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Senior Java Developer, Mainframe Modernization

Remote in Argentina, & 4 others
Java& 11 others
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We are seeking a Senior Java Developer to join an AWS ProServe mainframe modernization engagement. This initiative transforms legacy COBOL/JCL business logic into cloud-native Java microservices, leveraging agentic AI capabilities to accelerate code generation and ensure functional equivalence with source systems.

Responsibilities
  • Transform decomposed mainframe business logic from COBOL and JCL into cloud-native Java microservices using Spring Boot and modern architectural patterns
  • Leverage agentic AI tools to generate microservice specifications, modernized application code, and Infrastructure as Code from reverse-engineered mainframe components
  • Validate AI-generated output for functional equivalence against original mainframe logic, identify and resolve transformation gaps
  • Review and refine mappings between mainframe constructs and target Java microservice implementations to preserve business logic
  • Collaborate with architects to refine microservice designs, optimize service boundaries, and implement appropriate API contracts
  • Document transformation decisions, architectural patterns, and integration specifications to support knowledge transfer and maintenance
Requirements
  • 5+ years of experience in Java development with advanced expertise in Spring Boot
  • Advanced skills in microservice architecture style
  • Proficiency in AWS Mainframe Modernization services and application modernization
  • Reading comprehension of COBOL, JCL, and VSAM file structures
  • Familiarity with CICS transaction processing on IBM Mainframe
  • Proficiency in English at a B2+ level
Nice to have
  • Understanding of cloud-native development patterns
  • Knowledge of AWS Transform
  • Background in Kiro and AI-assisted development tools