Worked on enhancing upgrade reliability for Kubernetes clusters by addressing a critical scheduling issue in the derailed/cilium repository. Focused on the Cilium Operator, the developer implemented a targeted bug fix that introduced Kubernetes taints to prevent deployments on drained nodes during cluster upgrades. This approach eliminated upgrade-blocking scenarios caused by rescheduling on nodes that should not accept new workloads, thereby reducing downtime and improving upgrade predictability. The solution leveraged DevOps practices and Helm for deployment management, utilizing YAML and RST for configuration and documentation. The work demonstrated a practical application of Kubernetes taints and tolerations within operator deployment logic.