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Guilherme Duart

@guilhermeduart

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Mainframe Analyst at GFT Technologies who contributed to Bradesco's alphanumeric CNPJ system updates.

Brazil

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At GFT Technologies, I participated in the Bradesco project to update systems for the alphanumeric CNPJ, including COBOL impact analysis, program changes, JCL adjustments, and integration validation.

At Santander, I developed and maintained systems involving credit and debit notes, limits, registrations, and credentials, using COBOL, CICS, SQL, JCL, NATURAL, and DB2.

At Banco do Brasil, I worked on the cards and authorizer team, supporting online programs and specific requests. I also developed and tested software against client requirements and addressed system compatibility and performance issues.

Experience

Work history, roles, and key accomplishments

Analista Mainframe

GFT Technologies

Aug 2025 - May 2026 (9 months)

Participated in a project for Bradesco to update systems for alphanumeric CNPJ using AI, involving COBOL impact analysis, program changes, JCL adjustments, and validation of system integrations.

COBOL SQL JCL CICS Hexavision Jira

Analista Desenvolvedor l

Santander

Feb 2023 - Jun 2024 (1 year 4 months)

Worked with credit and debit notes, limits, registrations, and credentials. Developed and maintained systems in COBOL, CICS, SQL, JCL, NATURAL, and DB2, and participated in agile squads focused on web application testing.

COBOL CICS SQL JCL NATURAL DB2 KDZ SISBB TSO Roscoe Agile Scrum

Analista Desenvolvedor l

Banco do Brasil

Jan 2021 - Feb 2023 (2 years 1 month)

Worked in the cards and authorizer team (SDV), focusing on online programs and specific demands. Developed and tested software according to client requirements, ensuring efficiency and quality, and resolved system compatibility and performance issues.

COBOL CICS SQL JCL NATURAL DB2 Software Testing Problem Solving