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Abraham Chala

Abraham Chala

Front-End Developer

Ethiopia flagAddis Ababa, Ethiopia
$25.00/hrExpertLabel StudioLabelboxScale AI

Key Skills

Software

Label StudioLabel Studio
LabelboxLabelbox
Scale AIScale AI
ProdigyProdigy
CVATCVAT
SuperviselySupervisely

Top Subject Matter

Technology AI Training, Data Annotation & Machine Learning
Software Development Web Applications & Front-End Systems
E-commerce Product Data, User Experience & Content Classification

Top Data Types

Computer Code ProgrammingComputer Code Programming

Top Task Types

Computer Programming/CodingComputer Programming/Coding

Freelancer Overview

Front-End Developer. Brings 6+ years of professional experience across complex professional workflows, research, and quality-focused execution. Education includes Bachelor of Science, Addis Ababa Science and Technology University (2025).

ExpertEnglish

Labeling Experience

AI trainer at revelo Claude AI

Computer Code ProgrammingComputer Programming Coding
I have worked on multiple data labeling and annotation projects, particularly focused on improving AI model performance and output quality. AI Training & Prompt Annotation (Claude AI – Revelo Platform): I contributed to training large language models by creating, refining, and evaluating prompts and responses. This included ranking outputs, correcting inaccuracies, and applying structured guidelines to improve reasoning, coherence, and factual correctness. Text Annotation & Classification: Labeled datasets for NLP tasks such as sentiment analysis, intent classification, and content moderation. I ensured consistency by following strict annotation guidelines and resolving ambiguous cases with logical reasoning. Data Quality Review & Validation: Performed quality checks on annotated datasets to ensure accuracy and reduce bias. This involved cross-checking labels, identifying inconsistencies, and suggesting improvements to annotation workflows. Structured Data Formatting: Organized and annotated data into structured formats (JSON/CSV) for machine learning pipelines, ensuring it was clean, standardized, and ready for training. These experiences have strengthened my attention to detail, ability to follow complex guidelines, and understanding of how high-quality labeled data directly impacts AI model performance.

I have worked on multiple data labeling and annotation projects, particularly focused on improving AI model performance and output quality. AI Training & Prompt Annotation (Claude AI – Revelo Platform): I contributed to training large language models by creating, refining, and evaluating prompts and responses. This included ranking outputs, correcting inaccuracies, and applying structured guidelines to improve reasoning, coherence, and factual correctness. Text Annotation & Classification: Labeled datasets for NLP tasks such as sentiment analysis, intent classification, and content moderation. I ensured consistency by following strict annotation guidelines and resolving ambiguous cases with logical reasoning. Data Quality Review & Validation: Performed quality checks on annotated datasets to ensure accuracy and reduce bias. This involved cross-checking labels, identifying inconsistencies, and suggesting improvements to annotation workflows. Structured Data Formatting: Organized and annotated data into structured formats (JSON/CSV) for machine learning pipelines, ensuring it was clean, standardized, and ready for training. These experiences have strengthened my attention to detail, ability to follow complex guidelines, and understanding of how high-quality labeled data directly impacts AI model performance.

2026 - 2026

Education

A

Addis Ababa Science and Technology University

Bachelor of Science, Computer Science

Bachelor of Science
2021 - 2025

Work History

V

Various Clients

Front-End Developer

Addis Ababa
2023 - Present
V

Various Clients

Front-End / Web Developer

Addis Ababa
2021 - 2022