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Senior Software Engineer – (C#, .NET)

Location: West Valley City, Utah

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What makes a Senior Software Engineer – (C#, .NET) successful at OneMain? Check out the top traits we’re looking for and see if you qualify.

  • Adaptable
  • Analytical
  • Curious
  • Entrepreneurial
  • Inventive
  • Problem Solver

Culture

  • We foster an entrepreneurial spirit that's powered by a national brand – our teams are empowered to make a difference
  • We encourage teams to take ownership of initiatives in this fast-paced, innovative culture so they can drive solutions that stay ahead of customer needs
  • We prioritize teamwork and building in-person connections with each other, understanding that fostering a collaborative environment is the best way to support each other.
  • We promote avenues to allow team members to expand their professional capabilities and continuously develop skills, facilitating upward mobility and career progression
Headshot of Andy W.

I like working at OneMain because of the opportunity it provides. You get to work with a lot of talented people, a lot of motivation to better the lives of our customers and a lot of fun technology that you get to interact with on a daily basis. I feel like I have many different options that I can take on yearly.

Andy W., Software Developer

Benefits

  • Blue circular icon with 4 people illustrations

    We promote social and family well-being by offering paid time off for volunteer hours and providing family back-up care.

  • Blue circular icon with open hands holding heart

    We offer extensive, comprehensive coverage to support team members’ needs physically and mentally, such as access to Talkspace and Hinge for on-demand physical therapy via an app.

  • Blue circular icon with piggy bank

    We offer financial wellness that includes 401(k) with match, ESPP, tuition reimbursement and tools like subscription cancelation that help you stay on top of your financial goals.

Senior Software Engineer – (C#, .NET)

Location: West Valley City, UT
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Job Number R2608-52251 Date posted 08/31/2026

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.

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