BuddyPress.org

It used to be possible to join a group related to hiring devs on here but I think it’s been disabled starting with 1.2. You can still visit it here https://buddypress.org/groups/buddypress-job-board but I don’t think you can make any posts to it anymore. As an alternative you could look at sites like elance and getafreelancer.

Personally I think some sort of a buddypress devs jobs board along with a link to it at the developers section would be very useful for devs looking for jobs and buddypress users looking to hire.