Staff Software Engineer

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

About the Team/Role

As a Staff Software Engineer on the DCA team, you will be a key technical leader responsible for the stability, performance, and future architecture of our mission-critical Digital Credit Application (DCA) platform.
This role requires deep technical ownership, focusing on the backend services and complex transaction flows required before a credit decision (adjudication). You will be a vital link between Product and Engineering, actively managing stakeholder relationships by translating intricate business requirements into scalable, secure, and robust system designs.
Your mission is to guide the team toward a more flexible microservice architecture to address current platform limitations. You will drive solutions to persistent problems like data transaction conflicts, integration complexities with external fraud APIs (Plaid, LexisNexis), and operational challenges stemming from the current technology stack.
This is a hands-on position where you will set technical standards, provide critical mentorship to junior engineers, and solve complex, large-scale problems that directly impact our core business success across North America Mobility (NAM), Over-the-Road (OTR), and Customer Payment Solutions (CPS).

How you’ll make an impact

• Lead the design, architecture, and implementation of highly available and resilient microservices using Java and the Spring ecosystem.

• Drive technical roadmaps, project plans, and architectural decisions, balancing rapid delivery with long-term platform stability.

• Be responsible for critical non-functional requirements, including system performance, observability, security, and scalability under high load.

• Define and advocate for engineering best practices, including code quality standards, comprehensive testing strategies, and efficient code review processes.

• Partner closely with product management and front-end teams to design clean, effective, and robust APIs (REST/gRPC).

• Advise senior leadership on complex technical trade-offs and lead technical initiatives across organizational boundaries, driving consensus and adoption.

• Provide technical mentorship and guidance to mid-level and senior engineers, fostering a culture of high engineering standards.

Experience you’ll bring

• A highly skilled, innovative, and experienced Software Engineer capable of acting and delivering to complex business needs.

• Have 10+ years of progressive software design and development experience at scale, with significant experience in a technical leadership or staff-level role.

• Deep expertise in Java and the Spring ecosystem (Spring Boot, Spring Data).

• Proven experience designing and operating distributed systems and microservices architectures in a cloud environment (AWS, Azure, or GCP).

• Mandatory experience with high-volume data modeling, transactional integrity, and database technologies (both relational like PostgreSQL and NoSQL like Cassandra/MongoDB).

• Strong practical experience with event-driven architectures and messaging systems (e.g., Kafka or RabbitMQ).

• Experience working with Service Mesh technologies like Istio for traffic management, security (mTLS), and resiliency patterns.

• Demonstrated commitment to engineering quality, including deep experience with Test-Driven Development (TDD) and designing robust regression testing strategies.

• Expert knowledge of CI/CD pipelines, deployment automation, and modern observability tools (e.g., Prometheus, Grafana, Jaeger).

• Excellent analytical skills and capability in identifying and resolving complex, cross-functional problems.

• Strong written and verbal communication skills, able to present complex technical concepts clearly.

• Bachelor's degree in Computer Science or a related field.

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: $135,000.00 - $180,000.00