fossjobs.net is the first website exclusively for Free & Open Source jobs.
It uses the open source software Jobberbase. See their README.md for links and installation guides.
You can post a job on the website, as long as it directly improves FOSS or open hardware projects. You can also submit jobs directly by emailing submit@fossjobs.net.
In addition to the website, submitted jobs are also published in the following places:
Connect with the community via IRC or through the issue tracker on GitHub.
You can also message/mention the Twitter or Mastodon accounts directly.