Principal .NET Engineer (Distributed Systems / Banking Integration)

We are seeking an experienced Senior .NET/Integration Developer to build the connective tissue of a new digital banking ecosystem for a major Credit Union. This role is ideal for a hands-on engineer who thrives in cross-functional teams and has strong experience developing backend APIs, orchestrating data routing between digital platforms (VeriPark), core banking systems (Fiserv), and third-party endpoints. What You'll Do Design, develop, and maintain secure, high-performance REST API and service integrations across the VeriLink integration layer. Coordinate directly with vendors (Fiserv, VeriPark) and internal teams to execute complex core banking integrations. Support extensive integration testing activities, including System Integration Testing (SIT), regression, and end-to-end validation. Assist in the deconversion and retirement of legacy platforms (Forge 2.0), ensuring clean data archiving and member continuity. Collaborate with product managers, designers, architects, and developers in Agile delivery teams. Required Qualifications 5+ years of recent experience in senior software development roles. Strong backend development experience with .NET, C#, and enterprise application integration. Extensive hands-on experience building and consuming RESTful APIs and working with OpenAPI standards. Experience with Microservices architecture and continuous integration pipelines. Strong database experience and knowledge of data mapping/reconciliation. Nice to Have Familiarity with Fiserv core banking platforms or VeriPark solutions. Experience in the financial services sector and handling legacy system deconversions. Experience working with cloud platforms such as Microsoft Azure. What We Offer Opportunity to work on impactful, large-scale modernization initiatives. Collaborative and supportive engineering culture. Exposure to modern cloud-native technologies and platforms. Flexible and dynamic remote delivery environment.