I don't know your level of experience, and don't take this as rude, but in the DC area, which isn't as expensive as SF I believe, seasoned developers are getting GS13s and 14s here.
I was recently offered a GS14 step 8 (which I think is around $110k or so) for Python development.
I was recently offered a GS14 step 8 (which I think is around $110k or so) for Python development.