In March 2025, André 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 robust event handling in JavaScript and TypeScript, using optional chaining to safely access addEventListener and removeEventListener methods when the window object might be undefined or missing these methods. This approach reduced crash risks and support issues, ensuring more stable builds across web and React Native platforms. André’s work demonstrated a strong understanding of frontend development patterns and contributed to more reliable user and developer experiences in complex Expo environments.