Staff Software Engineer: AI-Driven Microservices Architect

WEX Inc.; California; Hybrid; USD 141,000 - 173,000; Full time

Benefits offered by this job

Health, dental and vision insurance

Retirement savings plan

Paid time off

Health savings account

Flexible spending accounts

Life insurance

Disability insurance

Tuition reimbursement

Job summary

WEX Inc. is seeking a Staff Software Engineer to architect and lead platform changes for the Digital Credit Application, moving from a legacy monolith to a cloud-native microservices architecture.

You will decouple core adjudication logic, enable rapid A/B testing, and lay the foundation for AI-driven decisioning and chat interfaces. You will champion Strangler Fig migration, modular adjudication, and an API-first design while promoting observability, CI/CD, and strong technical mentorship

Qualifications

• 10+ years of backend architecture experience, Fintech/Lending context preferred.
• Proficient in Java 17/21, Spring Boot 3.x, and Spring Cloud.
• Experience migrating from legacy monoliths to distributed microservices (AWS).
• Strong experience with event-driven design using Kafka or RabbitMQ.
• Experience designing API contracts with OpenAPI/Swagger.
• Proficiency with AI-assisted development tools to accelerate delivery.
• Excellent communication and leadership across cross-functional teams.

Responsibilities

• Lead the architectural migration from a legacy monolith to a scalable microservices backbone.
• Design a pluggable adjudication layer and a versioned API ecosystem.
• Drive AI readiness and adoption across the delivery lifecycle.
• Provide technical mentorship to engineers and uphold high coding standards.

Skills

Backend architecture

Java 17/21

Spring Boot 3.x

Monolith to microservices

Kafka/RabbitMQ

API contracts (OpenAPI/Swagger)

AI tooling (Cursor/Copilot)

Leadership & mentorship

Education

Bachelor’s degree in Computer Science or related field

Tools

OpenTelemetry

GitHub Copilot

Cursor

Spring Cloud

Job description

WEX Inc. is seeking a Staff Software Engineer to architect and lead platform changes for the Digital Credit Application, moving from a legacy monolith to a cloud-native microservices architecture.

You will decouple core adjudication logic, enable rapid A/B testing, and lay the foundation for AI-driven decisioning and chat interfaces. You will champion Strangler Fig migration, modular adjudication, and an API-first design while promoting observability, CI/CD, and strong technical mentorship