COBOL/Java Developer – Senior
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Job Description
Developer specializing in COBOL and Java for legacy banking systems. Contributing to system modernization efforts integrating AI and cloud technologies.
Responsibilities:
- Perform analysis and gain a deep understanding of legacy COBOL applications, covering both batch and online environments;
- Execute reverse engineering of legacy systems to identify business rules, end-to-end functional flows, and dependencies between programs and systems, with support from Artificial Intelligence tools;
- Map and document COBOL programs, JCLs, copybooks, DB2 and VSAM data structures, as well as integrations based on files, services, and external systems;
- Identify subprograms, reusable components, obsolete, redundant or unused code, and key points of functional and financial risk;
- Navigate, analyze and work on complex batch processing routines, including processing workflows, execution chains and diagnosis of abends in production;
- Extract, structure and document business rules, including financial calculations, validations and credit policies;
- Participate in incremental modernization initiatives for critical systems, ensuring operational continuity, functional and accounting equivalence, and risk mitigation during transitions;
- Support legacy system modernization programs, contributing to the transformation of COBOL applications into modern architectures based on Java and AWS Cloud.
Requirements:
- Proven experience in mainframe environments;
- Strong proficiency in COBOL (batch and online);
- Experience with JCL;
- Knowledge of DB2;
- Experience with CICS;
- Experience working with VSAM files (KSDS, ESDS and RRDS);
- Consistent experience in batch processing, including execution, monitoring and troubleshooting;
- Experience with complex processing networks/flows using tools such as Control-M, CA-7 or similar;
- Ability to analyze and resolve abends and production failures;
- Experience diagnosing performance issues and processing inconsistencies;
- Familiarity with mainframe code versioning tools such as Changeman, Endevor or equivalents;
- Experience in large enterprise environments, especially within the banking sector;
- Knowledge of online applications, including CICS transactions, screen-based systems (green screen) and services;
- Experience with synchronous and asynchronous integrations;
- Strong ability to read and interpret complex legacy code;
- Experience identifying subprograms, copybooks and shared data structures;
- Experience analyzing end-to-end flows involving both batch and online processing;
- Experience in DB2 data modeling and analysis;
- Knowledge of file-based integrations;
- Proven ability to perform functional and technical reverse engineering;
- Knowledge of financial calculations, including interest, IOF (financial transaction tax), amortization and debt renegotiation.
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