Worked on enhancing reliability and maintainability in large-scale open source projects, focusing on the facebook/relay and facebook/docusaurus repositories. Addressed a critical npm package publishing issue in facebook/relay by updating the publish command to use a relative path, resolving directory misidentification and reducing CI failures. In facebook/docusaurus, stabilized cross-platform command execution by standardizing execa usage and aligning with cross-spawn types, improving tooling consistency for Windows environments. Modernized CodeQL continuous integration by migrating configuration from YAML to GitHub UI settings, simplifying management and increasing analysis reliability. Utilized TypeScript, YAML, and Node.js to deliver robust DevOps and CI improvements.