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Seems to me putting a karma requirement on posting, and requiring X up-votes before it gets to the main job page would solve that problem.

And create a new problem of more people trying to game the karma system. I think it's best to leave jobs (no pun intended) out of this place.

Does a site do this? This sounds like a great approach to that sector.

I'm not entirely sure if this is the right approach, but a job site that works as well as job postings on HN is definitely in demand