Oleksii contributed to the castai/helm-charts repository by developing a feature that introduced fine-grained cache control for hosted-model deployments. He implemented support for the kv-cache-dtype parameter within the vLLM sub-chart, allowing users to tune cache data types per deployment and thereby influence model performance and memory usage. His work involved updating YAML-based Helm charts, deployment manifests, and documentation to clearly surface the new parameter and its operational impact. Oleksii ensured backward compatibility and adhered to repository standards, demonstrating a focused application of Helm and Kubernetes skills in a targeted, well-scoped engineering effort over the course of one month.