Software Development Engineer

You'll join a high-performing engineering team building our modern payments platform, currently powering corporate payments with plans to expand across all lines of business. You'll work on an event-driven, microservices architecture in Kubernetes, using Terraform, Kafka, and CI/CD to enable true continuous delivery. You'll embrace AI-assisted engineering to improve quality, speed, and your own developer experience.

As a senior engineer, you'll tackle complex technical problems, ship production code regularly, and raise the bar for engineering quality across the team. You'll mentor others, contribute to architectural decisions, and take ownership of features end-to-end. Your work directly impacts WEX's ability to process payments reliably and securely at scale.

This role is for engineers who want to do meaningful work on hard problems — not just ticket-takers who wait to be told what to build.

We're looking for someone who:

• Takes ownership of problems, not just tasks

• Writes clean, testable code and cares about doing things properly

• Can work across the stack when needed, but has depth in backend systems

• Communicates clearly and collaborates well with product and other engineers

• Wants to keep learning and isn't precious about their own code

• Design, build, and ship features end-to-end — from understanding requirements through to production deployment and monitoring

• Write production-quality C#/.NET code with appropriate test coverage

• Build and maintain services that process payments reliably at scale

• Contribute to architectural discussions and technical decision-making

• Use AI-assisted development tools effectively to accelerate your work

• Own the quality of what you ship — write tests, monitor production, fix issues

• Participate in code reviews that improve the codebase and help others grow

• Reduce tech debt and improve developer experience where you see opportunities

• Support operational excellence through observability, alerting, and incident response

• Mentor junior and mid-level engineers through pairing, code review, and knowledge sharing

• Work closely with Product to understand customer problems and shape solutions

• Communicate technical concepts clearly to both technical and non-technical audiences

• Continuously improve your craft and stay current with modern engineering practices

• You write clean, well-tested C#/.NET code — this is your primary language

• You've built and operated distributed systems or microservices in production

• You understand event-driven architectures and messaging patterns

• You've worked with CI/CD pipelines and understand modern DevOps practices

• You take ownership — you don't just write code and throw it over the wall

• 5+ years of software development experience

• Strong experience with .NET/C# in a production environment

• Experience with cloud-native development (Kubernetes, containerisation, infrastructure as code)

• Familiarity with event streaming, distributed systems, and data-intensive applications

• Experience with modern frontend technologies (Angular, TypeScript) is a plus

• Financial services or payments experience preferred but not required

You'll work with (and should have experience in most of):

• .NET/C# and TypeScript

• Angular

• AWS

• PostgreSQL

• Kubernetes, Terraform, Terragrunt, containerisation

• Event streaming with Kafka

• CI/CD pipelines and infrastructure as code

• AI-assisted developer tools

...and more. We're not short on interesting tech to work with.

• Work on systems that process real payments at scale — your code matters

• A team that values quality, ownership, and continuous improvement

• Opportunity to work with modern tech and shape how we build

• Autonomy to solve problems your way, with support when you need it

• An inclusive environment where your ideas are heard