Jan contributed to the castai/k8s-agent and castai/helm-charts repositories by building monitoring features for Kubernetes ResourceQuotas and LimitRanges, using Go and Kubernetes controller informers to enable proactive visibility into resource constraints. Jan enhanced RBAC configurations in Helm charts, allowing the castai-agent to collect richer resource utilization data across clusters. The work included updating test suites to ensure accurate reporting and integrating changes with Helm deployments for improved security and data collection. Additionally, Jan fixed namespace handling in the Pod Mutator Helm chart, aligning deployment behavior with best practices and reducing environment-specific issues, demonstrating depth in backend development and system monitoring.