Senior Software Engineer

WEX • Portland, ME

8d

About The Position

WEX is seeking a full-stack Senior Software Engineer with deep backend expertise for its Beyond Fuel and Expense Management initiative within WEX Mobility Engineering. This brand-new initiative offers the opportunity to shape the architecture, establish engineering practices, and build the product from initial design through production launch. The role works across web and mobile applications, backend services, APIs, and partner integrations to deliver secure, reliable, and scalable payment and expense-management experiences. It is an individual-contributor position involving collaboration with Product, Design, Security, and engineering teams across the United States and India.

Requirements

• 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.
• 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.
• Strong communication skills for collaboration across multidisciplinary teams.
• Ability to explain technical decisions clearly to engineering and business stakeholders.
• Track record of mentoring engineers and improving engineering practices through hands-on collaboration.
• Hands-on experience using AI coding assistants and development tools (e.g., GitHub Copilot, Cursor, Claude) to accelerate software development, refactoring, and code generation.

Nice To Haves

• Master's degree in Computer Science or Software Engineering.
• 8+ 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.

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 for 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 through actionable logs, distributed tracing, metrics, dashboards, and alerts.
• Use approved AI tools throughout development, testing, and documentation, and review and validate 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.

Benefits

• Health insurance
• Dental insurance
• Vision insurance
• Retirement savings plan
• Paid time off
• Health savings account
• Flexible spending accounts
• Life insurance
• Disability insurance
• Tuition reimbursement
• Quarterly or annual bonus eligibility for non-sales roles, based on role and applicable plan

What This Job Offers

• Job Type: Full-time
• Career Level: Senior