During December 2024, William Vela contributed to the aws/aws-k8s-tester repository by refining Elastic Network Interface (ENI) lifecycle management for Kubernetes clusters on AWS. He experimented with enabling DeleteOnTermination for ENIs in unmanaged node groups, aiming to improve resource cleanup when EC2 instances terminate, and carefully evaluated the impact before reverting the change. William also addressed robustness by adding, then reverting, a nil pointer check in the Go-based writeKubeconfig function to prevent exceptions when cluster resources are missing. His work demonstrated thoughtful risk assessment and traceability, leveraging Go, YAML, and AWS CloudFormation to inform future infrastructure as code strategies.