I am a software engineer at Canonical working in Go on Juju. I live in Massachusetts and have 15 years of professional development experience and a BS in CS from a decent technical university (WPI). When applying for the job, I asked for (and got) the same salary I'd ask for if applying for an office-based job in Boston (which was a fairly significant bump over my old office-based job in Boston). From what I understand, Boston salaries may be lower than those in SF, but the cost of living probably makes up for the difference.