Senior Full Stack Software Engineer

** 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, , etc).
* ** 3+ years
** building RESTful APIs; experience with event streaming (Kafka).
* Strong knowledge of
** CDC, JSON/XML, relational/No

SQL, 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
** Fin Tech 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.
* You thrive in
** modernization work**, making legacy systems more agile.
* You value
** finishing and delivering
** over just starting.
* You see engineering as a way to
** unlock business outcomes**, not just write code.
* You champion
** quality, automation, and reusability
** in everything you build.

Pay Range: $ - $WEX is a global commerce platform that helps businesses solve for operational complexities like employee benefits, managing and mobilizing fleets, and streamlining payments.

With over 6,500 employees, we work with large and small companies in more than 200 countries and territories, and can tailor our services to meet the unique needs of…