Worked on stabilizing the React Native iOS build pipeline in the facebook/react-native repository, focusing on compatibility with Xcode 26. Addressed a critical build issue by replacing deprecated tgmath.h headers with cmath and adding missing string imports, ensuring smoother integration with updated toolchains. Utilized C++, Objective-C++, and iOS development expertise to resolve build breakages that previously hindered continuous integration reliability. This targeted bug fix eliminated a legacy blocker, enabling faster Xcode upgrades and improving developer productivity for iOS projects. The work demonstrated careful header management and cross-language build hygiene, laying groundwork for more seamless future upgrades in the React Native ecosystem.