Worked on security hardening for the BuilderIO/builder repository, focusing on improving event origin validation within the frontend codebase. Addressed a critical bug by updating the isTrustedHostForEvent logic in TypeScript to explicitly reject events originating from null origins, thereby reducing the risk of processing untrusted sources. This targeted change enhanced the security posture of the application without introducing regressions, as validation checks were performed to ensure stable event handling. The work emphasized maintainability and traceability through clear, descriptive commits. Leveraged frontend development and security expertise to deliver a concise, effective solution that strengthened the repository’s event-handling safeguards.