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Leonardo Villarroel

Leonardo Villarroel

Editorial Director - Publishing and Compliance

CHILE flag
Santiago, Chile
$15.00/hrExpertInternal Proprietary ToolingDon T Disclose

Key Skills

Software

Internal/Proprietary Tooling
Don't disclose

Top Subject Matter

No subject matter listed

Top Data Types

ImageImage
TextText
AudioAudio

Top Label Types

Data Collection
Emotion Recognition
Evaluation Rating
RLHF
Text Summarization

Freelancer Overview

I am an experienced data annotator and AI training data specialist with a strong background in linguistics, translation, and digital content creation. My work includes advanced quality assessment and annotation for AI projects at Invisible Technologies and RWS Moravia, with a focus on RLHF (Reinforcement Learning from Human Feedback) and SFT (Supervised Fine-Tuning). I have led teams for Outlier’s AI training initiatives and have hands-on experience coordinating interdisciplinary groups for data-centric projects. My expertise spans natural language processing, compliance research, and editorial oversight, supported by advanced proficiency in tools such as Trados, Slack, Trello, Google Analytics, and PowerBi. I am committed to delivering high-quality labeled data on strict deadlines and thrive in roles that require both precision and leadership.

ExpertEnglishSpanish

Labeling Experience

Advanced Data Trainer

Internal Proprietary ToolingImageEmotion Recognition
Data Labelling for AI-generated images, involving facial expression recognition and corrections.

Data Labelling for AI-generated images, involving facial expression recognition and corrections.

2025 - 2025

Data Annotator

Internal Proprietary ToolingAudioData Collection
Helped train an LLM in its voice recognition capabilities in Spanish. The project involved data collection and recording of samples as well as engineering conversations with up to 4 participants.

Helped train an LLM in its voice recognition capabilities in Spanish. The project involved data collection and recording of samples as well as engineering conversations with up to 4 participants.

2024 - 2024

Quality Control Analyst

Internal Proprietary ToolingTextText Summarization
Worked evaluating and revising the work of a large team of annotators that trained a text-based LLM on different tasks.

Worked evaluating and revising the work of a large team of annotators that trained a text-based LLM on different tasks.

2023 - 2023

Advanced Data Trainer

Don T DiscloseTextRLHF
Contrasted and compared LLMs responses to natural prompts, while also fine tuning and reinforcing different aspects of the model's behavior.

Contrasted and compared LLMs responses to natural prompts, while also fine tuning and reinforcing different aspects of the model's behavior.

2022 - 2023

Education

G

Georgetown University

Master of Fine Arts, English

Master of Fine Arts
2019 - 2021
P

Pontificia Universidad Católica de Chile

Bachelor of Arts, English Literature and Linguistics

Bachelor of Arts
2003 - 2007

Work History

L

Librería Felpecta

Editorial Director

Punta Arenas
2021 - Present
W

World Check-LSEG

Senior Research Analyst in Compliance

Punta Arenas
2013 - 2022