Software Development Engineer 3

About the team / Role

WEX is a global leader in financial technology solutions, simplifying complex payment ecosystems across Fleet, Corporate Payments, and Health & Benefits. For further details, do visit www.wexinc.com . We are driving a major technology transformation to modernize our platforms, accelerate innovation, and deliver exceptional customer experiences.

We are seeking a Senior Software Engineer (SDE-3) to contribute to this transformation by designing and building reliable, scalable, and modern services. You’ll help evolve our legacy systems into API-first, modular, and event-driven architectures that enable faster delivery, smarter workflows, and the foundation for agentic, intelligent systems.

How you'll make an impact

As a Level 3 Engineer, you will

• Lead design and development of full-stack solutions, with emphasis on event-driven micro-services, 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 best engineering practices.

Experience you will bring

• Design, develop, test, and maintain cloud-ready micro-services and APIs.
• Work with streaming data pipelines (Kafka, CDC) 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.

Required Qualifications

• Bachelor’s/Master’s degree in Computer Science and Engineering.
• 5+ years in backend/micro-services development leveraging Java tech stack.
• Hands-on experience with Java and Java related frameworks.
• Expertise in object oriented design and programming.
• Strong problem solving skills in the software engineering domain.
• Experience in working on modern backend micro-services architecture.
• 5+ years in building Restful APIs, exposing and consuming; experience with message broker and event streaming (Kafka).
• Strong knowledge of SQL, relational and non relational databases.
• Comfortable working with JSON, XML, YML and other interfacing file types.
• 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 solutions or payments ecosystems.
• Cloud experience (AWS preferred), containerization (Docker, Kubernetes).
• Experience with large-scale transactions and highly available systems.
• Familiarity with modern UI frameworks (React, Angular, Vue.js).
• Familiarity with Change Data Capture (CDC) tools.
• Interest in AI and automation — especially in how intelligent agents can optimize workflows.

What Makes You a Great Fit

• You’re eager to learn from staff engineers and contribute to building the future architecture.
• You think about reusability, data flow, and automation when building solutions.
• You’re curious about agentic systems and how technology can enable intelligent automation.
• You take pride in writing quality code that moves systems closer to cloud-ready, modular design.
• You thrive in a collaborative, fast-paced environment where modernization is a shared mission.