Mah contributed to the hallowelt/mediawiki and SemanticMediaWiki/SemanticMediaWiki repositories, focusing on backend development and database management using PHP and XML. In hallowelt/mediawiki, Mah improved search reliability by refining MySQL full-text boolean-mode parsing, removing problematic hyphen characters to prevent invalid SQL syntax and enhance result accuracy. For SemanticMediaWiki, Mah modernized HTML rendering and strengthened data extraction by replacing deprecated methods, introducing utility helpers, and improving timestamp handling for better cross-version compatibility. Mah also refactored PHPUnit testing infrastructure, aligning test naming and configuration to reduce CI instability. The work demonstrated careful attention to maintainability, compatibility, and robust software testing practices.