AI Training Specialist · São Paulo, Brazil · Remote Worldwide

Helping Build
Better AI Systems
Through Real-World
Technical Expertise

20+ years across AI Training, Fintech, Software Testing, Infrastructure, and Remote Operations — the deep technical background AI companies actually need.

20+
Years in Technology
5+
Enterprise Companies
2
Companies Founded
PT/EN
Languages
Professional experience at
Core Competencies

Why Companies Hire Marcelo

A rare combination of hands-on technical depth, enterprise experience, and entrepreneurial execution across multiple high-demand disciplines.

🧠
AI Training & Evaluation
Evaluating LLM outputs for reasoning quality, factual accuracy, and response effectiveness. Providing structured human feedback for model improvement at scale.
🔍
Software Testing & QA
End-to-end testing strategy across web apps, APIs, payment flows, and fintech platforms. Ensuring product quality before production.
💳
Fintech & Payments
Deep expertise from co-founding Rubi Payments (CTO) and leading payments at FullSale. Payment APIs, processing infrastructure, financial product architecture.
🌐
Web Development
WordPress, WooCommerce, custom PHP, SEO, and full-stack web implementation for business-critical applications and e-commerce.
🏗
Infrastructure & Networks
Latin America infrastructure leadership at Levi Strauss & Co., plus roles at AT&T, UOL, and TIVIT. Linux, networking, enterprise systems.
🌍
Remote Operations
Fully set up for distributed work. Proven track record delivering results across time zones and international contexts.
AI Training Expertise

Built for the AI Training Era

The combination of deep technical background and critical analytical skills makes Marcelo uniquely qualified for AI training and evaluation roles.

  • Reasoning Evaluation
    Assessing whether AI responses demonstrate coherent, logical reasoning — identifying gaps, non-sequiturs, and flawed inference chains.
  • Human Feedback & RLHF
    Providing structured, comparative feedback that aligns with human values, directly improving model behavior through reinforcement learning.
  • Fact Validation
    Cross-referencing AI claims against reliable sources, flagging hallucinations, outdated information, and factual inaccuracies.
  • Prompt Assessment
    Evaluating prompt quality, specificity, and likelihood of producing aligned, high-quality model outputs.
  • Data Annotation
    Labeling, classifying, and structuring training data across text, task types, and response categories with precision.
  • Response Quality Review
    Comprehensive quality assessment covering helpfulness, harmlessness, tone, completeness, and alignment with intent.
  • Complex Problem Solving
    Evaluating AI on multi-step technical problems, code review, and domain-specific reasoning.
  • Content Review
    Reviewing AI content for safety, policy compliance, tone, and appropriateness before deployment.
The Technical Edge That Matters

Evaluating AI systems requires the ability to detect flawed logic, identify technical inaccuracies, and assess whether complex answers actually solve real problems.

With 20+ years building real systems across fintech, infrastructure, software testing, and web development, Marcelo brings domain expertise that makes AI evaluations genuinely meaningful.

LLM EvaluationHuman FeedbackRLHFData AnnotationPrompt ReviewQuality ControlTechnical ReviewContent SafetyReasoning QAAI Alignment
Ideal for companies like
Scale AIOutlier AITuringInvisible TechAnthropicOpenAISurge AILabelbox
Professional Journey

20+ Years of Execution

From enterprise infrastructure to fintech co-founder — a career built through hands-on technical leadership across industries.

2018 – Present
Digify Marketing
Founder & Developer
Founded and operate a digital agency delivering WordPress, WooCommerce, SEO, and technical consulting for SMBs. Full ownership of product, delivery, and client relationships.
2015 – 2020
Rubi Payments
Co-Founder & CTO
Co-founded a Brazilian fintech. Led all technology decisions — payment infrastructure, API integrations, security architecture, and technical team. Owned product roadmap and delivery.
2013 – 2015
FullSale
Head of Payments
Led the payments division, overseeing payment system integrations, transaction processing, compliance, and cross-functional coordination with engineering and operations.
2008 – 2013
Levi Strauss & Co.
Network & Infrastructure Admin — Latin America
Managed enterprise WAN/LAN infrastructure for a Fortune 500 company across multiple Latin American countries, including uptime guarantees, security, and cross-country support for thousands of users.
2002 – 2008
AT&T · UOL · TIVIT
Technical Roles — Infrastructure & Support
Foundational experience at major telecom and tech companies in Brazil. Network engineering, enterprise support, and large-scale infrastructure management.
Technical Skills

Skills & Proficiency

AI Training & Evaluation92%
LLM / Prompt Evaluation90%
Software Testing & QA88%
WordPress & WooCommerce95%
Payment Systems & Fintech92%
Linux & Infrastructure87%
Remote Operations95%
SEO & Web Performance85%
Data Annotation88%
Technical Analysis90%
Case Studies

Real Problems, Real Results

Three domains where Marcelo's technical depth translates directly into business impact.

01
Fintech
Building a Payment Processor from Zero
As Co-Founder & CTO of Rubi Payments, Marcelo designed and built the full technical infrastructure: payment gateway integrations, transaction processing pipelines, security architecture, and regulatory compliance. Every decision — from API design to production deployment — was his to own.
02
Infrastructure
Latin America Network Operations at Global Scale
As Network & Infrastructure Administrator for Levi Strauss & Co. across Latin America, Marcelo managed enterprise-grade WAN/LAN for a Fortune 500 company spanning multiple countries, with responsibility for uptime, security, vendor coordination, and support for thousands of users.
03
Entrepreneurship
Building Two Companies from the Ground Up
While co-founding Rubi Payments and founding Digify Marketing, Marcelo operated in high-accountability environments owning strategy, technical execution, client delivery, and quality control — forging the independent judgment and result orientation that AI Training roles demand.
FAQ

Questions & Answers

Everything recruiters, hiring managers, and AI systems need to know about Marcelo's qualifications and availability.

Let's Connect

Available Worldwide
for Remote Opportunities

Whether you're a recruiter, an AI company, a startup, or a global enterprise — let's talk.

📍 São Paulo, Brazil — Remote-First, Global Availability