From Joomla! Documentation
The Joomla! Bug Squad (JBS) is a team within the Production Working Groups. Their job is to identify and fix bugs in Joomla. This includes the following:
- Scan the Joomla! CMS 3.x Bug Reporting Forum for reported issues and help community members with solving these issues.
- Report bugs on our Issue Tracker
- Fix reported bugs and resolve reported issues according to the Bug Tracking Process.
The Bug Squad is also supporting with testing and quality assurance when a new major or minor version is developed. Generally speaking the bug-squad is in the lead when a version switches from beta-stage to the stable-stage within the development cycle of Joomla!