Senior Software Engineer .NET

Location: West Valley City, UT

Time Type: Full time

Job Description

OneMain Financial is seeking a Senior Software Engineer – Platform Engineer to design, build, and enhance our core lending platforms, including our proprietary Loan Origination System (LOS), Loan Servicing System (LSS), and multiple high-traffic web properties. This position is based on-site in West Valley City, UT.

The successful candidate will contribute to system design and implementation across platforms that power key customer interactions and enterprise-wide financial services. This engineer will collaborate closely with product teams and cross-functional partners in Legal, Accounting, Finance, Credit, and Marketing.

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.

Who we Are

OneMain Financial (NYSE: OMF) is the leader in offering nonprime customers responsible access to credit and is dedicated to improving the financial well-being of hardworking Americans. Since 1912, we’ve looked beyond credit scores to help people get the money they need today and reach their goals for tomorrow. Our growing suite of personal loans, credit cards and other products help people borrow better and work toward a brighter future.

Driven collaborators and innovators, our team thrives on transformative digital thinking, customer-first energy and flexible work arrangements that grow lives, careers and our company. At every level, we’re committed to an inclusive culture, career development and impacting the communities where we live and work. Getting people to a better place has made us a better company for over a century. There’s never been a better time to shine with OneMain.

Because team members at their best means OneMain at our best, we provide opportunities and benefits that make their health and careers a priority. That’s why we’ve packed our comprehensive benefits package for full- and some part-timers with: 

• Health and wellbeing options including medical, prescription, dental, vision, hearing, accident, hospital indemnity, and life insurances 
• Up to 4% matching 401(k)   
• Employee Stock Purchase Plan (10% share discount)   
• Tuition reimbursement   
• Paid time off (15 days’ vacation per year, plus 2 personal days, prorated based on start date) 
• Paid sick leave as determined by state or local ordinance, prorated based on start date 
• Paid holidays (7 days per year, based on start date) 
• Paid volunteer time (3 days per year, prorated based on start date) 

OneMain Holdings, Inc. is an Equal Employment Opportunity (EEO) employer. Qualified applicants will receive consideration for employment without regard to age, ancestry, citizenship status, color, creed, culture, disability, ethnicity, gender, gender identity or expression, genetic information or history, marital status, military status, national origin, nationality, pregnancy, race, religion, sex, sexual orientation, socioeconomic status, transgender or on any other basis protected by law.