What I very often see in Europe isn't a marketplace of employers saying "We will pay X" and then finding a developer who will work for that. Rather, it often is a company desperate to hire a talented engineer, but when quoted a totally-not-outrageous-by-US-standards salary, respond with "Oh, we'd never pay that".
I suppose in some cases the employer literally couldn't pay that, but to me it seems more like there's some kind of cultural block, like "engineers make this amount and that's all there is to it".
Managers/executives don't seem to have any such restriction, again based on what I've been privy to, so I don't think that it's (completely) a case of just "salaries are lower here"
Dead Comment
Remote: Yes
Willing to relocate: On a temporary basis only
Technologies: iOS/Objective-C/Swift, Javascript
CV: Formerly of Shazam, have launched & sold my own startup, several personal apps on the app store. Prefer contract to permanent role but will consider perm for the right company. Personal site: http://charliewilliams.org
Email: c+hn@charliewilliams.org