[Hiring] Staff Engineer @WEXWEXUS

Role Description

As a Staff Software Engineer, you will be the primary architect and execution lead for leading the platform changes for the Digital Credit Application. We are pivoting from a legacy monolith to a high-performance, pluggable API ecosystem. Your mission is to:

• Decouple core adjudication logic.
• Enable rapid A/B testing of the customer journey.
• Lay the technical foundation for future AI-driven chat and automated decisioning experiences.

This is a high-impact role designed for a true "builder" who thrives on the duality of supporting a live production environment while aggressively migrating mission-critical services to a modern, microservices-based backbone. You will encounter varied customer scenarios where your out-of-the-box approach is a better fit than standard industry practices. We expect you to make a true difference for the customer, leveraging technology and AI to best serve and solve for good.

Qualifications

• 10+ Years of Engineering Excellence.
• Proven track record in backend architecture, specifically within Fintech, Lending, or Credit systems.
• Expert-level proficiency in Java 17/21, Spring Boot 3.x, and Spring Cloud.
• Experience extracting tightly coupled business logic from legacy backends into external, scalable cloud microservices (AWS).
• Experience building or implementing rules engines (e.g., Drools, Camunda, or custom JSON-logic) for automated decisioning.
• Deep experience with Kafka or RabbitMQ for maintaining asynchronous data consistency during migration phases.
• Strict adherence to API contracts (OpenAPI/Swagger) to ensure seamless collaboration with frontend teams.
• Hands-on experience using AI coding assistants (Cursor, Copilot, etc.) to optimize workflows, refactor legacy code, and accelerate delivery.
• Strong analytical skills and a proven capability in resolving complex, cross-functional problems.
• Excellent written and verbal communication skills; ability to present complex technical concepts clearly to stakeholders.
• Bachelor’s degree in Computer Science or a related technical field.

Requirements

• Lead the decoupling of core credit application logic out of the legacy monolith and into a scalable, cloud-native Java/Spring Boot microservices environment.
• Design and execute high-volume traffic migration strategies from legacy systems to new stacks seamlessly without disrupting live customers.
• Proficiency in Salesforce is a strong advantage for supporting bidirectional data and state synchronization within the Salesforce ecosystem.
• Design and implement a modular adjudication layer allowing the business to swap or update credit rules and third-party data providers without impacting core application flows.
• Build and maintain robust, versioned REST/gRPC APIs that support a multi-channel experience (Mobile, Web, and future AI Chat interfaces).
• Engineer backend infrastructure for dynamic routing and experimentation, allowing real-time testing of various application flows.
• Champion the use of AI tools across the development lifecycle to write code faster, refactor legacy code into modern Java, and generate robust test suites.
• Partner with Data Science teams to ensure data pipelines and backend schemas are optimized for LLM integration and real-time credit decisioning models.
• Establish rigorous standards for CI/CD, observability (OpenTelemetry), and automated contract testing.
• Provide guidance to mid-level and senior engineers, fostering a culture of high engineering standards, clean code, and AI-assisted productivity.

Benefits

• Health, dental, and vision insurances.
• Retirement savings plan.
• Paid time off.
• Health savings account.
• Flexible spending accounts.
• Life insurance.
• Disability insurance.
• Tuition reimbursement.
• Quarterly or annual bonus based on role and applicable plan.

Company Description

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.

WEX's comprehensive and market competitive benefits are designed to support your personal and professional well-being.

Pay Range: $140,600.00 - $173,100.00