The 'Employment" module made available within the Yabber framework exists for obvious reasons. Managed through Yabber, it''s a piece of cake to use.
Advanced usage allow integration with a few external services, but most ACL holders will simply promote their model to other brokers. There's a couple of dedicated internal pages created for mentoring and related gigs.
Various RSS, JSON, and XML feeds are available for those that share data externally.
This module isn't important until your need it.