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Valentino Navajas Jauregui

Valentino Navajas Jauregui

Data labeling and prompt engineering professional

Argentina flagLa Plata, Argentina
$10.00/hrIntermediateData Annotation TechMindriftToloka

Key Skills

Software

Data Annotation TechData Annotation Tech
MindriftMindrift
TolokaToloka
Other

Top Subject Matter

No subject matter listed

Top Data Types

AudioAudio
ImageImage
TextText

Top Task Types

Audio Recording
Classification
Fine Tuning
Prompt Response Writing SFT
Translation Localization

Freelancer Overview

With hands-on experience in data annotation, prompt evaluation, and AI model training, I believe I can contribute meaningfully to your team’s mission of delivering high-quality linguistic and AI solutions. In my current role at DataAnnotation.tech, I work remotely on projects involving transcription validation, prompt rating, and reviewing AI-generated content in both English and Spanish. This position has honed my attention to detail, cross-cultural communication skills, and ability to follow strict guidelines while maintaining high productivity. My background in dental prosthetics gave me a solid foundation in precision and quality control, which I’ve successfully transferred to the tech space. I am passionate about the development of ethical and effective AI systems.

IntermediateEnglishSpanish

Labeling Experience

Audio Data Annotator

OtherAudioClassificationEmotion Recognition
labeling and creatively describing (in Spanish) various speech characteristics such as audio quality, voice traits, speaking style, and delivery details

labeling and creatively describing (in Spanish) various speech characteristics such as audio quality, voice traits, speaking style, and delivery details

2025
Data Annotation Tech

Prompt Engineer

Data Annotation TechTextFine TuningEvaluation Rating
Conducted prompt evaluation and rating for large language models, ensuring alignment with guidelines and improving response quality. Performed audio transcription review and correction, maintaining high accuracy for multilingual datasets. Labeled and categorized text data across multiple domains (customer service, general knowledge, technical content) to support natural language processing tasks. Provided quality assurance feedback on annotations, contributing to consistent training data and better model performance.

Conducted prompt evaluation and rating for large language models, ensuring alignment with guidelines and improving response quality. Performed audio transcription review and correction, maintaining high accuracy for multilingual datasets. Labeled and categorized text data across multiple domains (customer service, general knowledge, technical content) to support natural language processing tasks. Provided quality assurance feedback on annotations, contributing to consistent training data and better model performance.

2024

Education

U

Universidad Nacional de La Plata

Dental technician, odontology

Dental technician
2021 - 2023

Work History

D

DataAnnotation.tech

Prompt Engineering

Barcelona
2024 - Present
D

DataAnnotation.tech

Prompt Engineering

Barcelona
2024 - 2025