Check out contract roles that are EU-friendly in London & angel.co for remote jobs in the bay area that are happy with global hires. I had a contract with a company in SF while living in Oxford for ~160k and know London pays 700+ per day for mid-senior developers. There are contract-specific jobsites out there but I can't google them right now because I'm on a company VPN.
Could I reach out to you separately so as not to run out of thread depth on here?
(The big question I have on this is if you have a link discussing implications for tax etc. on taking a role from the USA while based in the UK - which is an easier option for me at this time).