Worked on the apache/celeborn repository, delivering both feature development and critical bug fixes over a two-month period. Built NodePort-based external access for Celeborn master replicas, introducing per-master NodePort services with configurable exposure and port settings to enhance integration with Kubernetes networking. Leveraged Helm Charts and YAML to provide flexible deployment options and cloud-native accessibility. Additionally, addressed a cache integrity issue in the TagsManager component using Scala, preventing in-place mutation of cached Sets and ensuring reliable worker discovery across applications. Validated the fix with targeted testing, improving the stability of tag-based scheduling and reducing the risk of stale cache errors.