Senior Software Engineer – (C#, .NET)

Relha LLC; Salt Lake City (UT); On-site; USD 100,000 - 140,000; Full time

Job summary

Relha LLC in Salt Lake City, UT is seeking a senior software engineer to help architect and build enterprise-grade .NET applications, including backend services and customer-facing systems.

You will design scalable APIs, participate in code reviews, and mentor peers while working in an Agile DevOps environment. Experience with WPF/XAML, MVVM, and RESTful APIs is highly valued.

Bachelor's in CS or related field required; strong communication and problem-solving skills expected.

Qualifications

• 3–5+ years of experience developing enterprise-grade applications in .NET.

Responsibilities

• Contribute to the architecture and development of key systems including Loan Origination Systems, Loan Servicing Systems, and customer-facing applications.

Skills

.NET

C#

WPF/XAML

MVVM

LINQ

WebAPI

REST API

JSON

XML

React

Angular

Education

Bachelor's degree in Computer Science or related field

Tools

Visual Studio

Git

Job description

• 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.