Jan Müller developed and integrated Kubernetes RBAC enhancements for the build-scaling-console in the zalando-incubator/kubernetes-on-aws repository. He introduced ServiceAccount, ClusterRole, and ClusterRoleBinding scaffolding using YAML, migrating the build-scaling-console to cluster-wide roles and removing namespace scoping to streamline permissions management. Jan expanded read privileges to nodes and statefulsets and refactored node-related permissions, improving both security and auditability for the build-scaling pipeline. His work focused on DevOps and Infrastructure as Code practices, delivering a targeted feature that addressed access control and reliability requirements. The depth of the changes reflects a strong understanding of Kubernetes RBAC and cluster resource management.