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