Worked on the awslabs/landing-zone-accelerator-on-aws repository to enhance the reliability of Gateway Load Balancer endpoint associations in multi-account AWS environments. Focused on refining the endpoint filtering logic using TypeScript and AWS CloudFormation, ensuring that only endpoints from the current account are included and eliminating duplicates to prevent misrouting and configuration drift. This update did not introduce new features but addressed a critical bug, improving the stability and maintainability of network associations. The work strengthened cross-account networking integrity and reduced the risk of misconfiguration, demonstrating a methodical approach to cloud infrastructure reliability and scalable deployment practices.