And there are major differences even in the EU. The wage gap for a developer in the V4 compared to e.g. Germany (UK/Switzerland in a broader context) is staggering.
https://elsajohansson.wordpress.com/2017/09/13/what-does-a-w...
https://elsajohansson.wordpress.com/2017/09/13/what-does-a-w...
The only way to be paid according to your real value is to freelance or start your company.