Yup. Been for a few years now. Hired through normal application, full time developer on a team of 6-ish. Worked there for a few years before negotiating down to

Yup. Been for a few years now. Hired through normal application, full time developer on a team of 6-ish. Worked there for a few years before negotiating down to 90%; a day off every other week. Then a year after that negotiated down to 80%. Proportional salary cuts in both cases. Wasn't very hard to convince them. Made sure I was available for whatever coordination is required. Made sure I still meet expectations. Argued that my productivity wouldn't fall proportionally to the drop in time. No one has complained. Was a few months of adaption to make people realize I'm normally not available one of the days a week, but everyone has taken it in stride. Most are a little jealous.