Senior Software Engineer – .NET, React

Northern Trust

. Design, develop, and modernize scalable enterprise applications .

Posted 10/15/2026full-timeChicago • Illinois • United StatesSenior💰 $114,500 - $194,700 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and developing scalable enterprise applications using C# and .NET / ASP.NET Core, while applying clean architecture principles and ensuring secure API integrations. Proficient in modern frontend development with React and TypeScript, alongside strong capabilities in unit testing and CI/CD practices.

Highest-signal resume keywords

C# ProgrammingASP.NET Core DevelopmentReact and TypeScript DevelopmentREST API Design and SecurityCI/CD Best Practices

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

C#ASP.NET CoreReactTypeScriptREST APIsEntity Framework CoreUnit TestingIntegration TestingMicroservices ArchitecturePerformance Tuning

Soft Skills

Analytical Problem-SolvingClear CommunicationCollaboration with StakeholdersMentoring and Knowledge Sharing

Tools & Technologies

GitHub ActionsAzure DevOpsDockerSQL ServerKafka

Industry Keywords

Financial ServicesRegulatory ComplianceAgile DeliveryCloud PlatformsEvent-Driven Architecture

Tech Stack

Tools & technologies

ASP.NETAzureCloudDistributed SystemsDockerEntity FrameworkKafkaMicroservicesReactSDLCSQLTypeScript.NET

About the role

Key responsibilities & impact

Design, develop, and modernize scalable enterprise applications
Design, build, and support RESTful APIs and backend services with .NET / ASP.NET Core (C#)
Apply clean architecture practices, including SOLID, DDD, and CQRS where valuable
Implement effective data access with Entity Framework Core or comparable tools
Build secure, resilient, auditable, and observable systems
Shape architecture decisions and produce technical design documentation
Develop modern, responsive interfaces with React and TypeScript
Create reusable component libraries following UI/UX and accessibility standards
Integrate APIs securely and efficiently, including authentication, authorization, and error handling
Improve frontend performance and user experience
Develop unit and integration tests for frontend components
Apply CI/CD best practices using tools such as GitHub Actions and Azure DevOps
Champion test-driven development and automated testing
Contribute to code reviews, mentoring, and knowledge sharing
Collaborate with DevOps, QA, and platform teams to enable reliable deployments
Support production systems and assist with incident resolution
Advance API-first design, cloud-native patterns, automation, and technical debt reduction
Guide and mentor engineers and promote consistent engineering practices
Identify technology risks, scalability issues, and non-functional gaps and drive solutions
Balance delivery needs with long-term platform health, maintainability, and operational resilience
Own solutions end to end from design through production support while meeting security, regulatory, compliance, and audit requirements

Requirements

What you’ll need

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
Containerization with Docker preferred
Hands-on experience with Agentic AI SDLC with spec-driven development a plus
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
Experience working with Kafka or other messaging technologies is a plus
Experience in agile delivery environments such as Scrum or Kanban
Experience in financial services or another highly regulated industry preferred
Knowledge of performance tuning, high-volume transaction processing, and distributed systems preferred
Strong analytical and problem-solving abilities
Clear, structured communication
Ability to collaborate effectively with senior stakeholders and cross-functional teams
Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field, or equivalent practical experience
Applicants must be authorized to work in the U.S. without the need for employment-based visa sponsorship now or in the future

Benefits

Comp & perks

Retirement benefits (401k and pension)
Health and welfare benefits, including medical, dental, vision, spending accounts and disability
Paid time off
Parental and caregiver leave
Life and accident insurance
Other voluntary and well-being benefits
Discretionary bonus program that may include an equity component
Flexible and collaborative work culture
Internal mobility opportunities
Inclusive workplace
Reasonable accommodations during the employment process