API Developer, .Net

.NET API Developer - CMS Interoperability Location:Remote (U.S. Based) Duration:9 Months (with potential extension) Type:Contract (W-2 or C2C) Project Overview: Our client (confidential - healthcare payer) is seeking a highly specialized developer to support their CMS Interoperability Mandate project. This role will focus on building, securing, and supporting FHIR-based APIs for Patient Access, Prior Authorization, and Payer-to-Payer data exchange. The ideal candidate will have deep experience with Azure Health Data Services (AHDS), FHIR R4/HL7 implementation, and .NET 8 API development within a payer or healthcare data environment. Key Responsibilities: • Design and develop RESTful APIs in C#/.NET 8 that comply with FHIR R4 standards and CMS interoperability requirements • Deploy, manage, and optimize FHIR services using Azure Health Data Services (AHDS) • Configure Azure components including API Management (APIM), Functions, and Active Directory (AD) for secure API delivery • Implement SMART on FHIR protocols and OAuth2 authentication models • Collaborate across compliance, security, DevOps, and product teams to ensure standards alignment • Conduct API testing and documentation using tools such as Postman, Swagger, and OpenAPI • Support payer data integration and interoperability between health plans and external systems Must-Have Skills: • 5+ years of professional experience with .NET (C#), including .NET 6 or 8 • Hands-on experience building FHIR R4 APIs and working with HL7 v2/v3 data formats • Strong working knowledge of Azure Health Data Services and FHIR deployment in Azure • Expertise in Azure API Management, Azure Functions, and Azure AD • Experience implementing SMART on FHIR and OAuth2 authentication • Familiarity with healthcare payer data and claims integration • Excellent troubleshooting, API testing, and CI/CD (Azure DevOps) experience Nice to Have: • Experience with Azure DevOps pipelines for CI/CD automation • Familiarity with CMS compliance frameworks and regulatory reporting • Knowledge of payer systems (e.g., Facets, QNXT) or EHR integration Apply tot his job Apply To this Job