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Chelsea Castro

Chelsea Castro

AI Data Specialist | Expert Annotator for ML Model Development

Indonesia flagNorth Jakarta, Indonesia
$15.00/hrEntry LevelAws SagemakerAxiom AIDatasaur

Key Skills

Software

AWS SageMakerAWS SageMaker
Axiom AI
DatasaurDatasaur
Internal/Proprietary Tooling

Top Subject Matter

No subject matter listed

Top Data Types

DocumentDocument
TextText

Top Task Types

Data Collection
Emotion Recognition
Mapping
Segmentation
Translation Localization

Freelancer Overview

My experience combines AI training data and data labeling with a strong foundation in market research, particularly in social media listening, document analysis, and e-commerce strategy development. I specialize in structuring complex datasets into actionable insights, ensuring both the accuracy of labeled data and its alignment with broader business and strategic objectives.

Entry LevelEnglishIndonesianChinese Mandarin

Labeling Experience

Market Research Analyst

Internal Proprietary ToolingDocumentSegmentationMapping
I collaborated with UNEP-FI Indonesia on a project analyzing literature reviews related to greenwashing, with the objective of understanding sentiment depth, thematic patterns, and stakeholder perspectives. The scope involved consolidating and reviewing a broad set of documents, then developing a structured map and codebook to categorize recurring themes and narratives. My specific tasks included document annotation, sentiment labeling, and coding instances of potential greenwashing to ensure consistency across the dataset. Quality was maintained through iterative codebook refinement, validation checks, and peer review, ensuring accuracy, inter-annotator reliability, and robustness in the final outputs.

I collaborated with UNEP-FI Indonesia on a project analyzing literature reviews related to greenwashing, with the objective of understanding sentiment depth, thematic patterns, and stakeholder perspectives. The scope involved consolidating and reviewing a broad set of documents, then developing a structured map and codebook to categorize recurring themes and narratives. My specific tasks included document annotation, sentiment labeling, and coding instances of potential greenwashing to ensure consistency across the dataset. Quality was maintained through iterative codebook refinement, validation checks, and peer review, ensuring accuracy, inter-annotator reliability, and robustness in the final outputs.

2024 - 2025

Education

I

Indonesia AI

Certificate, Machine Learning

Certificate
2024 - 2024
S

Sekolah Digital Cilsy

Certificate, Data Engineering

Certificate
2023 - 2023

Work History

I

Ipsos Strategy3

Market Research Analyst

Jakarta
2023 - Present
S

Self Employment

Freelance Data Contractor

Jakarta
2022 - Present