That said, I don't think I've ever even seen a job posting for a part-time dev. Do these exist? I don't need benefits, I have health insurance and everything else I need covered. Just a steady paycheck.
You also need to try the right kinds of places. Small shops, startups that are cash constrained, consultancies or agencies with variable amounts of work, bootstrapped companies, and tech enabled service companies are all good fits. Big VC funded companies spending other people's money, not so much. Just plan on sending out tons of applications and you'll find some.
- convert a full-time job to part-time
- work with a fractional placement agency like https://www.forward.id/
- talk about the possibility of part-time in your first conversation with a potential employer (saves everyone a lot of time)
That said, I think they're still hard to find (and land). I made
to try to address this problem for myself. I want to just say how much I want to work, how much I want to make, and what I like to do, then get emails when something that fits comes up. It's an ongoing work in progress though and will take more testing to get right.
A dozen years ago, rentacoder was 99.5% people wanting impossible things for $50 but there were some worthwhile "I want a visual basic app that does this clearly defined task and can be created in two days" jobs. (rentacoder got sold and stopped being useful)