Charles M.

Key Skills

Software

Other

Top Subject Matter

Computer vision datasets for AI/ML training

NLP and conversational AI datasets

content moderation

Top Data Types

Image

Text

Audio

Document

Top Task Types

Classification

Entity (NER) Classification

Transcription

RLHF

Bounding Box

Freelancer Overview

AI Data Annotation & Labeling Freelancer (Upwork, Remote). Brings 5+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Other. Education includes Kenya Certificate of Secondary Education, Kitui School (2019) and Kenya Certificate of Primary Education, Ithumbi Primary School (2015). AI-training focus includes data types such as Image, Text, and Audio and labeling workflows including Classification, Entity (NER) Classification, and Transcription.

Labeling Experience

AI Data Annotation & Labeling Freelancer (Upwork, Remote)

OtherAudioTranscription

Contributed to automatic speech recognition training by completing audio transcription and speech labeling tasks. • Labeled audio inputs to produce transcription-ready annotations for ASR pipelines. • Ensured outputs met relevance and accuracy expectations aligned with client guidelines. • Provided structured feedback on AI-generated outputs when required for evaluation/rating processes. • Maintained high QA performance through guideline adherence.

2024 - Present

AI Data Annotation & Labeling Freelancer (Upwork, Remote)

OtherImageClassification

Delivered 50+ data annotation and labeling projects for international AI/ML clients while maintaining Top-Rated status. • Performed image classification for computer vision training datasets. • Annotated objects using bounding-box labeling and supported segmentation workflows. • Ensured QA pass rates above 95% by following client annotation guidelines. • Evaluated AI-generated outputs for relevance, accuracy, and safety and provided feedback for RLHF-style improvements.

2024 - Present

Conversational AI Feedback (Upwork freelance project)

OtherTextRLHF

Performed evaluation/feedback labeling for conversational AI to support RLHF workflows. • Rated chatbot responses for coherence and helpfulness using consistent criteria. • Assessed safety and policy alignment and flagged unsafe or non-compliant outputs. • Provided structured feedback used to refine model behavior. • Ensured labeling accuracy to support high-volume evaluation tasks.

2023 - 2023

Digital Freelancer – Data & AI Tasks (Ajira Digital Programme)

OtherTextEntity (NER) Classification

Completed certified digital freelancing and undertook data & AI labeling micro-tasks for local and international clients. • Labeled text data for conversational AI by applying tone, intent, and policy compliance checks. • Created and reviewed NLP annotations including NER, sentiment, and intent labels for language-model training. • Supported AI content review by flagging harmful or misleading content under safety guidelines. • Focused on annotation consistency and quality during remote platform-based workflows.

2022 - 2023

Medical Image Annotation (Upwork freelance project)

OtherBounding Box

Completed medical image annotation for healthcare AI research datasets. • Labeled X-ray and MRI regions of interest (ROIs) to support model training. • Followed strict medical annotation protocols to ensure consistency and clinical relevance. • Applied quality checks aligned with annotation guidelines for accurate ROI delineation. • Documented and delivered labeled outputs suitable for downstream training and evaluation.

2022 - 2022

Education

Work History