It would be a good idea, there have been one or two already created but the long term problem you'll have is people making shit posts and just spamming, it's something that even plagues your regular job search sites because most job sites I've looked at are filled with marketing scams.
I personally wish we could have some kind of combined effort on the internet to get rid of these blatant spammers actually but it's something that's clearly going to be with us for a long while.
You're right; one problem I have with other Bitcoin jobs sites is that they don't seem to do a very good job of policing their own sites to get rid of the scams and Spam. I want to create a legit jobs board, though, so I'll probably spend part of my time policing it for anything that looks "off".
You could have their be a charge, even if small, for both posting work solicitations and jobs. It's like the idea of charging $0.01 for email senders. Any legitimate person would pay this amount (and gladly so, as to no longer receive spam). I've been thinking about a doing up a good job board as well, though bootstrapped in Rails, not wordpress.
That's a good idea. I make some cash flow from the site and the spammers would probably look elsewhere for the free options. I probably won't charge a ton because I don't want to leave legit buyers and sellers of services out in the cold because they can't afford to pay a lot up front. What do you think of having some kind of monthly subscription plan where employers can sign up and then post a certain amount of jobs a month?
My thought would be a business model where you charge the employer something like $10 for a post. People looking for legitimate jobs will easily pay that much, and maybe $0.10 for a job seeker. The idea here is with the $10, you stop spam in it's tracks because that's a real cost, and someone that needs a job filled this is not a hefty expenditure. Craiglslist started charging $25 a long time ago, and it's still the only thing they charge for, and it works great. I've hired a bunch of people off of CL and it's still the first place I go to. The $0.10 for job seekers is enough they don't spam resumes back to everyone indiscriminately but is not a big enough of a hit to keep them from applying.
There's nothing better than the subscription charge model (i.e., "gym memberships") but it's harder with BTC than with credit cards because you need the sender to physically make the transaction each time you request funds unless you escrowed up front or something. I'd say stick with the model of listing at time of payment and having an expiration period, 30 days or the like.