I think they are comparing staff engineers with contract janitors. I think most of the pay differences are between engineer / janitor, not between staff / contr

I think they are comparing staff engineers with contract janitors. I think most of the pay differences are between engineer / janitor, not between staff / contract. I heard that engineers on contract at Facebook are in general paid very well and I suspect many could easily move to a full time position at a less-hot company, but choose not to.