I am not sure if I get the question right. But, here are my comments:
You need to create groups for people who are looking for jobs. You can create different groups for different types of jobs. However, if the group is secret, the users (job seekers) cannot find the group on the "Groups" page. You need to make the groups "Private" so that job seeker can "request to join" the group.
Then you can add recruiters to different groups, where they can see the jobseekers' posts. However, all other members in that same group can see all the posts created in that group as well.
I would recommend reviewing these links: