Charles Luo worked on the hmcts/cnp-plum-recipes-service repository, focusing on validating Redis module upgrades to ensure deployment stability. He developed an integration test for the Redis module v4.x using Infrastructure as Code principles and Terraform, written in HCL, to assess compatibility and deployment readiness. When the upgrade introduced risk, Charles executed a controlled rollback to the stable DTSPO-17012-data-persistency reference, restoring a reliable baseline for data persistence. His work established a clear rollback path and improved confidence in future Redis deployments. The depth of his approach ensured both immediate stability and a foundation for ongoing infrastructure improvements.