Worked on the aws/aws-k8s-tester repository to refine Elastic Network Interface (ENI) lifecycle management, focusing on resource cleanup and deployment stability. Implemented and later reverted the DeleteOnTermination setting in unmanaged-nodegroup-efa.yaml, carefully evaluating its impact on EC2 resource handling. Addressed robustness by adding, then reverting, a nil pointer check in the writeKubeconfig function to prevent exceptions when cluster resources are absent. All changes were tracked through clear commit history, supporting traceability and rollback planning. Utilized Go and YAML to manage infrastructure as code, applying AWS and Kubernetes expertise to inform decisions around error handling and resource lifecycle expectations.