Marie Jeammet upgraded the Dimail service within the suitenumerique/people repository, focusing on backend development and Docker-based deployment. She updated the Docker image tag in the docker-compose.yml file to roll out version v0.1.1, ensuring a smooth and controlled upgrade process. To maintain data integrity and support downstream processing, she preserved the 'uuid' field in mailbox data during serialization. Her work demonstrated careful version control and clear documentation, aligning with CI/CD best practices. Using Python and YAML, Marie delivered a targeted feature that improved service reliability and prepared the system for future scalability, reflecting a focused and methodical engineering approach.