It is, but with the very specific implication that you will pick up lower-pay, lower-skill work as needed. I'm personally not a fan of the label BaristaFIRE because I think it was created by the same folks who are weirdly convinced that if they leave their careers, the only options available to them to make money will be low-skill, entry level jobs.
I've lost count how many times I've seen people utterly convinced that their professional value will basically evaporate forever in a puff of smoke just because they wouldn't have the option to go back to their specific, highly compensated career.
It drives me batty how limiting so many people's thinking is. Meanwhile, the world of casual/part time/flexible paid work is absolutely, astronomically massive to the point of being essentially limitless.
This is me. I work in consulting/civil engineering, and I haven't asked, but I'm fairly certain that no company would hire me at any type of part/half time basis. The work require you to put in a full week (or more) to meet the client demands, and respond to things regularly. You can't really be out 2-3 workdays a week if that's when they expect an email back. Or they want the "3 weeks to create" report in 2 weeks. The value of 20 hrs/week of my work would be vastly less than the 50% savings in my salary (so then just hire someone else full time anyway).
I'm certainly willing to do some research and maybe ask around when I get closer to my FIRE number, but I'm not hopeful. I know some people who work as a 1099 contractor where they get their own work, or not. But then you're not really "part time", you're just a business owner who can choose to not take work for a few months of the year. Could be an option. But also how many times can you turn down work before clients stop calling you..?
Besides that I have no marketable skills. I can't "make" anything that isn't already on 100s of etsy stores for less money and better quality. The myriad of online freelance jobs, realtor, etc are equally saturated (and frankly soul-sucking). So yes that leave entry-level service jobs. Which I've never actually done, and don't feel a strong desire to enter in my 40s..
Bartender, barista, incompetent handyman? These are the options I guess..? I'd be happy to hear any suggestions that are not retail/service, or require unique talent in something
Is there some kind of civil engineering certification test? Could you help people prepare for that?
Unless DH is able to get some sort of cushy and appealing consulting type set-up, one of our plans is for both of us to sign up to be substitute teachers. It's really the most flexible option I can think of. If you have a regular tennis game on Tuesdays, you just mark yourself permanently unavailable on Tuesday. If you will be traveling the first 2 weeks of Feb, not available. If you get a phone call on a random Thursday and you are just feeling sleepy and want to go back to bed, you say no.
You can generally choose the grades you want to be considered for, as well as which specific schools. If you are decent, teachers will begin to request you specifically. You can sign up with more than 1 district if that's a reasonable commute time for you (remembering that you can choose only the nearest schools) and also sign up with private schools.
Mostly, I love the idea of never having to say no to anything because of your schedule. Pay is pretty mediocre-low, but that's fine.
I'd also love to pick up some virtual ESL tutoring. I did think in-person when I lived in Japan and it was a fantastic experience and it's truly the best I've ever felt about how good I was at a job. I'm not sure how to get started, but I doubt it would be that hard to find at least 1-2 clients to meet with on a weekly Zoom.
I also have a part-time, super flexible, remote copywriting gig. Pay is low, but it's so flexible that I don't mind, and the work is usually semi-interesting because it forces me to research random topics, which I enjoy. I plan to keep that going long-term. Even if I only bring in a few thousand dollars a year, that's meaningful when you look at how much stache it replaced. $5000=$125k you don't have to have saved, which is probably a year+ for nearly everyone, even looking at how much a large-ish stache would grow in that year.
None of these are huge money, but they are probably all more than an actual newbie barista makes.