WEX

Staff Engineer

WEX
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3 days ago
Remote, United StatesStaff+
H1B sponsor

Base Salary

$141k - $173k/yr

Responsibilities

  • Lead the decoupling of credit application and adjudication logic from a legacy monolith into scalable cloud-native services.
  • Design and implement modular adjudication layers, versioned REST/gRPC APIs, and dynamic routing for A/B testing.
  • Execute high-volume, zero-downtime migrations between legacy systems and modern services.
  • Build event-driven synchronization with legacy systems of record and support Salesforce data and state integrations.
  • Establish standards for CI/CD, OpenTelemetry observability, automated contract testing, and AI-assisted software development.
  • Partner with Data Science teams on backend schemas and data pipelines for LLM integration and real-time credit decisioning.
  • Mentor mid-level and senior engineers and provide technical leadership across teams.

Requirements

  • 10+ years of engineering experience, including backend architecture in fintech, lending, or credit systems.
  • Expertise with Java 17/21, Spring Boot 3.x, and Spring Cloud.
  • Significant experience migrating tightly coupled legacy backends to scalable AWS cloud services.
  • Experience with rules engines such as Drools, Camunda, or custom JSON-logic.
  • Deep experience with Kafka or RabbitMQ for asynchronous data consistency.
  • Experience with OpenAPI/Swagger and contract-first API development.
  • Hands-on experience using AI coding assistants such as Cursor or GitHub Copilot to refactor code, generate tests, and accelerate delivery.
  • Strong analytical, communication, presentation, and cross-functional problem-solving skills.
  • Bachelor’s degree in Computer Science or a related technical field.

Benefits

  • Benefits include health, dental, and vision insurance; retirement savings; paid time off; health savings and flexible spending accounts; life and disability insurance; tuition reimbursement; and potential role-based bonus eligibility.

Tech Stack

Apache KafkaAWSgRPCJavaRabbitMQSpring Boot

Categories

WEX

About WEX

5,001-10,000 employees

WEX is a public financial technology company that provides corporate payment solutions to fleets, healthcare/benefits administrators, and travel businesses. Its products include fuel and mobility cards, virtual card payments, and platforms for HSAs/FSAs/HRAs, with revenue from payment processing and software/service fees. Founded in 1983 and headquartered in Portland, Maine, WEX trades on the NYSE under WEX and was formerly known as Wright Express.

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