MAINFRAME ASSEMBLER DEVELOPER

Locations: Hyderabad | Bangalore | Chennai | Pune
Experience: 6–10+ Years overall | 5+ Years relevant Mainframe Assembler experience mandatory
Work Mode: Hybrid – 2–3 Days WFO
Work Timings: 11:00 AM–8:00 PM / 12:00 PM–9:00 PM
Interview Rounds: 2 Client Internal Rounds
Interview Mode: Virtual

Key Skills:

IBM z/OS Assembler (HLASM) – 5+ Years mandatory
Strong Enterprise COBOL experience on z/OS
Assembler → COBOL rewrite / modernization experience
Strong JCL knowledge
Batch & CICS environments
VSAM / IAM / DB2 / Datacom
Mainframe debugging tools – IPCS, Abend-AID
Assembler macros, copybooks, registers & storage management
Functional equivalence testing & defect fixing
Performance analysis and optimization

What You’ll Do:

Analyze complex HLASM programs, macros, control blocks and call chains
Understand and document business logic embedded in legacy assembler code




Rewrite assembler programs into maintainable, functionally equivalent COBOL
Translate low-level assembler constructs, register operations and data handling into COBOL
Design and execute unit/integration testing for modernization programs
Debug functional mismatches and resolve defects
Optimize CPU, I/O, storage and performance-critical code paths
Create transparent technical and functional documentation
Collaborate with architects, testers, modernization and QA teams

Ideal Candidate:

We’re looking for someone who can go beyond syntactic code conversion and truly understand assembler behavior, business rules and functional equivalence.

Experience in Mainframe modernization / migration programs and automated rewrite or code-mining tools will be an added advantage.

📌 MAINFRAME ASSEMBLER DEVELOPER (Hyderabad)
🏢 Zanusys
📍 Hyderabad