Lead Java Developer, Mainframe Modernization

We are looking for a Lead Java Developer to drive an AWS ProServe mainframe modernization effort converting COBOL/JCL logic into Java microservices on AWS. You will use agentic AI to speed up spec, code, and IaC generation while validating functional equivalence and refining service designs.

Responsibilities

• Convert decomposed COBOL and JCL business logic into cloud-native Java microservices using Spring Boot and modern architectural patterns
• Use agentic AI tools to produce microservice specifications, modernized application code, and Infrastructure as Code from reverse-engineered mainframe components
• Verify AI-generated outputs for functional equivalence to original mainframe logic, then find and close transformation gaps
• Review and adjust mappings from mainframe constructs to target Java microservice implementations to preserve business logic
• Partner with architects to improve microservice designs, tune service boundaries, and implement appropriate API contracts
• Document transformation choices, architectural patterns, and integration specifications to enable knowledge transfer and ongoing maintenance

Requirements

• Proven record of 5+ years of Java development with advanced Spring Boot expertise
• Strong command of microservice architecture style and related design practices
• Hands-on proficiency with AWS Mainframe Modernization services and application modernization approaches
• Solid reading comprehension of COBOL, JCL, and VSAM file structures
• Working knowledge of CICS transaction processing on IBM Mainframe
• English proficiency at B2+ (Upper-Intermediate) level

Nice to have

• Familiarity with cloud-native development patterns
• Knowledge of AWS Transform
• Experience with Kiro and AI-assisted development tools

Benefits

• International projects with top brands
• Work with global teams of highly skilled, diverse peers
• Healthcare benefits
• Employee financial programs
• Paid time off and sick leave
• Upskilling, reskilling and certification courses
• Unlimited access to the LinkedIn Learning library and 22,000+ courses
• Global career opportunities
• Volunteer and community involvement opportunities
• EPAM Employee Groups
• Award-winning culture recognized by Glassdoor, Newsweek and LinkedIn