Worked on security hardening for the grafana/oncall repository by upgrading the Redis Docker image from version 7.0.5 to 7.0.15 across all Docker Compose configurations. This update addressed critical vulnerabilities, including integer overflows, denial-of-service risks, and potential heap overflows, thereby improving the reliability and security posture of the on-call tooling. The work involved careful modification of YAML configuration files and validation of build and deployment processes to ensure readiness for production use. Leveraging DevOps and security expertise, the developer focused on proactive risk mitigation, delivering a targeted feature that enhanced the project’s infrastructure without introducing new bugs.