Senior Software Engineer — .NET & React

About Northern Trust As a global leader in innovative wealth management, asset servicing, asset management and banking services, Northern Trust (Nasdaq: NTRS) is proud to guide the world’s most successful individuals, families, corporations and institutions. Since 1889, we have aligned our efforts with our three guiding Principles That Endure:
Service, Expertise, and Integrity. Together, they reflect the three cornerstones of business conduct which we strive to instill in our employees, whom we call partners, and to provide to our clients and the communities we serve worldwide. With more than 135 years of financial experience and over 24,000 partners, we serve the world’s most sophisticated clients using leading technology and exceptional service.

Role - Senior Software Engineer — .NET & React We are looking for an accomplished Senior Software Engineer to design, develop, and modernize scalable enterprise applications. The role centers on API-first, cloud-native solutions built with .NET (C#) for backend services and React for frontend experiences, with a strong focus on security, performance, maintainability, and sound engineering practices.

You will partner with architects, product owners, and cross-functional teams to deliver reliable software that meets enterprise standards and regulatory obligations.

Primary Responsibilities Backend (.NET)
Design, build, and support RESTful APIs and backend services with .NET / ASP.NET Core (C#)Use clean architecture practices, including SOLID, DDD, and CQRS where they add value

Implement effective data access with Entity Framework Core or comparable tools, minimizing unnecessary reliance on stored procedures

Build systems that are secure, resilient, auditable, and observable

Help shape architecture decisions and produce clear technical design documentation

Frontend (React)
Develop modern, responsive interfaces with React and Type Script Create  reusable component libraries that follow UI/UX and accessibility standards

Integrate APIs securely and efficiently, including authentication, authorization, and error handling

Improve frontend performance and the overall user experience

Develop unit and integration tests for frontend components

Engineering & Delivery Apply CI/CD best practices with tools such as Git Hub Actions / Azure Dev Ops Champion  test-driven development and automated testing

Contribute to code reviews, mentoring, and knowledge sharing

Work with Dev Ops, QA, and platform teams to enable reliable deployments

Support production systems and assist with incident resolution when required

Required Qualifications:

Essential Technical Skills At least 4 years of professional software engineering experience

Strong proficiency in C# and .NET / ASP.NET Core Proven experience building micro-frontends (MFEs) with React and Type Script Strong  knowledge of REST APIs, HTTP fundamentals, and API security

Experience with relational databases such as SQL Server

Experience with cloud platforms, preferably Azure, and containerization with Docker preferred.

Hands on experience with Agentic AI SDLC with spec-driven development a plus Engineering Practices Strong command of object-oriented design, clean code, and refactoring

Hands-on experience with unit testing, integration testing, and mocking frameworks

Familiarity with event-driven and microservices architectures;
Kafka or other messaging technologies are a plus Experience working in agile delivery environments such as Scrum or Kanban

Preferred Qualifications Experience in financial services or another highly regulated industry

Knowledge of performance tuning, high-volume transaction processing, and distributed systems

Professional Capabilities Strong analytical and problem-solving abilities

Clear, structured communication

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