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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
I'd implement canonical tags for your duplicate content problem instead of noindex tags. This is the recommended practice for duplicate content.
As far as pages that you don't want indexed, when you use robots.txt to accomplish this, Google can/will still put the URL & title in SERPS. In order to stop this, you do need to put meta noindex tags on every page.
Check out our SEOmoz LinkedIn Group. People add job listings all the time, and I'm pretty good at keeping it updated.