Developer Mainframe Interview Questions

437 developer mainframe interview questions shared by candidates

COBOL: Static vs. Dynamic Call, SEARCH vs. SEARCH ALL, COMP-3 usage, PERFORM types, debugging S0C7. JCL: JOBLIB vs. STEPLIB, GDG, COND vs. IF, restart steps. DB2: Deadlocks (-911), isolation levels, REORG vs. RUNSTATS, SQL performance tuning. IMS: GU vs. GN, PSB, Checkpoints.
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Mainframe Developer

Interviewed at Infosys

3.6
Feb 23, 2025

COBOL: Static vs. Dynamic Call, SEARCH vs. SEARCH ALL, COMP-3 usage, PERFORM types, debugging S0C7. JCL: JOBLIB vs. STEPLIB, GDG, COND vs. IF, restart steps. DB2: Deadlocks (-911), isolation levels, REORG vs. RUNSTATS, SQL performance tuning. IMS: GU vs. GN, PSB, Checkpoints.

The interview was average... 1. They asked about basics manual testing 2. kicks region .. 3. Any automation tools used to developed mainframe applications. 4. Credit card flow. 5. Software testing lifecycle.(STLC)
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Senior Mainframe Tester

Interviewed at TSYS|Total System Services

3.5
Aug 29, 2021

The interview was average... 1. They asked about basics manual testing 2. kicks region .. 3. Any automation tools used to developed mainframe applications. 4. Credit card flow. 5. Software testing lifecycle.(STLC)

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