Mainframe Developer specializing in COBOL for technology transformation initiatives. Involves modernization, migration, and decommissioning of legacy systems.
Responsibilities
Participate in legacy discovery: understand flows, map business rules and document components (programs, copybooks, JCLs, DB2 tables, VSAM files and CICS transactions).
Perform impact and dependency analysis to support the migration/modernization plan.
Implement adjustments in the legacy system for stabilization and decoupling, when necessary, enabling phased migration.
Execute and support regression testing, debugging and fixes (online and batch), ensuring stability during the transition.
Support transition strategies such as parallel runs (dual-run), result validation/reconciliation and cutover preparation.
Lead decommissioning activities: removal of jobs, routines, transactions, datasets and integrations, ensuring evidence, traceability and risk mitigation.
Produce and maintain relevant technical and functional documentation for audit, support and knowledge transfer.
Requirements
Proven experience with COBOL in a mainframe environment.
Strong knowledge of CICS, DB2, JCL, TSO and VSAM.
Experience with change management tools (e.g., Changeman) and debugging/analysis tools.
Ability to perform investigative analysis (troubleshooting), identify root cause and propose solutions with a systems perspective.
Good verbal and written communication for interacting with technical teams and stakeholders.
Ability to work autonomously, stay organized and collaborate within a team.
Experience mapping integrations (services, messaging, files/batches, data exchange routines).
Knowledge of quality and reliability practices (observability, metrics, incident management).
Use of supporting tools (including AI) to accelerate documentation, summarization of flows/code, test case generation and analysis support — with human technical validation.
Benefits
Health and dental insurance;
Meal and food allowance;
Childcare assistance;
Extended parental leave;
Partnerships with gyms and health/wellness professionals via Wellhub (Gympass) / TotalPass;
Profit-sharing (PLR);
Life insurance;
Continuous learning platform (CI&T University);
Discount club;
Free online platform dedicated to physical and mental health and well-being;
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