Senior Software Engineer - .NET & React

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 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 technical expertise while continually improving systems through modernization, automation, and proven engineering practices.
• Ownership & Accountability - Own solutions end to end, from design through production support, with consistent attention to reliability and quality.
• Risk & Controls Mindset - Build solutions that satisfy regulatory, compliance, and audit requirements through appropriate controls, logging, and documentation.
• Client-Focused Engineering - Make technology choices that support scalability, resilience, and lasting client outcomes rather than only short-term delivery.

Education and Experience

• Bachelor's or Master's 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.

Work Authorization

Applicants must be authorized to work in the U.S. without the need for employment-based visa sponsorship now or in the future. Northern Trust will not sponsor applicants for U.S. work visa status for this opportunity (no sponsorship is available for H-1B, L-1, TN, O-1, E-3, H-1B1, F-1, J-1, OPT, CPT or any other employment-based visa).

Working with Us

As a Northern Trust partner, you will be part of a flexible and collaborative work culture, which has a strong history of financial strength and stability. Movement within the organization is encouraged, senior leaders are accessible, and you can take pride in working for a company committed to an inclusive workplace and assisting the communities we serve.

Philanthropy is deeply rooted in Northern Trust's history and is an essential element of our culture. Employees around the world give their time and talent to work for the greater good of their communities.