OneMain Financial is seeking Staff Engineer – Platform Architect to shape and enhance the architecture and delivery of 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. This is a critical leadership role within the technology organization. The successful candidate will own system design and implementation across platforms that power key customer interactions and enterprise-wide financial services. This engineer will lead by example—mentoring peers, partnering with product teams, and collaborating cross-functionally with Legal, Accounting, Finance, Credit, and Marketing leaders. **Key Responsibilities** + Own the end-to-end architecture and technical delivery of key systems including LOS, LSS, and major customer-facing applications (e.g., omfauto.com, foursight.com, rateworks.com). + Act as technical authority across domains—ensuring scalable design, reusable patterns, and adherence to secure development practices. + Lead the design and implementation of APIs, middleware services, and integrations with third-party tools such as Twilio Flex. + Mentor junior engineers through code reviews, architectural discussions, and hands-on pairing. + Identify and implement automation and continuous integration strategies to improve development velocity and quality. + Propose and lead technical initiatives that modernize legacy systems and improve scalability. + Proactively mitigate operational risk by anticipating infrastructure or application-level issues. **What Sets You Apart** + 6-8 years of experience with increasing responsibility, including architecting mission-critical applications in .NET. + Deep fluency in C#, .NET Framework, and T-SQL—with the ability to design robust, performant backend systems. + Experience designing distributed systems using SOA principles and multi-tier architectures. + Expertise in WPF/XAML, LINQ, MVVM, and WebAPI development, with exposure to modern frameworks like React and Angular. + Proficiency in API development and integration (REST, JSON, XML) and internal service orchestration. + Ability to communicate architectural decisions clearly across technical and non-technical audiences. + Strong grasp of Agile delivery and DevOps principles. + Bachelor’s degree in Computer Science, Engineering, or related field (Master’s preferred). + Experience mentoring developers and championing clean code, reusability, and modern architectural patterns. OneMain Holdings, Inc. is an Equal Employment Opportunity (EEO) and Affirmative Action (AA) employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender perception or identify, national origin, age, marital status, protected veteran status, or disability status.