else abroad has to contend with. Americans also get much reduced food, utilities, and housing benefits compared to the broader first world.
> Developers throughout Europe find their salaries regularly pegged to cost of living wherever they are.
Even if that is the case, if you compare salaries for mid-level developers in cities like Miami and Amsterdam, I think the pre- and post- tax situations are pretty drastically different.
That sounds outrageous but isn't the same for software engineers as well?
Senior level software engineers in (not San Francisco/New York/Los Angeles) can easily make $80k - $160k.