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# NET Middleware Developer

- **Company:** Innovity Incorporated
- **Location:** Des Moines, IA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** ASP.NET, .NET Framework, Application Programming Interfaces (APIs), Amazon Web Services, Microsoft Azure, C Sharp (Programming Language), Relational Databases, Distributed Systems, Middleware, Interoperability, JSON, Microsoft SQL Server, Medicaid Management Information Systems (MMIS), OAuth, Simple Data Format, Software Engineering, Systems Integration, Extensible Markup Language (XML), File Transfer Protocol (FTP), Fast Healthcare Interoperability Resources, Git, Containerization, Enterprise Integration, Integration Frameworks, Asynchronous Programming, Restful APIs, Docker, Legacy Systems, Microservices
- **Published:** October 18, 2026
- **Apply:** https://www.careerjet.com/jobad/us434f5aa9e1c7370307430406df57646f

## About the Role

* 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

 4. 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.

## Description

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.