Staff Software Engineer

WEX, Inc.; Portland (ME); Remote; USD 141,000 - 173,000; Full time

Job summary

WEX, Inc. is seeking a remote Staff Software Engineer (full-time) to lead backend-centric architecture for the Beyond Fuel and Expense Management initiative within WEX Mobility Engineering.

This role blends hands-on coding with technical leadership and collaboration with Product, Security, and engineering teams across the United States and India. You will shape the product from design through production launch, building web, mobile, and partner integrations, ensuring secure, scalable, and

Qualifications

• Bachelor's degree in Computer Science, Software Engineering, or a related field.
• 8–10 years of professional software engineering experience.
• Experience taking a new product from concept to production and evolving it as adoption grows.
• Strong proficiency in Java and Spring Boot, or comparable backend technologies.
• Design REST APIs, distributed systems, and relational data models.

Responsibilities

• Lead the technical 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 implementation plans.
• Establish patterns for payment workflows, expense capture, approvals, spend controls, reporting, and reconciliation.
• Write production code, review contributions, and resolve complex issues across the stack.

Skills

Java & Spring

REST APIs

Cloud AWS

CI/CD pipelines

Mentoring engineers

AI coding assistants

Code reviews

Education

Bachelor's degree in CS

Master's degree in CS

Tools

GitHub Copilot

Cursor

Claude

Job description

This is a remote position; however, the candidate must reside within 30 miles of one of the following locations: Boston, MA; San Francisco Bay Area, CA; Dallas, TX; Salt Lake City, UT; Seattle, WA; and Portland, ME

About the Team/Role

Are you excited about building solutions that expand fleet payments beyond fuel and simplify expense management? We are seeking a Full-stack Staff Software Engineer with deep expertise in backend development to provide technical leadership for the WEX Beyond Fuel and Expense Management initiative within WEX Mobility Engineering.

This is a brand-new initiative, offering the opportunity to shape the architecture, establish engineering practices, and build the product from initial design through production launch. You will work across web & mobile applications, backend services, APIs, and partner integrations to deliver secure, reliable, and scalable payment and expense management experiences.

This is an individual contributor role with technical leadership responsibilities and no direct people management. You will remain hands‑on while guiding technical decisions, mentoring engineers, and collaborating with Product, Design, Security, and engineering teams across the United States and India.

How you'll make an impact:

• Lead 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.
• Guide engineers through design reviews, code reviews, technical mentoring, and collaborative problem‑solving.
• 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.

Experience you'll bring

• Bachelor's degree in Computer Science, Software Engineering, or a related field.
• 8-10 years of professional software engineering experience.
• Experience taking a new product from concept to production and evolving it as adoption grows.
• Strong proficiency in Java and Spring Boot, or comparable backend technologies.
• Strong understanding of object‑oriented design, data structures, algorithms, and software design principles.
• 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.
• Ability to influence technical direction across teams without formal management authority.
• 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.

Preferred Qualifications

• Master's degree in Computer Science or Software Engineering.
• 10+ years of software engineering experience.
• Experience with API Gateways, service mesh technologies, and cloud networking concepts.
• Familiarity with OpenTelemetry, Grafana, Prometheus, or similar observability platforms.
• Exposure to web and mobile application development

The base pay range represents the anticipated low and high end of the pay range for this position. Actual pay rates will vary and will be based on various factors, such as your qualifications, skills, competencies, and proficiency for the role. Base pay is one component of WEX's total compensation package. Most sales positions are eligible for commission under the terms of an applicable plan. Non‑sales roles are typically eligible for a quarterly or annual bonus based on their role and applicable plan. WEX's comprehensive and market competitive benefits are designed to support your personal and professional well‑being. Benefits include health, dental and vision insurances, retirement savings plan, paid time off, health savings account, flexible spending accounts, life insurance, disability insurance, tuition reimbursement, and more. For more information, check out the "About Us" section.Pay Range: $140,600.00 - $173,100.00