Paul Barrillion delivered a secure MongoDB upgrade and enhanced TLS client authentication for the proconnect-gouv/federation repository. He upgraded the database to MongoDB 6.0.17, refactored client tooling, and updated deployment configurations to align with new security standards. Using Docker, Shell scripting, and JavaScript, Paul implemented TLS client authentication across all MongoDB connections, ensuring robust access controls and reducing security risks. His work included validating upgrade changes to minimize production risk and updating Docker configurations for compatibility. This focused engineering effort improved the project’s compliance posture and established a solid foundation for future database upgrades and secure deployment practices.