NET Middleware Developer

A. Middleware Development & Integration

• Design and develop scalable middleware applications using C#, .NET 8+, and ASP.NET Core.

• Develop RESTful APIs and integration services connecting multiple healthcare applications.

• Build orchestration services coordinating transactions across payer systems, UM platforms, and interoperability APIs.

• Implement synchronous and asynchronous communication mechanisms.

• Develop configurable transformation services supporting JSON, XML, CSV, and flat-file formats.

• Build file-based integration services supporting SFTP transfers, file validation, acknowledgments, and exception handling.

• Implement transaction tracking, retry mechanisms, error handling, and reconciliation processes.

• Develop reusable integration components supporting multiple Medicaid state implementations.

• C# Expert
• .NET 8+ / ASP.NET Core Expert
• REST API development Expert
• Microservices architecture Strong
• JSON / XML / CSV processing Strong
• SFTP and flat-file integrations Strong
• API orchestration Strong
• SQL Server / relational databases Strong
• OAuth 2.0 / JWT Strong
• Git / Azure DevOps Strong
• CI/CD pipelines Strong
• Docker / containerization Preferred
• HL7 FHIR R4 Preferred
• Healthcare EDI / X12 Preferred
• Azure / AWS Preferred
• Distributed messaging / queues Preferred

1. Healthcare Domain Knowledge Highly desirable:

• US Medicaid and Medicaid Management Information Systems (MMIS)

• Healthcare payer operations

• Prior authorization workflows

• Utilization management systems

• CMS Interoperability and Prior Authorization Final Rule (CMS-0057-F)

• HL7 FHIR R4

• Da Vinci CRD, DTR, and PAS implementation guides

• Provider-to-payer integration workflows

• Healthcare API and legacy application interoperability

Experience working with multiple healthcare vendors and integrating legacy payer systems with modern FHIR APIs will be a significant advantage. An ideal candidate will have:

• 10+ years of professional software development experience.

• 9+ years of hands-on .NET / C# development.

• 5+ years of API and enterprise integration development.

• Experience integrating legacy applications with modern REST APIs.

• Strong understanding of distributed systems and integration patterns.

• Prior experience in US healthcare payer or Medicaid environments.

• Ability to independently own middleware components from design through deployment.