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Fred Cheruiyot

Fred Cheruiyot

Freelance Technical Specialist - Education & Data Integrity

KENYA flag
nyeri, Kenya
$20.00/hrExpertAppenClickworkerCVAT

Key Skills

Software

AppenAppen
ClickworkerClickworker
CVATCVAT
Data Annotation TechData Annotation Tech
DataloopDataloop
Kili TechnologyKili Technology

Top Subject Matter

No subject matter listed

Top Data Types

DocumentDocument
ImageImage
TextText
VideoVideo

Top Label Types

Classification
Entity Ner Classification
Evaluation Rating
Object Detection
Polygon
RLHF
Transcription
Translation Localization

Freelancer Overview

​I am a highly analytical AI Training Specialist and Data Annotator with over three years of experience delivering high-fidelity datasets for global industry leaders on Appen, UHRS, Upwork, and Fiverr. My background in Education Science (majoring in Physics) provides me with a unique advantage in the RLHF (Reinforcement Learning from Human Feedback) space; I apply scientific rigor, logical consistency, and mathematical precision to every task, ensuring that model outputs are not only accurate but factually sound. ​Throughout my career, I have mastered a wide array of annotation modalities, including Search Relevance, Image/Polygon Annotation, and Sentiment Analysis. I am an expert at navigating complex labeling guidelines and maintaining a "Gold Standard" accuracy rating (95%+) under tight deadlines. My experience across multiple platforms has made me highly adaptable to various labeling interfaces and quality-control workflows. I am dedicated to eliminating model bias and improving AI helpfulness through meticulous data integrity and clear, evidence-based feedback.

ExpertEnglishSwahili

Labeling Experience

Appen

Data Annotation Specialist | Upwork & Fiverr

AppenImageClassification
As a Data Annotation Specialist on Upwork & Fiverr, I managed detailed image annotation tasks for scientific and technical data projects. These projects required precise application of labeling guidelines, particularly for physics-based and technical datasets. I helped startups enhance the accuracy of AI models through specialized annotation workflows. • Delivered high-quality image annotations for AI-focused clients. • Specialized in scientific and technical domain data labeling. • Developed actionable workflows for complex project guidelines. • Maintained strict deadlines and quality standards as a top-rated annotator.

As a Data Annotation Specialist on Upwork & Fiverr, I managed detailed image annotation tasks for scientific and technical data projects. These projects required precise application of labeling guidelines, particularly for physics-based and technical datasets. I helped startups enhance the accuracy of AI models through specialized annotation workflows. • Delivered high-quality image annotations for AI-focused clients. • Specialized in scientific and technical domain data labeling. • Developed actionable workflows for complex project guidelines. • Maintained strict deadlines and quality standards as a top-rated annotator.

2023
Appen

AI Data Specialist (Contractor) | Appen & UHRS

AppenTextEvaluation Rating
As an AI Data Specialist at Appen & UHRS, I contributed to training and evaluating large language models through a wide range of micro-tasks. These responsibilities included high-accuracy rating of search results and the collection of unbiased ground truth datasets. My work focused especially on applying technical expertise to reinforce model performance and reliability. • Judged search relevance using established user intent guidelines. • Performed high-precision RLHF tasks for LLM fine-tuning. • Participated in ground truth data collection to support bias-free datasets. • Achieved excellent quality scores across thousands of rated tasks.

As an AI Data Specialist at Appen & UHRS, I contributed to training and evaluating large language models through a wide range of micro-tasks. These responsibilities included high-accuracy rating of search results and the collection of unbiased ground truth datasets. My work focused especially on applying technical expertise to reinforce model performance and reliability. • Judged search relevance using established user intent guidelines. • Performed high-precision RLHF tasks for LLM fine-tuning. • Participated in ground truth data collection to support bias-free datasets. • Achieved excellent quality scores across thousands of rated tasks.

2023

Education

K

Karatina University

Bachelor of Education, Physics and Chemistry

Bachelor of Education
2022 - 2025

Work History

U

Upwork

Technical Freelancer

Nairobi
2023 - Present