For the Netherlands, Gergely Orosz recently published an interesting article titled "The Trimodal Nature of Software Engineering Salaries in the Netherlands and Europe" at https://blog.pragmaticengineer.com/software-engineering-sala...
It's a worthwhile read, but this bit from the start is notable:
> The 2019 Honeypot Amsterdam developer survey says, "the most experienced developers earn an average of €55,000 high as over €70,000". The 2021 Talent.io salary report puts the most experienced software engineering salaries in Amsterdam at €60,000/year. Meanwhile, I've observed the average senior total compensation figures at Uber nearly double from €110,000 in 2015 to €170,000-€230,000/year by 2020. It's not just Uber: Booking.com senior total packages have gone up by 50% from around €100,000 in 2016 to €150,000+, as part of the EU salary research I've been running