Sr Developer, C# .NET & APIs

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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.

Strong understanding of software design patterns, data structures, algorithms, and application architecture, enabling the development of scalable and maintainable solutions.

Experience working in Agile Scrum environments, including sprint planning, backlog grooming, estimation, and iterative delivery of business value.

Experience implementing automated testing and CI/CD practices, ensuring software quality, release reliability, and operational efficiency.

Bachelor's degree in Computer Science, Software Engineering, Information Technology, or related field, or equivalent practical experience, providing the foundational knowledge necessary to design and deliver complex software solutions.

Required Technical Skills

C# and .NET Framework/.NET Core for developing enterprise backend applications and services.

REST (Representational State Transfer) APIs and Web Services, including designing, developing, and integrating service-based architectures.

SQL and relational databases (SQL Server preferred) for data access, performance tuning, and application support.

Git version control and modern development workflows, including branching, pull requests, and collaborative code reviews.

CI/CD (Continuous Integration/Continuous Deployment) tools and practices, such as Azure DevOps, GitHub Actions, Jenkins, or equivalent platforms.

Preferred Skills

We're also looking for the preferred skills below. Whether you are proficient or could use some brushing up, we're happy to support your career development and growth in:

Experience with cloud platforms such as Microsoft Azure, Amazon Web Services (AWS), or Google Cloud Platform (GCP).

Experience building and deploying containerized applications using Docker and Kubernetes.

Knowledge of SOAP and REST web services and enterprise system integrations.

Experience working with large-scale data processing systems and high-volume transactional applications.

Familiarity with observability and monitoring tools, including application performance monitoring, logging, and alerting solutions.

TransUnion Overview:

At TransUnion, we encourage and are committed to creating a real, positive impact and shared sense of purpose within our Workforce for Good, which empowers our people to grow, innovate and contribute to a better future for our communities and customers. We strive to build an environment where our associates are in the driver’s seat of their professional development— while having access to help along the way. We recognize that success comes when our associates thrive both professionally and personally; that’s why we prioritize work/life flexibility and offer resources for our teams across the globe to collaborate and drive excellence.

Be a part of our Workforce for Good – you’ll work with great people, pioneering products and cutting-edge technology.

TransUnion Job Title

Sr Developer, Applications Development