This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a .NET Integration Engineer — FHIR Hub Ingestion based in United States. This is a hands-on integration engineering role focused on building a reliable healthcare data ingestion pipeline from authenticated FHIR APIs to downstream enterprise systems. You will design and develop production-grade .NET services that handle authentication, data retrieval, persistence, transformation, and secure delivery. The work combines modern healthcare APIs with the exacting requirements of legacy file-based consumers, including fixed-width, delimited, and XML formats. You will collaborate closely with client subject matter experts to translate business and technical requirements into durable integration solutions. Reliability is central to the role, with an emphasis on idempotency, restartability, reconciliation, monitoring, auditability, and recoverable failures. You will also contribute to secure file delivery, antivirus scanning, operational documentation, and implementation runbooks. This is an excellent opportunity for an experienced .NET integration engineer to apply strong systems and data engineering skills to a complex healthcare environment.