Senior Software Engineer – (C#, .NET)

Posted Yesterday
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Salt Lake City, UT, USA
In-Office
Senior level
Fintech
The Role
Develop and maintain scalable enterprise systems, including loan origination, servicing, and customer-facing applications. Design APIs, middleware, integrations, and secure backend services; participate in code reviews, architecture discussions, automation, CI, legacy modernization, troubleshooting, and performance tuning. Collaborate across teams in an Agile and DevOps environment while mentoring peers and promoting modern development practices.
Summary Generated by Built In

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.

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.

Skills Required

  • 3-5+ years of experience developing enterprise-grade applications in .NET
  • Strong skills in T-SQL, C#, and the .NET Framework
  • Experience with backend service design
  • Understanding of distributed systems and multi-tier application architectures
  • Hands-on experience with WPF/XAML, LINQ, MVVM, and WebAPI
  • Experience with 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 a related field
  • Interest in mentoring peers and promoting modern development practices
  • Exposure to React or Angular

OneMain Financial Compensation & Benefits Highlights

The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about OneMain Financial and has not been reviewed or approved by OneMain Financial.

  • Retirement Support Retirement benefits include a 401(k) with a dollar-for-dollar match up to 4% after six months, supporting long-term savings. An employee stock purchase plan with a 10% discount adds another ownership-oriented reward element.
  • Leave & Time Off Breadth Time-off offerings include vacation that can grow to five weeks, paid holidays, personal days, sick time, and three paid volunteer days. Paid parental leave is offered at 100% pay for six weeks, adding to the overall leave mix.
  • Flexible Benefits A broad menu of benefits spans HSAs/FSAs, disability coverage, life and long-term care solutions, tuition reimbursement, and voluntary options like pet insurance and legal assistance. Backup child/elder care and adoption assistance further widen the set of selectable supports.

OneMain Financial Insights

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The Company
HQ: Baltimore, Maryland
5,386 Employees
Year Founded: 1912

What We Do

OneMain provides personal loans with one on one, local service at branches nationwide. Our personalized loan solutions offer customers a simple and straightforward loan application, fixed rates, fixed payments, clear terms and multiple payment options.

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