Ask HN: Startup salaries in London, UK?

Hi HN-ers,

Just wondering if what’s a good salary range for seniors/juniors front-end/back-end/full-stack engineers, UI/UX, testers, etc in London? I’m hoping to get to a realistic number that I can then request for investment.

I am also curious about how fast I can build a team - like it is relatively simple to hire and onboard fairly quickly? We have a project that we would like to start building relatively quickly.