Doran Jones Inc.

Mainframe Modernization Engineer

Doran Jones Inc.

full-time

Posted on:

Location Type: Hybrid

Location: Dallas • Texas • 🇺🇸 United States

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Job Level

Mid-LevelSenior

Tech Stack

Java

About the role

  • 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.

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
COBOLJCLDB2VSAMJavatesting methodologiesvalidation techniquesdefect analysisdata transformationsfunctional logic
Soft skills
analytical skillsattention to detailcollaborationcontinuous improvement