Post it. With your contact details in your profile, anyone interested can contact you. Everyone else can ignore you.
However, that will mean your post doesn't get voted up, and therefore doesn't get seen except for the 30 minutes or 90 minutes that it's on the "new" page.
For visibility, you might want to write something interesting about the job so people think the post itself is of value, and then add the opening as an addendum.
If it's not spam, if it has something of interest, and if it adds value, no one will mind.
Probably.
