Marketing, sales, numerous supporting jobs in entertainment, skilled trades and engineering, (as many mentioned) white collar food industry jobs, logistics, accounting, statistics, mediation, community builders, I could go on and on. So many diffierent types of jobs, even when you exclude all the shitty ones that make the world a shittier place, like low-information political shills and propagandists, (tiny conservative talk radio shows and online communities do decently, moderate and liberal not so much) junk and junk food marketers.

I would imagine any engineer or someone who went through trade school. Maybe they don't make enough to be considered middle class?

Many trade school disciplines.