Yann Soubeyrand focused on security hardening for the zitadel/zitadel-charts repository, delivering a comprehensive upgrade to the database certificate handling within the ZITADEL Helm chart. He restructured certificate property naming and updated template references to maintain consistency and prevent configuration drift. By introducing a new CA certificate template and removing the legacy root certificate secret template, Yann simplified secret management and improved the security of database connections. His work leveraged DevOps practices and Helm, with extensive use of YAML for configuration. The depth of the changes addressed both maintainability and security, resulting in a more robust deployment process for ZITADEL.