Thibault worked on the facebook/react-native repository, focusing on improving Gradle configuration inheritance for Hermes V1 in large Android monorepos. He addressed a critical bug by updating the settings.gradle.kts file to resolve gradle.properties from parent start parameters, with a fallback to the standard android directory. Using Kotlin and Gradle, Thibault ensured that hermesV1Enabled and react.hermesV1Enabled settings propagate reliably across composite builds, particularly benefiting projects structured under packages/*/android. His work reduced manual configuration and build time friction, especially for Expo SDK 55 integration, and was validated through manual testing in a real monorepo environment before being merged.