Ask HN: How do developer salaries differ across European countries?

I am a mobile dev with about 3 years of experience exploring potential opportunities abroad in Europe. It would be helpful to know, how salaries differ across the various countries. How much do developers typically make in the different countries? How does that differ for Junior vs Senior developers? What countries are known for having larger tech scenes? What countries are in need of more developers from abroad? How does the standard of living effect salaries? How does the quality of life compare to a developer in the US? I would love to hear about your personal experiences working abroad. Anecdotes welcome, data too