Brenno Passanha enhanced AWS cost analytics by developing tagging features across the awslabs/cid-framework and aws-samples/aws-cudos-framework-deployment repositories. He introduced a 'tags' column to CUR2 data exports, updating Athena schemas to support map<string,string> types for detailed billing analysis. In the following month, Brenno implemented comprehensive Account Tags support, enabling robust data discovery and improved dashboard readiness for cost attribution workflows. His work involved Python, SQL, and AWS Athena, focusing on schema evolution, error handling, and data presentation. The depth of his contributions lies in aligning data models with AWS specifications and ensuring backward-compatible, maintainable cloud infrastructure enhancements.