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Skillset: Mainframes – Cobol, DB2, JCL, VSAM, CICS
Core Mainframe Fundamentals
MUST HAVE:
JCL: job setup, PROC/INCLUDE, condition codes, overrides, restart/rerun, dataset management.
COBOL: file/DB I/O, modularization, error handling, copybook usage, working storage vs linkage, performance considerations.
DB2: SQL (joins, correlated subqueries), embedded SQL in COBOL, bind/plan/package basics, commits/rollbacks, performance (indexes, access paths).
CICS (where applicable): pseudo‑conversational design, COMMAREA/Channels & Containers, MAP/MAPSET, task initiation/termination, error handling.
Mainframe Job Description
Key Responsibilities
1. Application Development & Maintenance Design, develop, and enhance mainframe applications using COBOL, JCL, DB2, CICS, VSAM, and other IBM mainframe tools.
Maintain and optimize existing code to improve performance, reliability, and scalability.
Conduct root-cause analysis and resolve production issues within SLAs.
2. Systems Analysis & Design
Analyze business requirements and translate them into technical specifications.
Participate in architecture and design discussions for new modules and system enhancements.
Work with cross-functional teams to ensure seamless integration of mainframe components.
3. Testing & Quality Assurance
Develop and execute unit, integration, and regression test cases.
Support QA teams in test planning and defect resolution.
Ensure compliance with coding standards, documentation, and audit requirements.
4. Production Support
Provide L2/L3 support for critical mainframe applications.
Monitor batch jobs and troubleshoot job failures and data issues.
Participate in on-call rotation for production support (if required).
5. Collaboration & Documentation
Work closely with business analysts, testers, and project managers to deliver high‑quality solutions.
Prepare and maintain technical documentation, including design specs, data flow diagrams, and operational procedures.
Participate in peer reviews to ensure code quality and knowledge sharing.
Technical Skills
Strong experience with:
COBOL (COBOL/370, COBOL II)
JCL (Job Control Language)
DB2 / SQL
CICS / IMS
VSAM
Batch and online processing
Hands-on experience with:
FileAid, Expeditor, Abend-AID, Changeman/Endevor, REXX scripts (optional) Familiarity with mainframe modernization tools or cloud migration (nice-to-have).
