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Arthur Mwangangi

Data Annotator & AI Training Contributor

Kenya flagNairobi, Kenya
$20.00/hrExpertOtherClickworkerAxiom AI

Key Skills

Software

Other
ClickworkerClickworker
Axiom AI
ArgillaArgilla
AppenAppen
Anno-MageAnno-Mage
AWS SageMakerAWS SageMaker
CVATCVAT
Data Annotation TechData Annotation Tech
CrowdSourceCrowdSource
RemotasksRemotasks
MindriftMindrift
MercorMercor
Internal/Proprietary Tooling
SuperAnnotateSuperAnnotate
RoboflowRoboflow
Scale AIScale AI
Micro1
Label StudioLabel Studio
TolokaToloka
Surge AISurge AI
SuperviselySupervisely

Top Subject Matter

General Domain Expertise
AI Language Models
Computer Vision

Top Data Types

ImageImage
TextText
DocumentDocument

Top Task Types

ClassificationClassification
Bounding BoxBounding Box
Entity (NER) ClassificationEntity (NER) Classification
RLHFRLHF
Prompt + Response Writing (SFT)Prompt + Response Writing (SFT)
TranscriptionTranscription
Data CollectionData Collection
Text SummarizationText Summarization
Question AnsweringQuestion Answering
Text GenerationText Generation
Object DetectionObject Detection
Function CallingFunction Calling

Freelancer Overview

Data Annotator & AI Training Contributor. Brings 8+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Other. Education includes Bachelor of Science, University (2025). AI-training focus includes data types such as Image and Text and labeling workflows including Classification, Bounding Box, and Entity (NER) Classification.

ExpertEnglish

Labeling Experience

Data Annotator & AI Training Contributor

OtherImageClassificationBounding Box
Performed data annotation including text labeling, image classification, bounding box annotation, sentiment tagging, and entity recognition for machine learning datasets. Created high-quality prompt-response pairs for AI language model training and evaluated AI-generated outputs for fluency, accuracy, and logical consistency using RLHF methodologies. Applied Computer Science knowledge to model behavior, annotation schemas, and data quality, ensuring precise, consistent output in a high-volume, remote workflow. • Annotated images and text data for supervised learning pipelines. • Crafted diverse prompts and responses for SFT in language models. • Implemented RLHF annotations and evaluated model outputs methodically. • Adhered to strict quality compliance for large data annotation projects.

Performed data annotation including text labeling, image classification, bounding box annotation, sentiment tagging, and entity recognition for machine learning datasets. Created high-quality prompt-response pairs for AI language model training and evaluated AI-generated outputs for fluency, accuracy, and logical consistency using RLHF methodologies. Applied Computer Science knowledge to model behavior, annotation schemas, and data quality, ensuring precise, consistent output in a high-volume, remote workflow. • Annotated images and text data for supervised learning pipelines. • Crafted diverse prompts and responses for SFT in language models. • Implemented RLHF annotations and evaluated model outputs methodically. • Adhered to strict quality compliance for large data annotation projects.

2023 - Present

Education

U

University

Bachelor of Science, Computer Science

Bachelor of Science
2019 - 2025

Work History

F

Freelance

Graphic Designer

Nairobi
2020 - Present
F

Freelance

Photo & Video Editor

Nairobi
2020 - Present