Open to opportunities

Roberto Nunhes Fernandes Filho

@robertonunhesfernand

Message

Senior Oracle developer modernizing mission-critical systems and building AI-assisted SaaS products end to end.

Brazil

Message

What I'm looking for

I’m looking to build and modernize mission-critical Oracle systems and real SaaS products end to end—owning integrations, performance tuning, and operational dashboards—while applying AI-assisted engineering responsibly in a reliability-first culture.

I’m a Senior Oracle Developer with 15+ years building, sustaining, and modernizing mission-critical enterprise systems across banking, retail, industry, healthcare, and energy. I’ve spent nearly five years evolving high-criticality Oracle platforms at Citibank, improving integrations, validating critical financial data, and strengthening SWIFT payment flows.

Before that, I led Oracle projects for companies including Hering, Bunge, Philips, Engie, Seara, Unimed, JBS, and Castrolanda—delivering MRP tools, cost-simulation systems, and fiscal/reporting solutions such as SPED, EFD, and IN86 layouts. I’m hands-on with performance tuning, troubleshooting, UAT, and deployments in demanding, always-on environments.

In parallel, I built Vitrini, an independent operational SaaS for intelligence and dashboards, using React + TypeScript and a FastAPI + PostgreSQL backend. I integrate LLMs to produce natural-language insights from structured business data, with JWT auth and LGPD-compliant multi-role architecture.

Experience

Work history, roles, and key accomplishments

Current

Founder & Developer

Current

Vitrini

Jan 2026 - Present (5 months)

Founded and built Vitrini, an AI-assisted operational SaaS, using Python, FastAPI, PostgreSQL, React, and TypeScript. Implemented LLM-powered REST endpoints for natural-language insights, plus a multi-role React UI with JWT authentication and LGPD compliance.

Python fastAPI React 18+TypeScript PostgreSQL REST APIs JWT SaaS architecture LGPD Compliance

Current

Senior Oracle Developer

Current

Stefanini

Jul 2021 - Present (4 years 11 months)

Developed and maintained mission-critical Oracle PL/SQL systems for SWIFT payment flows, IOF tax-rate calculation, and duplicate-payment validation. Designed TXT/XML-based integrations and led 24/7 troubleshooting, UAT, deployments, and performance-tuning using Git and Jira.

Oracle PL SQL Advanced SQL Performance Tuning SWIFT Payment Flows Data Validation Git Jira

Systems Analyst (Oracle)

EBDS Sistemas

Feb 2019 - Jul 2021 (2 years 5 months)

Owned Oracle PL/SQL, Forms, and Reports for Castrolanda’s Agricultural Inputs ERP and Inputs Portal. Designed and evolved high-volume fiscal integrations with Cargill and Dreyfus using PL/SQL, SSIS, C#, and Integration Services to reduce integration failures and improve processing performance.

Oracle PL SQL Oracle Reports Advanced SQL SSIS Fiscal Integrations ERP Troubleshooting Performance Tuning Compliance Support

Systems Analyst & Tech Lead

Amcom Sistemas De Informação

Jan 2016 - Nov 2018 (2 years 10 months)

Delivered Oracle ERP integration and performance engineering projects for enterprise clients, including Hering, Philips, Bunge, Engie, Seara, Unimed, and Ailos. Served as Tech Lead and Scrum Master on a CECRED performance-tuning initiative, delivering ~60% faster execution of daily critical routines, and built an MRP and cost-simulation system for Hering.

ERP Integration Oracle PL SQL Performance Engineering SQL Scrum MRP Cost Simulation Jira

Java ERP Systems Analyst

TNT Technology

Jul 2015 - Dec 2015 (5 months)

Developed and maintained the supply-management module of an educational ERP, supporting daily institutional operations with Java enterprise applications. Implemented business rules and supported the production environment with a focus on stability and operational consistency.

Java ERP Business Rules Production Support Debugging Operational Consistency

Oracle Developer

Amcom Sistemas De Informação

Feb 2012 - Jul 2015 (3 years 5 months)

Provided Oracle consulting (PL/SQL, Forms, Reports) for healthcare, energy, food, and retail clients, building end-to-end fiscal and government-reporting solutions for SPED Fiscal, EFD, IN86, ISS, and DIMI layouts. Developed ERP integrations across Tasy, SIOMED, EDI, and VALE and implemented legal/logistics/distribution-center access-governance modules (Multi ADM).

Oracle PL SQL Oracle Reports Sped Fiscal EFD IN86 Layouts ISS DIMI SEFAZ Protocol 46I ERP Integration Tasy SIOMED VALE

Oracle Developer

JBS

Aug 2011 - Nov 2012 (1 year 3 months)

Developed and maintained Oracle PL/SQL applications supporting JBS corporate industrial factory-floor processes across the group. Implemented business rules and continuous improvements to enterprise applications used in daily industrial workflows.

Oracle PL SQL Business Rules Enterprise Application Support Continuous Improvement Troubleshooting

Oracle Developer

Flora Higiene E Limpeza S/A

Dec 2009 - Sep 2011 (1 year 9 months)

Owned the Hygiene & Cleaning factory system for JBS/Johnson & Johnson operations and supported a milestone self-release certification. Maintained Oracle integrations with external industrial equipment and supported 20+ branches across Brazil and abroad to keep operations consistent.

Operational Consistency Multi Branch Support Oracle PL SQL