Rohan Gupta focused on backend security enhancements for the pennlabs/penn-clubs repository, addressing vulnerabilities in user-generated HTML content. He implemented robust HTML sanitization across Club Applications, Fairs, and Imported Events, introducing new validation methods and a dedicated cleaning utility to ensure all user-provided HTML is safe before rendering. Working primarily with Python and Django, Rohan’s approach reduced the risk of cross-site scripting attacks and improved content integrity throughout member-facing features. His work aligned with security best practices, providing traceable, maintainable improvements that decreased the application’s attack surface and ensured safer handling of dynamic content within the platform.