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Mateus Costa

Mateus Costa

AI Language & Quality Evaluator - Technology & Internet

BRAZIL flag
Palmital, Brazil
IntermediateOther

Key Skills

Software

Other

Top Subject Matter

No subject matter listed

Top Data Types

TextText

Top Label Types

Prompt Response Writing SFT

Freelancer Overview

I am an experienced AI Language and Quality Evaluator specializing in the assessment, annotation, and refinement of AI-generated text for high-precision training data projects. My work focuses on ensuring linguistic accuracy, cultural relevance (Brazilian Portuguese), and factual consistency across a variety of domains, including sensitive areas such as law and compliance. I excel in structured evaluation tasks—such as ranking, rating, and guideline-based judgment—and have a strong background in Responsible AI practices, applying ethical, safety, and bias awareness standards throughout my workflows. With advanced written English skills and a detail-oriented approach, I consistently deliver reliable, high-quality annotations and evaluations in fully remote, asynchronous environments.

Intermediate

Labeling Experience

AI Content Specialist & LLM Trainer (Freelance)

OtherTextPrompt Response Writing SFT
Contributing to the development of Large Language Models (LLMs) by providing high-quality human feedback to support accuracy, safety, and usefulness in AI-generated outputs. Core Expertise: - Comparative Analysis (Ranking & Rating): Evaluating AI-generated responses based on prompt adherence, logical consistency, and formatting requirements. - Technical Review: Reviewing AI-generated outputs for accuracy, internal consistency, and adherence to project guidelines, without direct code development responsibilities. - Fact-Checking & Hallucination Mitigation: Verifying claims through structured research to ensure factual accuracy and reduce hallucinations in complex or sensitive domains. - Linguistic & Semantic Evaluation: Assessing tone, grammatical precision, and cultural relevance in Portuguese (BR) and English. - High-Stakes Content Review: Applying analytical rigor to evaluate responses in sensitive areas such as law, ethics, and compliance, aligned with Responsible AI principle

Contributing to the development of Large Language Models (LLMs) by providing high-quality human feedback to support accuracy, safety, and usefulness in AI-generated outputs. Core Expertise: - Comparative Analysis (Ranking & Rating): Evaluating AI-generated responses based on prompt adherence, logical consistency, and formatting requirements. - Technical Review: Reviewing AI-generated outputs for accuracy, internal consistency, and adherence to project guidelines, without direct code development responsibilities. - Fact-Checking & Hallucination Mitigation: Verifying claims through structured research to ensure factual accuracy and reduce hallucinations in complex or sensitive domains. - Linguistic & Semantic Evaluation: Assessing tone, grammatical precision, and cultural relevance in Portuguese (BR) and English. - High-Stakes Content Review: Applying analytical rigor to evaluate responses in sensitive areas such as law, ethics, and compliance, aligned with Responsible AI principle

2024

Education

No Education added yet

Mateus C. hasn’t added any Education History to their OpenTrain profile yet.

Work History

N

N/A

Digital Communication & Content Review Specialist

N/A
2016 - 2020