Key Responsibilities: * API-Focused End-to-End Testing * Own and execute end-to-end API and integration testing for CMS Burden Reduction initiatives * Validate HL7 FHIR-based REST APIs including payloads, schemas, headers, authentication, and error handling * Perform deep API validation across upstream and downstream systems and integration partners * Ensure data accuracy, integrity, and regulatory compliance across API workflows * Agile & Program Enablement * Participate in Pre-PI Planning, PI