Description: * Solid experience (8+ years recommended) in Mainframe development. * In-depth expertise in COBOL, CICS, DB2, and JCL. * Consistent experience in banking systems, preferably involving guarantees, collateral, credit, or loans. * Strong end-to-end process analysis capability and understanding of integrations in complex environments. * Experience supporting critical systems and high-availability environments. * Proven track record in resolving complex incidents and implementing structural improvements. Work model: Hybrid — 3 days per week at Av. Paulista, SP. A Senior Mainframe Developer is required to work on highly critical solutions within the banking environment, with a focus on guarantee systems and credit infrastructure. This position demands strong analytical ability, technical autonomy, and strategic involvement across the full development and support lifecycle. * Lead analysis, development, and maintenance of Mainframe applications using COBOL, CICS, and DB2. * Serve as a technical reference in guarantee systems, guiding teams and proposing architectural improvements. * Conduct complex investigations, perform root cause analysis, and define structural and definitive solutions. * Plan and execute high-impact enhancements, ensuring performance, resilience, and compliance with financial sector regulatory standards. * Collaborate with business, risk, credit, and operations areas to translate functional requirements into robust solutions. * Assess impacts, guide testing processes (integrated, regression, acceptance), and ensure technical governance. * Produce advanced-level documentation (technical, functional, architectural) and support knowledge sharing within the team. 2512220202491080284