When comparing European and USian salaries, it is important to remember that companies primarily care about what it costs to employ you, which is different than the number on your paycheck. Generally speaking, the cost to employ software engineers in the EU is much higher than in the US, so even though the differences in salaries seem large the cost to the companies are often similar. The proportion of that cost that goes to salary is simply much higher in the US.
Places like Silicon Valley and Seattle are still outliers but if you looked at "typical" software engineering salaries in the US the differences in salaries are explainable almost entirely by differences in payroll costs (various taxes, regulations, etc) that the employee never sees.
Places like Silicon Valley and Seattle are still outliers but if you looked at "typical" software engineering salaries in the US the differences in salaries are explainable almost entirely by differences in payroll costs (various taxes, regulations, etc) that the employee never sees.