Senior Full-Stack Engineer - Payments Platform (Remote)

WEX; United States; Remote; USD 122,000 - 146,000; Full time

Job summary

WEX is seeking a Remote Senior Software Engineer to join the Beyond Fuel and Expense Management initiative within Mobility Engineering. You will shape architecture and deliver production-ready solutions across web, mobile, APIs and partner integrations.

This brand-new initiative offers ownership from design through production launch. You will work with Product, Design, Security and engineering teams across the United States and India, building secure, scalable experiences and establishing best

Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, or a related field.
• 6-8 years of professional software engineering experience.
• Strong proficiency in Java and Spring Boot, or comparable backend technologies.
• Experience designing REST APIs, distributed systems, relational data models, and event-driven integrations.
• Experience with cloud platforms, preferably AWS, and automated CI/CD pipelines.
• Knowledge of authentication, authorization, data protection, and secure API design.
• Experience with unit, integration, end-to-end, and performance testing.
• Experience building and operating production services with monitoring, distributed tracing, and incident troubleshooting.
• Strong communication skills to collaborate effectively across multidisciplinary teams.
• Ability to explain technical decisions clearly to engineering and business stakeholders.
• A track record of mentoring engineers and improving engineering practices through hands-on collaboration.
• Hands-on experience leveraging AI coding assistants and development tools (e.g., GitHub Copilot, Cursor, Claude) to accelerate software development, refactoring, and code generation.

Responsibilities

• Contribute to the technical architecture, design, and implementation of the Beyond Fuel and Expense Management platform.
• Build full-stack capabilities spanning user interfaces, backend services, data models, and external integrations.
• Translate product requirements into technical designs, delivery milestones, and implementation plans.
• Design reusable business capabilities and APIs that support web, mobile, and partner experiences.
• Establish patterns for payment workflows, expense capture, approvals, spend controls, transaction reporting, and reconciliation.
• Evaluate technical options and communicate tradeoffs involving performance, security, reliability, cost, and delivery timelines.
• Write production code, review contributions, and resolve complex issues across the application stack.
• Participate in design reviews, code reviews, and technical discussions to support engineering quality.
• Establish standards for automated testing, API contracts, observability, accessibility, and secure development.
• Build production readiness into the product through actionable logs, distributed tracing, metrics, dashboards, and alerts.
• Use approved AI tools throughout development, testing, and documentation, and review and validate all generated output.
• Partner with engineering leaders to identify dependencies, manage technical risks, and support delivery.
• Own technical outcomes from initial implementation through deployment, operation, and continuous improvement.

Skills

Java

Spring Boot

Object-oriented design

Communication

Mentoring engineers

AI tooling

Education

Bachelor's degree in Computer Science or related field

Tools

OpenTelemetry

Grafana

Prometheus

AWS

CI/CD pipelines

GitHub Copilot

Cursor

Claude

Job description

WEX is seeking a Remote Senior Software Engineer to join the Beyond Fuel and Expense Management initiative within Mobility Engineering. You will shape architecture and deliver production-ready solutions across web, mobile, APIs and partner integrations.

This brand-new initiative offers ownership from design through production launch. You will work with Product, Design, Security and engineering teams across the United States and India, building secure, scalable experiences and establishing best