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.