CI&T

Senior Developer, Mainframe/COBOL

CI&T

full-time

Posted on:

Location Type: Hybrid

Location: Campinas • 🇧🇷 Brazil

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Job Level

Senior

About the role

  • 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.
  • Nice to have:
  • Prior experience in legacy modernization/migration (refactoring, replatforming, rehosting, strangler pattern, dual-run, etc.).
  • 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;
  • Pregnancy and responsible parenthood course;
  • Partnerships with online course platforms;
  • Language learning platform;
  • And many more

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
COBOLCICSDB2JCLVSAMTSOlegacy modernizationdebuggingimpact analysisregression testing
Soft skills
investigative analysistroubleshootingcommunicationorganizationcollaborationautonomy