Sr Developer, C# .NET & APIs

TransUnion's Job Applicant Privacy Notice Team Overview The team is responsible for designing, developing, and maintaining mission-critical backend applications and services that support TransUnion's data and analytics platforms. These solutions process large volumes of data in real time and enable reliable, scalable products used by customers across multiple industries. This team operates within an Agile Scrum environment and partners closely with Product, Architecture, Data Engineering, QA, and Operations teams to deliver secure, high-quality software. The role reports through the Engineering organization under the Manager of Software Development.

This is a hybrid position and involves regular performance of job responsibilities virtually as well as in-person at an assigned TU office location for a minimum of two days a week. Role Overview And Core Responsibilities The Senior Software Developer is responsible for designing, building, and supporting scalable backend applications that enable business growth, operational efficiency, and product innovation. This role provides technical leadership within the Scrum team while contributing hands-on software development expertise. Design, develop, test, and maintain enterprise-grade backend applications and services using C# and .NET technologies. Lead the implementation of scalable, secure, and high-performing solutions that support large-scale data processing and customer-facing products. Collaborate with Product Owners, Architects, and cross-functional teams to translate business requirements into technical designs and deliverable solutions. Drive improvements in software quality through automated testing, code reviews, continuous integration, and continuous deployment (CI/CD) practices. Participate in architecture discussions and make recommendations regarding application design, performance optimization, scalability, and maintainability. Troubleshoot, analyze, and resolve complex production issues, minimizing business impact and improving system reliability. Mentor junior and mid-level developers by sharing technical knowledge, promoting engineering best practices, and supporting professional development. Contribute to backlog refinement, sprint planning, estimation, and release activities within an Agile Scrum environment. Develop and maintain REST-based APIs and integrations with internal and external systems to support business workflows and customer solutions. Continuously evaluate emerging technologies and recommend solutions that improve development efficiency, application performance, and operational effectiveness. Required Knowledge And Experiences Required Knowledge and Experiences 5+ years of professional software development experience building and supporting enterprise applications, with a strong focus on backend development using object-oriented programming principles.