Jobs → Engineering → Senior .NET Middleware Developer

About the Role We are seeking a 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. The middleware platform will facilitate secure communication, orchestration, data transformation, and transaction processing between healthcare payer systems, utilization management applications, FHIR-based interoperability platforms, and external healthcare technology partners. 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 .NET Core, ASP.NET Core, C#, REST APIs, and HL7 FHIR. • Experience with healthcare data exchange and distributed application architecture. • Experience implementing healthcare interoperability solutions involving CMS 0057, HL7 FHIR, and Electronic Prior Authorization is highly desirable. • Domain knowledge in US Healthcare / Medicaid / Healthcare Interoperability.