Jobs → Engineering → Senior .NET Middleware Developer

About the Role We are seeking an experienced Senior .NET Middleware Developer to design, develop, integrate, and support middleware services for a large-scale healthcare interoperability program supporting multiple US Medicaid state implementations. Key Responsibilities • 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 Requirements • 7-12 years of experience in .NET development • Strong technical expertise in API integrations, healthcare data exchange, and distributed application architecture • Experience implementing healthcare interoperability solutions involving CMS 0057, HL7 FHIR, and Electronic Prior Authorization • Experience with healthcare payer systems, utilization management applications, and FHIR-based interoperability platforms