Remote Senior Full-Stack Engineer – Payments & Expense Mgmt

WEX, Inc.; Dallas (TX); Remote; USD 122,000 - 146,000; Full time

Benefits offered by this job

Health, dental and vision insurance

Retirement savings plan

Paid time off

Health savings account

Flexible spending accounts

Life insurance

Disability insurance

Tuition reimbursement

Job summary

WEX, Inc. is seeking a Full‑stack Senior Software Engineer to contribute to the Beyond Fuel and Expense Management initiative within WEX Mobility Engineering.

This brand‑new role spans web & mobile apps, backend services, APIs, and partner integrations to deliver secure, scalable payment and expense experiences. You will work across US and India, driving architecture, engineering practices, and production launch from design through deployment.

Qualifications

• Bachelor's degree in Computer Science, Software Engineering, or related field.
• 6–8 years of professional software engineering experience.
• Proficiency in Java and Spring Boot; strong OO design, data structures, algorithms.
• 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 and tracing.
• Strong communication skills to collaborate across teams.
• Mentoring engineers and improving engineering practices.
• Hands‑on experience using AI coding assistants (Copilot, Cursor, Claude) to accelerate development.

Responsibilities

• Contribute to architecture, design, and implementation of the Beyond Fuel and Expense Management platform.
• Build full‑stack capabilities spanning UI, backend services, data models, and integrations.
• Translate product requirements into technical designs, milestones, and plans.
• Design reusable APIs and patterns for web, mobile, and partner experiences.
• Establish patterns for payment workflows, expense capture, approvals, spend controls, and reconciliation.
• Evaluate options and communicate tradeoffs on performance, security, reliability, and cost.
• Write production code, review contributions, and resolve complex issues across stack.
• Participate in design and code reviews to maintain quality.
• Establish standards for automated testing, observability, and secure development.
• Build production readiness with logs, tracing, metrics, dashboards, and alerts.
• Collaborate with leadership to manage dependencies and risks.

Skills

Java

Spring Boot

Object‑oriented design

REST APIs

Distributed systems

AWS

CI/CD pipelines

Security

Testing

AI coding

Communication

Mentoring

AI coding tools

Education

Bachelor's degree in CS/SE

Master's degree (preferred)

Tools

GitHub Copilot

Cursor

Claude

AWS

OpenTelemetry

Grafana

Prometheus

Job description

WEX, Inc. is seeking a Full‑stack Senior Software Engineer to contribute to the Beyond Fuel and Expense Management initiative within WEX Mobility Engineering.

This brand‑new role spans web & mobile apps, backend services, APIs, and partner integrations to deliver secure, scalable payment and expense experiences. You will work across US and India, driving architecture, engineering practices, and production launch from design through deployment.