Mainframe Developer

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): pseudoconversational 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 highquality 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).