During September 2025, Alfonso Curbelo focused on stabilizing the expo/expo repository’s prebuild pipeline by addressing a race condition in iOS splash screen asset generation. He resolved the issue by coordinating asynchronous asset generation with Promise.all, ensuring all image assets were created before the prebuild process continued. This targeted fix reduced intermittent build failures and CI noise, improving reliability for developers using Expo. Alfonso applied his expertise in async programming, build systems, and TypeScript to implement the solution, demonstrating a thoughtful approach to concurrency and build stability. The work reflected a deep understanding of Node.js and modern JavaScript development practices.