In January 2026, Amtk developed certificate-based authentication via mutual TLS for the google-auth-library-python repository, focusing on enhancing backend security and API development. Using Python, Amtk implemented dynamic IAM endpoint selection, allowing the library to automatically apply mTLS based on environment variables. This approach ensures that secure endpoints are used appropriately and simplifies configuration for enterprise users. Amtk also added support for an alternative environment variable, enabling users to control mTLS usage through the Gcloud CLI. The work demonstrated a strong understanding of security best practices and delivered a targeted feature that aligns with modern cloud authentication requirements without introducing unnecessary complexity.