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AI Engineer, ML Engineer and Data Scientist with 8 years of experience building and shipping production-grade machine learning and LLM systems. Strong background in classical data science (fraud, churn, forecasting, A/B testing) paired with hands-on production AI: agentic workflows, RAG systems, LLM fine-tuning, evaluation frameworks, LLMOps, and observability. Experienced in responsible AI practices, model monitoring, drift detection, and governance/guardrails that make AI reliable in production. Proven ability to deliver measurable business impact and to translate complex technical work into clear stakeholder outcomes.…AI Engineer, ML Engineer and Data Scientist with 8 years of experience building and shipping production-grade machine learning and LLM systems. Strong background in classical data science (fraud, churn, forecasting, A/B testing) paired with hands-on production AI: agentic workflows, RAG systems, LLM fine-tuning, evaluation frameworks, LLMOps, and observability. Experienced in responsible AI practices, model monitoring, drift detection, and governance/guardrails that make AI reliable in production. Proven ability to deliver measurable business impact and to translate complex technical work into clear stakeholder outcomes.

JEFERSON SANTANA

AI Engineer, Data Scientist, Data Engineer

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AI Engineer, ML Engineer and Data Scientist with 8 years of experience building and shipping production-grade machine learning and LLM systems. Strong background in classical data science (fraud, churn, forecasting, A/B testing) paired with hands-on production AI: agentic workflows, RAG systems, LLM fine-tuning, evaluation frameworks, LLMOps, and observability. Experienced in responsible AI practices, model monitoring, drift detection, and governance/guardrails that make AI reliable in production. Proven ability to deliver measurable business impact and to translate complex technical work into clear stakeholder outcomes.…AI Engineer, ML Engineer and Data Scientist with 8 years of experience building and shipping production-grade machine learning and LLM systems. Strong background in classical data science (fraud, churn, forecasting, A/B testing) paired with hands-on production AI: agentic workflows, RAG systems, LLM fine-tuning, evaluation frameworks, LLMOps, and observability. Experienced in responsible AI practices, model monitoring, drift detection, and governance/guardrails that make AI reliable in production. Proven ability to deliver measurable business impact and to translate complex technical work into clear stakeholder outcomes.

Available to hire

AI Engineer, ML Engineer and Data Scientist with 8 years of experience building and shipping production-grade machine learning and LLM systems. Strong background in classical data science (fraud, churn, forecasting, A/B testing) paired with hands-on production AI: agentic workflows, RAG systems, LLM fine-tuning, evaluation frameworks, LLMOps, and observability.

Experienced in responsible AI practices, model monitoring, drift detection, and governance/guardrails that make AI reliable in production. Proven ability to deliver measurable business impact and to translate complex technical work into clear stakeholder outcomes.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Portuguese

Fluent

English

Advanced

Spanish; Castilian

Beginner

French

Beginner

Work Experience

Senior AI Engineer / Senior Data Scientist — AI Engineer at TOTVS

November 1, 2025 - July 1, 2026

Built end-to-end LLM-powered agentic AI systems: design, deployment, evaluation, and observability infrastructure to keep them reliable in production. Developed evaluation frameworks (eval datasets, LLM-as-judge, threshold scoring) and responsible AI guardrails to catch quality regressions before release. Implemented LLMOps tooling including prompt versioning under CI/CD, tracing, cost and drift monitoring, model monitoring dashboards, and rollback paths across agent runs. Shipped a GCP Vertex AI RAG-based KPI question-answering agent and an LLM form auto-completion field-suggestion agent using OpenAI and Claude models. Reduced customer churn by 3–12% via production observability and remediation of failure modes. Engineered an LLM traffic guardrails gateway with PII detection and redaction, applying governance and data protection principles.

Data Scientist at Aquila Consulting

January 1, 2025 - November 1, 2025

Portion of Aquila role spanning 2023–2025, including production ML delivery for forecasting, optimization, and modelling initiatives, plus stakeholder collaboration and mentoring responsibilities.

Senior Data Scientist at Aquila Consulting

November 1, 2023 - November 1, 2025

Cut client logistics costs 11–18% with route optimization models deployed via AWS using end-to-end ML pipelines. Built billing recommendation and payment likelihood models for a major banking client to enable personalised billing strategies. Delivered demand forecasting (time series) and price optimization models with drift detection and production monitoring. Built legal document generation using LLMs, RAG, and fine-tuned models; also developed computer vision models (PyTorch) for service validation. Managed executive stakeholder relationships by scoping ambiguous business problems into structured analytical solutions and mentored junior data scientists on production ML best practices and evaluation standards.

Data Scientist at Paraná Banco

August 1, 2023 - November 1, 2023

Built customer segmentation models for retail banking portfolios to support targeting and pricing decisions.

Junior Data Scientist at MRV & Co

July 1, 2022 - August 1, 2023

Reduced fraud-related losses 17–23% using a production fraud detection model with XGBoost and feature stores. Built churn prediction models to support retention efforts and route optimization for field operations, deployed on AWS with model monitoring.

Planning Trainee → Planning & Project Engineer at Usiminas

October 1, 2018 - June 1, 2022

Managed data science projects including sales forecasting and coordinated end-to-end delivery between technical teams and business stakeholders. Progressed from trainee to engineer, leading industrial planning with quantitative analysis, scheduling, and performance measurement at scale.

Electrical & Control Panel Assembler at 3Phase Power Systems

January 1, 2018 - January 1, 2018

Control & Automation Intern → Project Assistant at Autêntica Engenharia

January 1, 2016 - January 1, 2017

Commercial Agent → Manager Assistant at Itaú Unibanco

January 1, 2013 - January 1, 2015