Developed dynamic environment variable resolution for extension configurations in both the google-gemini/gemini-cli and zed-industries/gemini-cli repositories, enabling standardized, environment-aware deployments across multiple projects. Leveraging Node.js and TypeScript, implemented a robust system that resolves environment variables within configuration files, reducing manual errors and supporting multi-environment workflows. Comprehensive test coverage was added to verify correct resolution across various formats and to ensure graceful handling of missing variables, improving reliability and maintainability. The work focused on full stack development and environment variable management, resulting in a consistent approach to configuration that streamlines deployment processes and minimizes configuration-related issues.