Fred Cheruiyot

Key Skills

Software

Appen

Clickworker

CVAT

Data Annotation Tech

Dataloop

Kili Technology

Top Subject Matter

No subject matter listed

Top Data Types

Document

Image

Text

Video

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.

Labeling Experience

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

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

Work History