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Diogo Saraiva

Diogo Saraiva

Expert AI Data Trainer

Portugal flagBragança, Portugal
$15.00/hrIntermediateAppenData Annotation TechMercor

Key Skills

Software

AppenAppen
Data Annotation TechData Annotation Tech
MercorMercor
Scale AIScale AI

Top Subject Matter

No subject matter listed

Top Data Types

Computer Code ProgrammingComputer Code Programming
DocumentDocument
TextText

Top Task Types

Audio Recording
Classification
Computer Programming Coding
Data Collection
Prompt Response Writing SFT

Freelancer Overview

With hands-on experience in AI training and data annotation, I have contributed to the development and refinement of machine-learning models through high-quality labeling, evaluation, and prompt-based interaction. At Scale AI, I work on training and testing AI systems for everyday reasoning tasks, ensuring accuracy, consistency, and adherence to detailed guidelines — skills that translate directly to high-performance data operations in AI projects. My background as a computer technician, combined with a strong foundation in computer engineering, gives me a technical edge when dealing with structured datasets, problem-solving workflows, and quality-driven evaluation processes. Fluent in English, Portuguese, and Spanish, I bring adaptability and precision to multilingual projects. My mix of technical knowledge, analytical thinking, and practical AI training experience allows me to deliver reliable, detail-oriented data labeling that helps improve model performance at scale.

IntermediateEnglishSpanishPortuguese

Labeling Experience

Scale AI

Audio Labeling Expertise

Scale AIAudioPrompt Response Writing SFTAudio Recording
The project consists of generating large sets of natural-sounding, short conversational lines designed for audio recording, each capped at roughly 20 seconds, and written as if someone is speaking casually to a friend. These lines fall into different categories such as: Humorous & lighthearted conversations Casual social interactions Narrative & story-sharing moments Romantic & interpersonal connection For each category, the lines must be written with different emotional tones, including: Neutral Happiness Sadness Anger (Occasionally boredom, confusion, melancholy, etc.) The purpose is to create high-quality, realistic, non-artificial monologues that: Feel spontaneous and conversational Avoid “prompt-like” structures Avoid robotic, over-detailed or overly specific phrasing Sound like something a real person would naturally say in daily life

The project consists of generating large sets of natural-sounding, short conversational lines designed for audio recording, each capped at roughly 20 seconds, and written as if someone is speaking casually to a friend. These lines fall into different categories such as: Humorous & lighthearted conversations Casual social interactions Narrative & story-sharing moments Romantic & interpersonal connection For each category, the lines must be written with different emotional tones, including: Neutral Happiness Sadness Anger (Occasionally boredom, confusion, melancholy, etc.) The purpose is to create high-quality, realistic, non-artificial monologues that: Feel spontaneous and conversational Avoid “prompt-like” structures Avoid robotic, over-detailed or overly specific phrasing Sound like something a real person would naturally say in daily life

2025 - 2025

Education

I

Instituto Politécnico De Bragança

Bachelor's in Computer Science, on-going Master in Business, Computer Science

Bachelor's in Computer Science, on-going Master in Business
2021 - 2024

Work History

S

Scale AI

AI Data Trainer

Washington
2024 - Present