Worked on enhancing authorization error handling in the mongodb-js/compass repository by replacing unreliable string-based detection with a robust approach using MongoDB error code 13. This update improved the reliability and maintainability of backend authorization checks, reducing the risk of false positives and negatives when identifying unauthorized access. Developed comprehensive tests in TypeScript to validate the new detection logic across a variety of scenarios, ensuring consistent behavior. Included a fallback mechanism that matches error messages for compatibility with legacy cases. Focused on backend development, error handling, and testing, the work strengthened security and resilience in data-service authorization workflows.