Contributed to the nestjs/nest repository by delivering two features focused on enhancing cross-platform reliability and maintainability. Developed and streamlined continuous integration workflows using GitHub Actions, enabling automated testing across Ubuntu, Windows, and macOS environments with Node.js 20. Improved the robustness of ECMAScript module loading by converting absolute file paths to URLs with pathToFileURL, addressing platform-specific inconsistencies. The work involved cleaning up outdated CI processes and ensuring comprehensive test coverage by disabling fail-fast behavior. Leveraged TypeScript, YAML, and DevOps practices to align infrastructure with platform-agnostic quality goals, supporting more reliable multi-OS deployments and consistent development workflows.