I’d like to use my physics degree for something good

Honestly I would do whatever was needed of me that matches my skillset or if being educated in a needed field was an option I’d do that. I don’t mind if it’s not a glamorous job or anything, if I’m legitimately helping to build communism I’ll do basically whatever.

Without further context, this kind of thing just seems to me like an exercise to get people to imagine a better future. And remember, some people are very stuck in a mindset that a better future is not possible and that the current way is inevitable and always has been.

I also disagree with this framing:

These people are why communists are seen as a joke.

I don’t think communists generally are seen as a joke, first of all. In my experience, the detractors tend to either frame them as frightfully efficient villains or woefully inefficient idealists. But even the most vicious anti-communist rhetoric seems to acknowledge on some level that communists have been impactful historically, even if that rhetoric frames it as a negative impact. There may be a distinction here between communists and communism, where the 2nd is more what’s framed as idealism and the 1st as the villainy.

Second, the wording here is “leftist commune” not “communist society”. Those who use “leftist” to describe themselves, at least in the US cultural context where this might have derived from, can range from “I want universal healthcare” to, well… ultras. There is a lot of ignorance and newness to communism within that, and being a little naive about how things are going to go isn’t necessarily the same as having firmly held views that insist we can “jump from how things are now to fully automated luxury gay space communism within a year, if only people push hard enough on being principled and not revisionist.”

my job will be to shoot down anarchists

OOP’s answer is a bit silly, but the question is good… The answer that I want to give right now is “translation, subtitling/captioning, recording audio descriptions, language teaching for teenagers and adults, and something related to linguistics” — so, literally just the things that I already want to do with my life, and I can imagine many ways in which these jobs are vital for society.

…But it’s like, if there’s only limited spots for these jobs, because there’s a more pressing need for people to find other jobs, and jobs in this society are assigned based on objective merit and formal qualifications above personal interest — then I would be perfectly happy to work as something else, and only fill in for these preferred jobs when there’s a shortage in one of them, or perhaps “chiming in” during my time of rest.

All things considered, I feel like I could probably work most jobs on some level, provided that I’m given adequate training and the jobs are made accessible — which I’d reckon would be the case, since this would not be an economic system that needs to marginalize certain groups out of the workforce in order to sustain itself, nor would it be an economic system where overqualification is an endemic feature.

So I guess the sky’s the limit, then.