Worked on security hardening for the CSS pipeline in the webiny-js repository, focusing on preventing sensitive filesystem paths from leaking into production bundles. Developed and integrated a custom PostCSS plugin that strips leftover @source directives from all CSS output, including styles imported via JavaScript such as those used by the Lexical editor. This solution complemented the existing Tailwind v4 processing flow with minimal disruption to build steps, maintaining performance and CI compatibility. Leveraged skills in CSS, PostCSS, and front end development to deliver a targeted feature that closed a documented security issue and improved the maintainability of the CSS pipeline.