I think that, being a member of a Pureblood family, they wouldn't
need a job.
Unless, of course, they aren't a central family member (i.e. cousin intsead of direct heir).
But I suppose that if they had to take a job, I agree with Courtney - a high-level Ministry personell (head of department, most likey) or a part of the Wizengamot.
I'd also want to say that maybe something that doesn't require too much effort, unlike an Auror. Even the the postition is highly-regarded, it requires a lot of extra work and schooling. I think that a pureblood male would want something minimal effort, maximum profit. Maybe owning a chain of wizarding shops?
Hope this helped!
- Cammie!
