I suspect salaries for software developers in San Francisco are just a bit mad. The numbers floating around suggest more than twice what you'd get paid working

I suspect salaries for software developers in San Francisco are just a bit mad. The numbers floating around suggest more than twice what you'd get paid working on hedge fund software in London, which is in turn maybe 3 times more than an ordinary software developer elsewhere in the UK. (If it makes you feel any better, I earn less than you working as a software developer in the UK.)