Yannick stabilized layout measurement across the facebook/litho and facebook/react-native repositories by reverting changes that exposed unsnapped dimensions, ensuring layout calculations consistently used snapped dimensions for improved UI reliability. Working primarily in C++ and Java, Yannick addressed regressions and confusing edge cases by aligning measurement logic between Litho and React Native, simplifying the codebase and reducing technical debt. The work involved removing raw dimension exposure, enforcing constraints in the layout system, and streamlining measurement paths, which enhanced maintainability and future-proofed the layout code. This focused bug-fixing effort delivered tangible improvements in UI consistency and cross-platform layout behavior.