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 TypeScript
- 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 GitHub Actions / Azure DevOps
- Champion test-driven development and automated testing
- Contribute to code reviews, mentoring, and knowledge sharing
- Work with DevOps, 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 TypeScript
- 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
- Ability to collaborate effectively with senior stakeholders and cross-functional teams
- A proactive approach with strong ownership and accountability
Technical 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 reduction
- Guide and mentor engineers to strengthen capabilities and promote consistent practices across teams
- Identify technology risks, scalability issues, and non-functional gaps early, then drive practical solutions
- Balance immediate delivery needs with long-term platform health, maintainability, and operational resilience
Alignment with Northern Trust Principles:
Successful candidates are expected to reflect Northern Trusts core principles and values in everyday engineering decisions and practices:
- Service & Integrity First 6 Develop software responsibly, with security, accountability, client trust, and data protection at the forefront.
- Strength in Collaboration 6 Partner across engineering, architecture, product, operations, and risk to deliver sustainable, well-designed solutions.
- Expertise & Continuous Improvement 6 Apply deep technical expertise while continually improving systems through modernization, automation, and proven engineering practices.
- Ownership & Accountability 6 Own solutions end to end, from design through production support, with consistent attention to reliability and quality.
- Risk & Controls Mindset 6 Build solutions that satisfy regulatory, compliance, and audit requirements through appropriate controls, logging, and documentation.
- Client-Focused Engineering 6 Make technology choices that support scalability, resilience, and lasting client outcomes rather than only short-term delivery.
Education and Experience:
- Bachelors or Masters degree in Computer Science, Engineering, or a related field, or equivalent practical experience
Salary Range:
$114,500 - 194,700 USD
Salary range is a good faith estimate of base pay. Northern Trust provides a comprehensive benefits package including retirement benefits (401k and pension), health and welfare benefits (medical, dental, vision, spending accounts and disability), paid time off, parental and caregiver leave, life & accident insurance, and other voluntary and well-being benefits. Northern Trust also provides a discretionary bonus program that may include an equity component.
