.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

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