Yeah, that is good idea. I am still not sure should each community have a Channel for job related opportunities or to create new community which have all that channels like u mention @skiu for uiux, web dev, etc.
Thinking from user perspective, what would be the best
A channel where all the job opportunities are listed and user has the option to filter it accordingly
Idea for community at one point is to make member profiles to become available able for hire, by clicking on checkmark where it will add fields to fill, like Title, skills, rate, location