About the Team/Role
WEX is seeking a Software Development Engineer 3 (Full Stack) to join our Health & Benefits Platform technology team.
In this role, you will design, build, and deliver scalable microservices and modern web applications that power our next-generation benefits experience.
You’ll be a senior-level contributor collaborating across teams to build event-driven systems, reusable frameworks, and user-focused solutions using C# .NET, Kafka, and React within a microservice architecture deployed to the cloud.
How you'll make an impact
Lead the development of complex features spanning backend and frontend components.
Apply deep technical expertise to design and implement clean, maintainable, and performant code.
Mentor less experienced engineers and contribute to team design standards.
Partner with architects and product managers to define scalable solutions aligned with the platform’s long-term strategy.
Ensure that code quality, observability, and maintainability are embedded throughout the software delivery lifecycle.
Design and develop C# .NET Core microservices that support domain-driven architecture.
Build and maintain React front-end applications integrated with REST and GraphQL APIs.
Implement and consume Kafka event streams to enable reliable, asynchronous communication across services.
Contribute to API design, versioning, and documentation to ensure consistency across the ecosystem.
Participate in peer reviews, architecture discussions, and agile ceremonies.
Ensure high quality through unit, integration, and contract testing.
Partner with DevOps and QA to maintain CI/CD pipelines, monitoring, and telemetry for production systems.
Support incident resolution through effective root-cause analysis and continuous improvement.
Share knowledge, promote best practices, and help evolve WEX’s engineering standards.
Experience you'll bring
Expertise in C# .NET Core, RESTful API development, and service design.
Strong understanding of microservices, containerization (Docker, Kubernetes), and distributed systems design.
Solid understanding of SQL and NoSQL databases.
Experience with Git, CI/CD pipelines, and automated testing.
Strong problem-solving, debugging, and collaboration skills.
Effective written and spoken English communication.
Plus
Strong professional software engineering experience.
Experience with React and modern JavaScript/TypeScript frameworks.
Hands-on experience with Kafka or similar event streaming technologies.
Experience with Domain-Driven Design (DDD) and Event-Driven Architecture (EDA).
Familiarity with GraphQL federation (e.g., HotChocolate, Apollo Gateway).
Exposure to Azure or other cloud environments.
Knowledge of OpenTelemetry, Application Insights, or similar observability tools.
Previous experience in health, benefits, or financial services industries.
Demonstrated ability to influence technical direction and mentor other engineers.
Top Skills
What We Do
We simplify complex payment systems for fleets, corporate payments, and healthcare—unlocking insights, opportunities, and efficiencies to give you greater control of your business.
Powered by the belief that complex payment systems can be made simple, WEX (NYSE: WEX) is a leading financial technology service provider across a wide spectrum of sectors, including fleet, travel and healthcare. WEX operates in more than 10 countries and in more than 20 currencies through approximately 4,900 associates around the world. WEX fleet cards offer approximately 14 million vehicles exceptional payment security and control; our travel and corporate solutions business processes over $35 billion of purchase volume annually; and the WEX Health financial technology platform helps 343,000 employers and more than 28 million consumers better manage healthcare expenses.
