So I'm trying to hack the system to get fewer hours: 30-32 per week. That gives me enough time to self-study, handle some of my own training and overdeliver, yet still have a life.
I have extremely strong open source bona fides, I'm an inveterate organizer of study groups both at work and elsewhere, I speak regularly at meetups in order to force myself to learn new things well. Giving me the space to train myself is a great deal for potential employers.
But they aren't biting. 40 hours is what they are set up for and it is hard for them to figure out how to be flexible, even if they want to.
At my last job with a small growth-stage startup, I successfully negotiated for 32 hours, and it worked out great for all parties. But it seems harder than I think it should be to close such deals.