4166/month is only $50k/year. It's easy for software developers to make more than $100k/year, especially in the bay area.
So they'd actually be taking home closer to $5416 per month.
Still "sad" (given that average rental rate on a two-bedroom apartments is $2K+ per month in the general bay area), but not quite as much.
I was just saying that the figures others were reporting were overly pessimistic.