Earl Castañares

Key Skills

Software

Labelbox

Top Subject Matter

AI Model Training

Natural Language Processing

AI Model Evaluation

Top Data Types

Text

Document

Top Task Types

Prompt + Response Writing (SFT)

Freelancer Overview

Freelance Content Writer and AI Trainer. Brings 2+ years of professional experience across legal operations, contract review, compliance, and structured analysis. Core strengths include Labelbox. Education includes Bachelor of Science, Asian International School of Aeronautics and Technology (2025). AI-training focus includes data types such as Text and labeling workflows including Prompt + Response Writing (SFT), Evaluation, and Rating.

Labeling Experience

Freelance Content Writer and AI Trainer

LabelboxTextPrompt Response Writing SFT

I produced guideline-compliant training examples and prompt templates for multiple short-term AI projects, focusing on improving model outputs. I designed prompts to reduce ambiguity and contributed annotated conversational and instructional texts to refine datasets. My work maintained high consistency with project-specific taxonomies and frequently involved QA collaboration. • Created 40-100 validated examples per week depending on project scope • Annotated and labeled conversational and instructional text datasets • Collaborated with QA specialists to refine guidelines and acceptance criteria • Used tools such as Labelbox and Prodigy for annotation and QA tasks

I produced guideline-compliant training examples and prompt templates for multiple short-term AI projects, focusing on improving model outputs. I designed prompts to reduce ambiguity and contributed annotated conversational and instructional texts to refine datasets. My work maintained high consistency with project-specific taxonomies and frequently involved QA collaboration. • Created 40-100 validated examples per week depending on project scope • Annotated and labeled conversational and instructional text datasets • Collaborated with QA specialists to refine guidelines and acceptance criteria • Used tools such as Labelbox and Prodigy for annotation and QA tasks

2023 - Present

Annotation Specialist and Team Lead

LabelboxText

I led crowdsourced annotation teams, focusing on the accuracy and sensitivity of labeled AI response data. I systematically assigned annotation tasks, reviewed quality samples, and developed structured checklists for edge case handling. My efforts led to an estimated 95% annotation accuracy on key projects and supported project managers with recommendations. • Led annotation team operations for quality assurance • Evaluated AI-generated responses for factual accuracy • Implemented systematic checklists to improve team annotations • Flagged content issues and refined guideline clarity

I led crowdsourced annotation teams, focusing on the accuracy and sensitivity of labeled AI response data. I systematically assigned annotation tasks, reviewed quality samples, and developed structured checklists for edge case handling. My efforts led to an estimated 95% annotation accuracy on key projects and supported project managers with recommendations. • Led annotation team operations for quality assurance • Evaluated AI-generated responses for factual accuracy • Implemented systematic checklists to improve team annotations • Flagged content issues and refined guideline clarity

2022 - 2023

Education

Work History