Julien Doutre enhanced the DataDog/dd-trace-rb repository by implementing secure Docker image signing and traceability within the CI/CD pipeline. He introduced a new continuous integration step that signs Docker images after they are pushed, leveraging GitLab CI and Docker technologies. Authentication with the signing service was configured using an ID token, ensuring that each image’s provenance is auditable and reducing supply chain risks. Julien’s work, primarily using YAML for pipeline configuration, improved release integrity and compliance readiness. Over the course of the month, he focused on building this feature, demonstrating depth in CI/CD automation and secure software delivery practices.