Enterprise data lakehouse delivered for a healthcare client on AWS, unifying data from multiple operational systems (TrakCare, D365, PeopleSoft) via a Medallion architecture (Raw → Curated → Refined → Production) on Redshift Serverless. Built with AWS CDK and orchestrated by Managed Airflow (MWAA) — dbt owns SQL transformations, Lake Formation enforces tag-based governance, and a multi-compute strategy (Glue, Lambda, Batch) matches workload to runtime. Powers self-service BI (Power BI, QuickSight) and is AI/ML-ready.