This is a remote position; however, the candidate must reside within 30 miles of one of the following locations: Boston, MA; San Francisco Bay Area, CA; Dallas, TX; Salt Lake City, UT; Seattle, WA; and Portland, ME.

About the Team/Role

WEX is a global leader in financial technology solutions, simplifying complex payment ecosystems across Fleet, Corporate Payments, and Benefits. We are driving a major transformation through Helix—a technology strategy to modernize our platforms, accelerate innovation, and deliver exceptional customer experiences.
 

We are seeking a Full Stack Software Engineer (Level 3) who can design and deliver scalable, secure, and modular systems that align with Helix’s pillars: workflow optimization, payments intelligence, and industry expertise. This role offers the opportunity to shape our next-generation platforms while modernizing legacy systems into API-first, composable, and data-driven architectures.

How You’ll Make an Impact

• Lead design and development of full-stack solutions, with emphasis on event-driven microservices, APIs, and data platforms.

• Drive iterative modernization, helping decompose 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 Helix-aligned engineering practices.

What You’ll Do

• Design, develop, test, and maintain cloud-ready services and APIs.

• Work with streaming data pipelines (Kafka, CDC, JSON) to enable real-time insights.

• Implement platform-thinking approaches—build reusable, discoverable capabilities.

• Ensure quality from the start through automated validation and CI/CD pipelines.

• Deliver value iteratively, focusing on finishing and deploying features, not just starting them.

• 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.

• Tackle technical debt proactively, balancing modernization with customer value delivery.
   

Experience You’ll Bring

• Bachelor’s degree in Computer Science, Engineering, or equivalent experience.

• 5+ years in backend/microservices development (Python, Java, Node.js, etc).

• 3+ years building RESTful APIs; experience with event streaming (Kafka).

• Strong knowledge of CDC, JSON/XML, relational/NoSQL, Postgres and other modern databases.

• Experience in 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 platforms or payments ecosystems.

• Exposure to Siebel CRM or other enterprise systems, particularly in integration.

• Cloud experience (AWS preferred), containerization (Docker, Kubernetes).

• Familiarity with modern UI frameworks (React, Angular, Vue.js).

• Understanding of AI/ML integration in platforms and workflows.

• Experience with large-scale transaction or high-availability systems.

What Makes You a Great Fit

• You embody Helix principles: API-first, modular, iterative, data-driven.