Mainframe Developer

Core Responsibilities

• Design, write, test, and implement complex, highly secure batch and online programs utilizing enterprise COBOL within IBM zOS environments.
• Architect and optimize online CICS applications to ensure ultra-low latency, optimal screen data layouts, high-volume throughput, and robust error-handling protocols.
• Design efficient relational tables, write high-performance embedded SQL statements, and optimize DB2 stored procedures, indexes, and queries to eliminate processing bottlenecks.
• Manage, write, and optimize complex JCL (Job Control Language) streams, utilities (IEBGENER, IDCAMS, SORT), and automated batch scheduling systems.
• Perform advanced root-cause analysis, system tracing, and performance tuning using tools like Dump Analysis, Xpeditor, InterTest, or File-AID to maintain high availability.
• Partner with Cloud and Integration Architects to expose core mainframe data and transactional logic to modern RESTful APIs via zOS Connect or MQ Series.
• Define and enforce coding standards, lead rigorous code reviews, and maintain comprehensive documentation for legacy architectures.

Required Technical Stack And Experience

• Experience: 8 plus years of professional experience in IBM Mainframe software engineering.
• Proven track record in high-volume, transactional environments e.g., Financial Services, Healthcare, Logistics, or Insurance.
• Technical Stewardship: Define and enforce coding standards, lead rigorous code reviews, and maintain comprehensive documentation for legacy architectures.

Required Tooling And Concepts

• Languages: Enterprise COBOL, JCL, Embedded SQL, Assembler/EZTrieve is a plus
• Online Processing: CICS, BMS Maps, TS/TD Queues, Program Control, Intercommunication
• Data Management: DB2 Relational design