Dimitri Kirchner delivered deployment security hardening for the mdn/yari repository by configuring Cloud Functions to use per-environment non-default service accounts across production, staging, and testing. This approach enforced the principle of least privilege, reducing the potential blast radius and improving auditability within automated CI/CD pipelines. Dimitri utilized YAML to define infrastructure changes and applied DevOps and Cloud Engineering best practices to align with organizational security standards. The work addressed a deployment security misconfiguration, strengthened IAM governance, and ensured that each environment operated with appropriately scoped permissions, reflecting a focused and in-depth contribution to the project’s security posture.