Job Description
Introduction
WEX is a global leader in financial technology solutions, simplifying complex payment ecosystems across Fleet, Corporate Payments, and Health & Benefits. 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) who can design and deliver scalable, secure, and modular systems that align with our technology transformation strategies. This role offers an opportunity to work with a team who handles the financial processing for North America Fleet business in terms of billing to the customers and settling payments with the merchants.
As a part of this technology transformation we are aiming to modernize our legacy financial processing system (Billing and Settlement) in terms of building modular and scalable micro-services leveraging modern technologies across the entire architecture which are highly available, easy to maintain, resilient enough, developer friendly and optimize the performance of overall billing and settlement processes without depending on any legacy components.
Scope of Role
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.
What You’ll Do
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 (Java, Python, GoLang etc.)
Hands-on experience with Java and Java related frameworks.
Expertise in object oriented design and programming.
Strong problem solving skills in 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.
Exposure to Oracle EBS, PeopleSoft or other enterprise systems, particularly in financial processing module which handles accounts receivable, accounts payable and general ledger accounting entries.
Cloud experience (AWS preferred), containerization (Docker, Kubernetes).
Familiarity with modern UI frameworks (React, Angular, Vue.js).
Familiarity with Change Data Capture (CDC) tools.
Understanding of AI/ML integration in platforms and workflows.
Experience with large-scale transactions and highly available systems.
What Makes You a Great Fit
You embody our engineering 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.