There is levels.fyi and teamblind.com and glassdoor.com, although more US oriented. Europe IT/software developer salaries seem to very slowly catch up with US,

There is levels.fyi and teamblind.com and glassdoor.com, although more US oriented. Europe IT/software developer salaries seem to very slowly catch up with US, but are still much lower (even when taking cost of living and social security taxes / health insurances into account) So try to talk to others around you, if above websites don't cover your country. Or try to move.