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I have almost never seen such a thing. The $500/hr freelancer are probably the same category as the $500k programmers. They exist but are quite rare.

Most senior devs at FNG reach 500k and beyond (US and London).

For U.S. I understand, but do you have any official info that seniors make 500K of total comp in London?

Definitely not in London

Yes, in London. Facebook is actively poaching devs from the finance sector.