During March 2025, Andre Coelho focused on improving cross-environment reliability for the rocicorp/mono repository by addressing runtime errors related to window event listeners in Expo deployments. He implemented safer event handling in JavaScript and TypeScript by using optional chaining when accessing addEventListener and removeEventListener, ensuring that code would not fail when window was undefined or lacked these methods. This approach reduced crash risks and support issues for both web and React Native environments, enhancing overall stability. Andre’s work demonstrated a solid understanding of frontend development patterns and contributed to more robust, maintainable builds across diverse deployment contexts.