Full-Stack Engineer II - Payments & Expense Platform(Remote)

WEX; Maine; Remote; USD 96,000 - 116,000; Full time

Benefits offered by this job

Health insurance

Dental insurance

Vision insurance

Retirement plan

Paid time off

Health savings account

Flexible spending accounts

Life insurance

Disability insurance

Tuition reimbursement

Job summary

WEX is seeking a Full-stack Software Engineer II to help build the Beyond Fuel and Expense Management platform within Mobility Engineering. This remote role requires residing within 30 miles of Boston, MA; SF Bay Area; Dallas; Salt Lake City; Seattle; or Portland, ME.

You will design and implement backend services in Java/Spring Boot, collaborate across teams, and contribute to secure, scalable solutions with CI/CD and AWS, while embracing AI-assisted development tooling.

Qualifications

• Bachelor's degree in Computer Science, Software Engineering, or a related field.
• 4–6 years of professional software engineering experience.
• Proficiency in Java and Spring Boot or comparable backend technologies.
• Strong understanding of OO design, data structures, and 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 production services with monitoring, tracing, and incident troubleshooting.
• Strong communication skills for cross-functional collaboration.
• Hands-on experience using AI coding assistants and development tools.

Responsibilities

• Contribute to the design, development, and implementation of features for 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 and milestones.
• Design reusable APIs to support web, mobile, and partner experiences.
• Implement features for payment workflows, expense capture, approvals, and reporting.
• Evaluate options, balancing performance, security, reliability, and cost.
• Write production code, review contributions, and resolve complex issues.
• Participate in design and code reviews to uphold quality standards.
• Build observability with logs, tracing, metrics, dashboards, and alerts.
• Adopt AI tools for development, testing, and documentation.

Skills

Java

Spring Boot

REST APIs

AWS

CI/CD

Security

Testing

Distributed systems

AI coding assistants

Education

Bachelor's degree in Computer Science or related field

Tools

GitHub Copilot

Cursor

Claude

Job description

WEX is seeking a Full-stack Software Engineer II to help build the Beyond Fuel and Expense Management platform within Mobility Engineering. This remote role requires residing within 30 miles of Boston, MA; SF Bay Area; Dallas; Salt Lake City; Seattle; or Portland, ME.

You will design and implement backend services in Java/Spring Boot, collaborate across teams, and contribute to secure, scalable solutions with CI/CD and AWS, while embracing AI-assisted development tooling.