Staff Software Engineer / Architect

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