Senior Software Engineer — .NET

About Northern TrustAs 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 & ReactWe 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 ResponsibilitiesBackend (.
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 valueImplement effective data access with Entity Framework Core or comparable tools, minimizing unnecessary reliance on stored proceduresBuild systems that are secure, resilient, auditable, and observableHelp shape architecture decisions and produce clear technical design documentationFrontend (React)Develop modern, responsive interfaces with React and TypeScriptCreate reusable component libraries that follow UI/UX and accessibility standardsIntegrate APIs securely and efficiently, including authentication, authorization, and error handlingImprove frontend performance and the overall user experienceDevelop unit and integration tests for frontend componentsEngineering & DeliveryApply CI/CD best practices with tools such as GitHub Actions / Azure DevOpsChampion test-driven development and automated testingContribute to code reviews, mentoring, and knowledge sharingWork with DevOps, QA, and platform teams to enable reliable deploymentsSupport production systems and assist with incident resolution when requiredRequired

Qualifications:
Essential Technical SkillsAt least 4 years of professional software engineering experienceStrong proficiency in C# and .
NET / ASP.
NET CoreProven experience building micro-frontends (MFEs) with React and TypeScriptStrong knowledge of REST APIs, HTTP fundamentals, and API securityExperience with relational databases such as SQL ServerExperience with cloud platforms, preferably Azure, and containerization with Docker preferred.
Hands on experience with Agentic AI SDLC with spec-driven development a plusEngineering PracticesStrong command of object-oriented design, clean code, and refactoringHands-on experience with unit testing, integration testing, and mocking frameworksFamiliarity with event-driven and microservices architectures; Kafka or other messaging technologies are a plusExperience working in agile delivery environments such as Scrum or KanbanPreferred QualificationsExperience in financial services or another highly regulated industryKnowledge of performance tuning, high-volume transaction processing, and distributed systemsProfessional CapabilitiesStrong analytical and problem-solving abilitiesClear, structured communicationAbility to collaborate effectively with senior stakeholders and cross-functional teamsA proactive approach with strong ownership and accountabilityTechnical Leadership:The successful candidate will demonstrate strong technology leadership, shaping solution design and improving engineering practices across teams:Advance modern engineering practices, including API-first design, cloud-native patterns, automation, and technical debt reductionGuide and mentor engineers to strengthen capabilities and promote consistent practices across teamsIdentify technology risks, scalability issues, and non-functional gaps early, then drive practical solutionsBalance immediate delivery needs with long-term platform health, maintainability, and operational resilienceAlignment with Northern Trust Principles:Successful candidates are expected to reflect Northern Trust’s core principles and values in everyday engineering decisions and practices:Service & Integrity First – Develop software responsibly, with security, accountability, client trust, and data protection at the forefront.
Strength in Collaboration – Partner across engineering, architecture, product, operations, and risk to deliver sustainable, well-designed solutions.
Expertise & Continuous Improvement – Apply deep techni