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Senior Software Engineer (.NET/C#)

Onemain — United States · Posted ~13 hours ago

Senior Full-time

Skills

C# .NET .NET Framework T-SQL Backend Service Design API Development Middleware Software Architecture Distributed Systems Performance Tuning Continuous Integration REST APIs

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Summary ✨ AI‑Generated

A senior .NET engineering position focused on enterprise-grade backend applications and secure, maintainable architecture. You will build APIs and middleware, work with C#, T-SQL, and distributed systems, contribute to CI and automation, modernize legacy technology, and troubleshoot performance issues.

Highlights

Work on secure, scalable enterprise systems while contributing to architecture, APIs, integrations, automation, and modernization initiatives. The role includes collaborative engineering practices such as code reviews, design discussions, and pairing, with opportunities to improve system performance and reliability.

Description

Key Responsibilities Contribute to the architecture and development of key systems including Loan Origination Systems, Loan Servicing Systems, and customer-facing applications (e.g., omfauto.com, foursight.com, rateworks.com). Ensure scalable, maintainable, and secure software design within assigned projects. Implement APIs, middleware services, and integrations with internal and external tools such as Twilio Flex. Collaborate with peers through code reviews, design discussions, and pairing sessions. Support automation and continuous integration strategies to improve development efficiency and reliability. Assist in technical initiatives to modernize legacy systems and improve scalability. Participate in troubleshooting and performance tuning to maintain system health. What Sets You Apart 3–5+ years of experience developing enterprise-grade applications in .NET.Strong skills in T-SQL, C#, and the .NET Framework with experience in backend service design.Understanding of distributed systems and multi-tier application architectures.Hands-on experience with WPF/XAML, LINQ, MVVM, and WebAPI; exposure to React or Angular is a plus.Proficiency in RESTful API design, JSON, and XML integrations.Ability to explain technical concepts clearly across teams.Experience working in Agile environments with DevOps practices.Bachelor’s degree in Computer Science, Engineering, or related field.Interest in mentoring peers and promoting modern development practices.