Kelsy O.

Key Skills

Software

Other

Internal/Proprietary Tooling

Label Studio

Top Subject Matter

Image, Text Annotation, Labeling and AI Evaluation

Reinforcement Learning from Human Feedback (RLHF)

Healthcare/ Machine Learning

Top Data Types

Image

Audio

Document

Text

Top Task Types

Bounding Box

Audio Recording

Classification

RLHF

Evaluation/Rating

Computer Programming/Coding

Fine-tuning

Text Summarization

Data Collection

Entity (NER) Classification

Freelancer Overview

Data Annotator and Collector (Freelancer). Brings 2 years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Data Annotation, Reinforcement Learning from Human Feedback in AI training experience, excellent written and verbal communication skills, an educational background in AI and machine learning, attention to detail and organization. Education includes Bachelor of Science, Jomo Kenyatta University of Agriculture and Technology (2024) and High School Diploma, Alliance Girls’ High School (2019). AI-training focus includes data types such as Image, Audio, Text and Document Annotation, and labeling workflows including Bounding Box, Audio Recording, and Classification, Reinforcement Learning from Human Feedback, AI evaluation, python coding.

Labeling Experience

Data Annotator and Collector (Freelancer)

Label StudioAudioBounding BoxAudio Recording

As a freelancer, I annotated and labeled large-scale image datasets using techniques such as bounding boxes, classification, and segmentation based on detailed annotation guidelines. I performed quality assurance reviews to confirm accuracy, consistency, and compliance with AI training standards. I also helped identify annotation errors and edge cases to improve dataset reliability. • Annotated images using bounding boxes, classification, and segmentation techniques. • Conducted quality checks to ensure data accuracy and consistency. • Identified and corrected errors and edge cases in image datasets. • Ensured labeling complied with AI training requirements.

2025 - Present

Speech Data Collector (Freelancer)

OtherTextAudio RecordingEntity (NER) Classification

I applied structured text annotation and prompt refinement techniques to enhance AI-generated website content. My work focused on improving consistency and accuracy in the AI's website-generation logic. I also evaluated AI outputs for logical flow, alignment, and reliability. • Annotated and refined website text using prompt engineering. • Evaluated AI-generated content for correctness and user intent. • Identified edge cases and proposed improvements in system output. • Documented annotation processes for quality assurance.

2025 - 2026

Final Year Project - Heart Disease Prediction Data Labeling

OtherDocumentClassification

I participated in data cleaning, labeling, annotation, and scenario evaluation for healthcare datasets in a machine learning project. I contributed to the creation of a high-accuracy heart disease prediction model by meticulously preparing data. I documented analytical results and ensured accuracy in labeled medical information. • Cleaned and labeled healthcare datasets for machine learning • Evaluated scenarios and validated label consistency • Helped achieve high precision in predictive model outputs • Produced detailed documentation for technical stakeholders

2023 - 2024

Education

Work History