I'm not quite who you are asking about, but I'm a programmer who already does part-time work (only). I think the only issue about it, is that it is difficult to find clients (fortunately once I find them, I tend to keep them). Most people who need a developer, are not accustomed to the idea of having one support them in some way part-time. In some cases I've gotten a client who was looking for a full-time dev, and eventually gave up and agreed to hire me part-time out of desperation. But most potential employers are not familiar with the idea of hiring a dev part-time, and because it strikes them as weird, they shy away from it.