Staff Engineer

wexinc; United States; Remote; USD 141,000 - 173,000; Full time

Benefits offered by this job

Health insurance

Dental insurance

Vision insurance

Retirement savings

Paid time off

Health savings account

Flexible spending accounts

Life insurance

Disability insurance

Tuition reimbursement

Job summary

WEX Inc. in the United States is seeking an experienced software architect to lead the modernization of a digital credit application platform.

The role blends architecture and hands-on delivery, maintaining a live production system while moving high-volume customer journeys toward modular APIs that support experimentation and future AI-enabled experiences. You will migrate legacy logic into Java microservices, design modular decisioning components, build versioned APIs for web and mobile, and

Qualifications

• 10+ years of software engineering experience, backend architecture in fintech or credit systems.
• Expert-level Java 17/21, Spring Boot 3, and Spring Cloud.
• Experience breaking legacy backends into scalable cloud microservices, preferably on AWS.
• Strong API contracts with OpenAPI/Swagger and clear communication.

Responsibilities

• Migrate legacy logic to Java microservices with minimal customer disruption.
• Design modular decisioning components for adaptable credit rules.
• Build versioned REST or gRPC APIs for multiple channels.
• Create infrastructure for dynamic routing and experiments.
• Use event-driven patterns to sync new services with legacy systems.
• Set CI/CD, observability, and contract testing standards; mentor engineers.

Skills

Backend architecture

Mentoring engineers

Cross-functional collaboration

Problem solving

Education

Bachelor's degree in computer science or related field

Tools

Java 17/21

Spring Boot 3

Spring Cloud

OpenAPI/Swagger

AWS

Kafka

RabbitMQ

Job description

Role overview

Lead the modernization of a digital credit application platform, extracting core decision logic from a legacy monolith into cloud-based services. The role combines architecture and hands‑on delivery: maintaining a live production system while moving high-volume customer journeys toward modular APIs that support experimentation and future AI‑enabled experiences.

Responsibilities

• Guide migration of tightly coupled application logic into Java and Spring Boot microservices, planning transitions that avoid customer disruption.
• Design modular decisioning components so credit rules and external data providers can change without rewriting core application flows.
• Build versioned REST or gRPC APIs for web, mobile, and other customer channels.
• Create infrastructure for dynamic routing and experiments that test different application journeys.
• Use event‑driven patterns to maintain consistency between new services and legacy systems during migration.
• Set delivery and operations standards for CI/CD, observability, contract testing, and AI‑assisted development; mentor engineers across the team.

Requirements

• 10+ years of software engineering experience, including backend architecture in fintech, lending, or credit systems.
• Expert‑level Java 17/21, Spring Boot 3, and Spring Cloud skills.
• Significant experience breaking legacy backends into scalable cloud microservices, preferably on AWS.
• Experience with decision rules engines and event‑driven messaging such as Kafka or RabbitMQ.
• Strong API contract practices, including OpenAPI or Swagger, and skill in solving complex cross‑functional problems.
• Bachelor’s degree in computer science or a related technical field, plus clear written and verbal communication.

Nice to have

• Salesforce experience, including integrations that synchronize data and state across systems.
• Hands‑on use of AI coding assistants to refactor legacy code, generate tests, or improve documentation.
• Experience with OpenTelemetry and automated contract testing.

Benefits and work setup

The listed base pay range is $140,600–$173,100. Benefits include health, dental and vision insurance, retirement savings, paid time off, health savings and flexible spending accounts, life and disability insurance, and tuition reimbursement.