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Alejandro Castro

Alejandro Castro

Data Labeler

SPAIN flag
Madrid, Spain
$15.00/hrEntry LevelOther

Key Skills

Software

Other

Top Subject Matter

Machine Learning/Data Annotation
Legal Services & Contract Review
Regulatory Compliance & Risk Analysis

Top Data Types

TextText
ImageImage
DocumentDocument

Top Task Types

Classification

Freelancer Overview

I have been working with Outlier as a data annotator on a project-by-project basis since November 2024. While not on a regular basis, I have worked on Outlier projects called Pangolin and Aether, where the task—depending on whether it involves video, images, audio, or a combination of all three—is to label, classify, and clean data so that machine learning algorithms can interpret it and identify patterns and compare the two IA outputs to classify which response was better within the timeframes specified for each assignment. My combination of skills in administration, data, and translation makes me a versatile professional without a “one-size-fits-all” approach, with proven and consistent adaptability.

Entry LevelEnglishSpanish

Labeling Experience

Data Labeler

OtherTextClassification
As a Data Labeler at Outlier, I label, classify, and clean raw data spanning text, images, audio, and video formats for machine learning applications. My responsibilities include ensuring data integrity and accuracy, which supports pattern identification by algorithms. Data preparation tasks require rigorous attention to detail to maintain high labeling standards. • Performed labeling tasks on multimodal data including text, images, audio, and video • Supported data cleaning to ensure quality datasets for machine learning • Collaborated with team members to clarify ambiguous labeling guidelines • Focused on delivering precise and reliable labels for training robust AI models

As a Data Labeler at Outlier, I label, classify, and clean raw data spanning text, images, audio, and video formats for machine learning applications. My responsibilities include ensuring data integrity and accuracy, which supports pattern identification by algorithms. Data preparation tasks require rigorous attention to detail to maintain high labeling standards. • Performed labeling tasks on multimodal data including text, images, audio, and video • Supported data cleaning to ensure quality datasets for machine learning • Collaborated with team members to clarify ambiguous labeling guidelines • Focused on delivering precise and reliable labels for training robust AI models

2024 - Present

Education

T

The Power

Master of Science, Data Analytics

Master of Science
2024 - 2025
U

Universidad Metropolitana

Bachelor of Business Administration, Business Administration and Management

Bachelor of Business Administration
1997 - 2004

Work History

A

Alpha Crew

Crew Chief

Madrid
2025 - Present
F

Freelance

Audiovisual Translator

N/A
2017 - Present