Worked on the cartography-cncf/cartography repository to enhance the reliability and performance of AWS EMR synchronization. Addressed a bug in the backend Python codebase by updating error handling for SubscriptionRequiredException, ensuring that regions requiring an active EMR subscription are now skipped rather than retried. This change reduced unnecessary retry loops and improved sync latency by approximately ten minutes per affected region. The solution aligned error handling with existing access-denied patterns and was validated through comprehensive unit testing. The work demonstrated a strong focus on AWS integration, backend development, and rigorous testing practices to improve operational efficiency and maintainability.