Mainframe Modernization Engineer involved in modernizing COBOL-based systems into Java applications. Collaborating with engineering teams to ensure accuracy and performance during transformation.
Responsibilities
Analyze and interpret legacy COBOL batch programs running on IBM mainframes, including programs utilizing JCL, DB2, and VSAM.
Understand and document functional logic, control flow, and data transformations to support modernization efforts.
Review and validate automatically generated functional documentation for accuracy, completeness, and alignment with actual program behavior.
Design and execute test cases to validate business logic and ensure output consistency between legacy and modernized systems.
Compare Java program outputs against original COBOL program results to identify discrepancies.
Collaborate with modernization and Java development teams to resolve mismatches and refine generated code.
Participate in transformation quality assurance activities and contribute to continuous improvement of the modernization platform.
Requirements
5–8 years of hands-on experience working with COBOL on IBM mainframe environments.
Strong experience with JCL, DB2, and VSAM.
Hands-on experience supporting and analyzing mainframe batch jobs.
Proven ability to analyze complex COBOL logic and map it to equivalent behavior in modern applications.
Solid understanding of testing methodologies, validation techniques, and defect analysis.
Strong analytical skills and attention to detail when reconciling outputs across systems.
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