We have an occupations list which is right here
listing a fair few of the possible jobs. Specifically for the upper class, they would have jobs such as Ministry employment reasonably high up.
Jobs probably considered beneath them would be:
- shopkeepers (not always but in most cases, they could own one, just probably not run it themselves without people disapproving)
- servants of course
- healing (if you watch Downton Abbey though then you could see the reluctance there was to allow a lady of the upper class to work as a nurse and that was in 1914/8)
In the end, I think most upper class Victorians didn't work at all unless they were nouveau riche and had to in order to keep their money or else sink back to lower class, though they were frowned on anyway by 'old money'. In Jane Austen, anyone considered working 'in trade' it was considered low class though that was
100 ish years ago. The wealthy usually stayed wealthy through inheritance and investment and interest on their money and of course dowrys if they married a girl from a very wealthy family.
Of course the wizarding world has always been a little different as well which is something to take into account. Their job could be a more private profession like ummm breeding kneazles and selling them (of course by that I mean employing staff to do the dirty work xD).
Well that's all I can think of, hope this helped! ^.^