Staff Software Engineer / Architect

Position Title: Staff Software Engineer / Architect – Java Modernization (AWS / Kubernetes) Location: St. Louis, MO

JD

We are looking for a staff‐level software engineer / architect to lead the modernization of a largescale, mission‐critical Java platform. This role is hands‐on and focused on rewriting and re‐architecting existing systems using modern Java, Spring Boot, and cloud‐native patterns on AWS.

What You'll Do

• Modernize a legacy Java platform to Java 21 and Spring Boot

• Re‐architect monolithic components into well‐structured, cloud‐native services

• Design and build services for AWS EKS and/or OpenShift

• Define execution models, service boundaries, and deployment patterns

• Drive architectural decisions around performance, scalability, and reliability

• Work closely with platform, DevOps, and cloud infrastructure teams

• Mentor senior engineers and set engineering standards

• Own solutions end‐to‐end — from design through production

What We're Looking For

• Staff‐level experience building and modernizing large Java systems

• Strong hands‐on experience with Java (17+ preferred, 21 ideal) and Spring Boot

• Deep understanding of distributed systems and system design

• Practical experience deploying applications on AWS, preferably EKS

• Solid Kubernetes knowledge (EKS and/or OpenShift)

• Experience containerizing applications and running them on a scale

• Strong grasp of performance tuning, JVM behavior, and low‐latency systems

• Ability to operate as both architect and hands‐on engineer

• Nice to Have

• Experience migrating from monoliths to cloud‐native architectures

• Exposure to eventing, messaging, or streaming systems (Kafka, MQ, etc.)

• Familiarity with CI/CD pipelines and infrastructure‐as‐code

• Background in financial services, payments, or high‐throughput systems

• Why This Role

• Opportunity to shape the future architecture of a critical platform

• Work on complex, high‐scale systems where design decisions matter

• High ownership, real technical impact, and long‐term relevance