During September 2025, Alfonso contributed to the expo/expo repository by addressing a stability issue in the prebuild pipeline for iOS. He resolved a race condition affecting splash screen asset generation by coordinating asynchronous operations with Promise.all, ensuring all assets were generated before the prebuild process continued. This targeted fix reduced intermittent build failures and minimized CI noise caused by incomplete asset generation. Alfonso’s work demonstrated a strong grasp of async programming and build systems, utilizing JavaScript and TypeScript to implement a robust solution. The depth of the fix reflects careful analysis and a focused approach to improving the prebuild workflow.