Worked on enhancing developer tooling and test reliability across two major open source projects. In the biomejs/biome repository, developed a feature in Rust to improve Language Server Protocol project root selection, introducing logic to prioritize the most specific root in nested workspaces for more accurate project resolution. Later, contributed to vitest-dev/vitest by implementing a TypeScript-based readiness assurance system for browser orchestrators, adding checks and gating mechanisms to ensure tests only start when the environment is fully prepared. This approach reduced flaky test outcomes and improved stability in both CI and local environments, demonstrating a focus on robust, maintainable engineering solutions.