Worked on the Kajabi/sage-lib repository to enhance the stability and resilience of UI components by addressing issues related to null dereferences and transient DOM states. Focused on improving popover behavior and overlay dismissal reliability, the work involved auditing and refactoring multiple modules to introduce targeted null guards and safety checks. Using JavaScript and TypeScript, along with DOM APIs such as closest and querySelector, the developer consolidated defensive programming patterns across five components. These changes reduced runtime errors in the Admin interface and improved maintainability, ensuring that UI modules behave reliably even when elements are missing or in unexpected states.