Software Development Engineer 3

Introduction

WEX is a global leader in financial technology solutions headquartered in Portland, Maine, with over 7,000 employees across 40+ countries. We simplify complex payment ecosystems for industries including Fleet, Corporate Payments, and Benefits — delivering secure, innovative, and scalable solutions.

About the team / Role

We are seeking a high-impact Full Stack Software Engineer (SDE4) to serve as a technical pillar within the WEX Mobility Engineering team. In this role, you will not only design and build scalable APIs and data pipelines but also define the architectural patterns that power our global fleet and payments platforms.

How you'll make an impact

As a Level 3 Engineer, you will:

• Lead the design and development of full-stack solutions, with emphasis on event-driven microservices, APIs, and data platforms
• Drive iterative modernization by decomposing monoliths into shared, modular services
• Build reusable capabilities aligned with product-centric domain models
• Contribute to agentic architectures and intelligent automation that power seamless user experiences
• Collaborate with cross-functional teams to deliver measurable business outcomes, not just features
• Mentor junior developers and promote best engineering practices

Experience you will bring

• Design, develop, test, and maintain cloud-ready microservices and APIs
• Work with streaming data pipelines (Kafka, CDC) to enable real-time insights
• Apply platform-thinking approaches by building reusable and discoverable capabilities
• Ensure quality from the start through automated validation and CI/CD pipelines
• Deliver value iteratively, focusing on finishing and deploying features
• Partner with product and architecture teams to ensure systems are decoupled, scalable, and SaaS-mature
• Use monitoring and feedback loops to drive data-informed improvements
• Proactively tackle technical debt while balancing modernization and customer value delivery

Required Qualifications

• Bachelor’s or Master’s degree in Computer Science or Engineering
• 5+ years of experience in backend or microservices development (Java, Python, Go, etc.)
• Hands-on experience with Java and Java-based frameworks
• Expertise in object-oriented design and programming
• Strong problem-solving skills in the software engineering domain
• Experience working with modern backend microservices architectures
• 5+ years of experience building and consuming RESTful APIs
• Experience with message brokers and event-streaming platforms (Kafka)
• Strong knowledge of SQL, relational, and non-relational databases
• Comfort working with JSON, XML, YAML, and other interface file formats
• Experience with Unix/Linux environments, scripting, and CI/CD pipelines
• Demonstrated ability to decompose systems into modular, reusable services
• Excellent communication and collaboration skills across distributed teams

Nice to Have

• Experience with FinTech solutions or payments ecosystems
• Cloud experience (AWS preferred) and containerization (Docker, Kubernetes)
• Familiarity with modern UI frameworks (React, Angular, Vue.js)
• Experience with Change Data Capture (CDC) tools
• Understanding of AI/ML integration in platforms and workflows
• Experience with large-scale transactions and highly available systems