OneMain Financial Jobs

At T-Mobile, we invest in YOU! Our Total Rewards Package ensures that employees get the same big love we give our customers. All team members receive a competitive base salary and compensation package - this is Total Rewards. Employees enjoy multiple wealth-building opportunities through our annual stock grant, employee stock purchase plan, 401(k), and access to free, year-round money coaches. That's how we're UNSTOPPABLE for our employees! Job Overview: We are looking for a highly skilled Senior Software Engineer to join the T-Life Backend Engineering team. This team builds and scales the core backend systems that power T-Mobile's customer-facing mobile experiences, including the T-Life app. In this role, you will develop Java-based microservices and APIs that support millions of users-enabling scalable, secure, AI-enhanced, and high-performance experiences across T-Mobile's digital ecosystem. The ideal candidate brings strong Java expertise, deep knowledge of cloud-native engineering practices, and experience deploying resilient services in production. We are also seeking engineers who actively leverage AI-assisted development tools to accelerate delivery, improve code quality, and drive engineering efficiency. Job Responsibilities: Technical Engineering Lead the design and development of scalable Java microservices supporting mobile feature delivery at high scale. Build secure, reliable APIs consumed by iOS, Android, and web/internal systems. Write clean, maintainable code backed by comprehensive unit, integration, and contract tests. Ensure code meets high standards for performance, reliability, observability, and security. Collaborate with system engineers to align backend data flows, service contracts, and integration patterns. Provide mentorship and conduct regular code reviews to promote technical excellence. Use AI-based development tools (e.g., AI pair programming, automated refactoring, intelligent code generation) to speed up development cycles, enhance code quality, and reduce manual effort. Innovation & Platform Maturity Drive platform-level improvements in event streaming, configuration management, and service health visibility. Explore and adopt emerging technologies, including AI-driven developer tooling, that reduce latency, simplify deployments, or enhance resilience. Identify opportunities for refactoring or architecture modernization aligned with API-first, mobile-first principles. Champion the use of AI for tasks such as documentation generation, test creation, triage automation, and code optimization. Cross-Functional Collaboration Partner with mobile engineers to define backend contracts and troubleshoot client-service interactions. Work closely with Product, QA, and UX teams to ensure backend APIs meet functionality and experience requirements. Participate in PI planning, sprint ceremonies, and cross-functional release activities across the T-Life ecosystem. Collaborate with teams to identify high-impact use cases for AI that improve delivery velocity and operational efficiency. Technical Documentation & Communication Create clear, comprehensive technical documentation for backend services, API contracts, and architectural patterns. Contribute to internal design documents, Confluence resources, and onboarding guides. Leverage AI tools to assist in generating and maintaining high-quality documentation. Education and Work Experience: Bachelor's degree in Computer Science, Engineering, or related technical field (or equivalent practical experience) Knowledge, Skills and Abilities: Required Skills & Experience 7+ years in backend or platform engineering, primarily using Java (8+) Proven experience building and scaling RESTful APIs Strong understanding of microservice architecture, event-driven systems, and distributed service orchestratio