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Sebastian Sepulveda

Sebastian Sepulveda

LLM, Audio and Video Annotator & Evaluator, Bilingual (English & Spanish)

Argentina flagPuerto Madryn, Argentina
$30.00/hrEntry LevelData Annotation TechLabelbox

Key Skills

Software

Data Annotation TechData Annotation Tech
LabelboxLabelbox

Top Subject Matter

No subject matter listed

Top Data Types

AudioAudio
TextText
VideoVideo

Top Task Types

Evaluation Rating
Fine Tuning
Prompt Response Writing SFT
RLHF

Freelancer Overview

Experienced high quality audio and text annotator, with experience in both English and bilingual English-Spanish workflows. I contributed to many different projects in RLHF, fine-tuning and voice activity detection tasks, also reviewing/curating data for some of those. I am a very detail-oriented professional with high proficiency in both English and Spanish, also highly time-efficient and thoughtful of the importance of data quality and reliability for AI systems.

Entry LevelEnglishSpanish

Labeling Experience

Labelbox

Audio Annotation (English)

LabelboxAudioAction Recognition
Audio annotation for LLMs regarding human and AI voice activity detection, along with transcription and quality assurance regarding recordings.

Audio annotation for LLMs regarding human and AI voice activity detection, along with transcription and quality assurance regarding recordings.

2025
Data Annotation Tech

LLM Evaluation (Bilingual English-Spanish)

Data Annotation TechTextRLHFFine Tuning
Various text annotation workflows regarding LLMs performance on different areas such as instruction-following, truthfulness, safety, verbosity and localization. I performed both annotation and reviewing tasks.

Various text annotation workflows regarding LLMs performance on different areas such as instruction-following, truthfulness, safety, verbosity and localization. I performed both annotation and reviewing tasks.

2025
Data Annotation Tech

Video Annotation for LLMs (English)

Data Annotation TechVideoFine Tuning
Video and text annotation for LLMs, particularly creating criteria for the fine-tuning of those models. I performed both labeling and reviewing tasks along the project.

Video and text annotation for LLMs, particularly creating criteria for the fine-tuning of those models. I performed both labeling and reviewing tasks along the project.

2025 - 2025

Education

U

Universidad Tecnológica Nacional

Associate's Degree, Occupational Health and Safety

Associate's Degree
2024 - 2024

Work History

No Work History added yet

Sebastian S. hasn’t added any Work History to their OpenTrain profile yet.