Senior Java Software Engineer
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Hiring: Senior Software Engineer
Location: O'Fallon, Missouri (Hybrid – 3 days/week in office)
Duration: 12 months
About the Role:
We're looking for a Senior Software Engineer to help design and build a next-generation Decision Management Platform — a real-time system that scores and approves billions of payment transactions. This is a hands-on role where you'll write code, run prototypes, and use AI coding tools daily to ship faster and at higher quality, joining a high-growth team actively expanding to meet increasing scale and impact. Top 3 Required Skills1. Java Full Stack Engineering Java 8+, J2EE, Spring, Hibernate Angular/React front-end developmentREST/SOAP APIs and enterprise application development2. Cloud-Native Architecture & DevOpsCloud-Native / AWS or other cloud platformsCI/CD and tools like Jenkins, Maven, Gradle, Chef, and Sonar3. GenAI / AI-Enabled Engineering Leverage GenAI tools to boost developer productivityAI-assisted coding, testing, documentation, and troubleshooting Explore GenAI use cases for modernization, automation, and platform efficiency
Key Responsibilities:
- Develop enterprise applications using Java with Angular or React
- Participate in gathering and refining business requirements
- Ensure designs align with Enterprise Architecture standards
- Drive performance engineering and platform scalability/resilience
- Support compliance requirements (PCI, GLBA, Safe Harbor, etc.)Use AI tools like Claude Code, Copilot, or similar daily
What We're Looking For:
- Bachelor's degree in CS, IT, Engineering, or equivalent experience 10+ years of industry experience
- Strong hands-on experience with J2EE, Java 8+, JSP, Servlets, Spring 5, HibernateSQL/NoSQL experience (Oracle, SQL Server, MySQL, PostgreSQL, MongoDB)
- Experience with SOAP/RESTful web services, WebSphere/JBoss/Tomcat
- Familiarity with Maven, Gradle, Jenkins, Chef, Sonar; Agile/Waterfall
- Experience with LLM integration, prompt engineering, and agentic patterns