Staff Software Engineer - Fintech Platform Migration

WEX; Maine; On-site; USD 141,000 - 173,000; Full time

Benefits offered by this job

Health insurance

Dental & Vision

Retirement plan

Paid time off

Life insurance

Job summary

WEX in Maine is seeking a Staff Software Engineer to architect and execute platform changes for the Digital Credit Application. You will drive a migration from a legacy monolith to a microservices-based, cloud-native Java/Spring Boot stack while enabling AI-assisted development and testing.

You will champion API-first design, real-time experimentation, and scalable adjudication rules with strong leadership across teams and production operations.

Qualifications

• 10+ years in backend architecture in Fintech, Lending, or Credit domains.
• Expert Java 17/21, Spring Boot 3.x, and Spring Cloud experience.
• Strong experience in migrating monoliths to microservices (AWS).

Responsibilities

• Decouple core credit logic from legacy monolith into scalable microservices.
• Design API-first REST/gRPC services for multi-channel access and AI chat.
• Lead high-volume, zero-downtime migrations with production readiness.
• Mentor engineers and uphold observability and CI/CD standards.

Skills

Java backend

Spring Boot

AWS

Microservices

Kafka

OpenAPI

Education

Bachelor's degree in CS

Tools

Drools

Camunda

JSON-Logic

OpenTelemetry

Job description

WEX in Maine is seeking a Staff Software Engineer to architect and execute platform changes for the Digital Credit Application. You will drive a migration from a legacy monolith to a microservices-based, cloud-native Java/Spring Boot stack while enabling AI-assisted development and testing.

You will champion API-first design, real-time experimentation, and scalable adjudication rules with strong leadership across teams and production operations.