Senior Software Engineer – (C#, .NET)

OneMain Financial • Salt Lake City, UT

4d

About The Position

OneMain Holdings, Inc. is seeking a Senior Software Engineer with expertise in C# and .NET to contribute to the architecture and development of key systems. This role involves working on Loan Origination Systems, Loan Servicing Systems, and customer-facing applications. The engineer will ensure scalable, maintainable, and secure software design, implement APIs and middleware services, and collaborate with peers through code reviews and design discussions. The position also supports automation, continuous integration, and technical initiatives to modernize legacy systems. Troubleshooting and performance tuning are also key aspects of the role. OneMain Holdings, Inc. is an Equal Employment Opportunity (EEO) employer.

Requirements

• 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.
• 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.

Nice To Haves

• Exposure to React or Angular is a plus.
• Interest in mentoring peers and promoting modern development practices.

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 This Job Offers

• Job Type: Full-time
• Career Level: Senior