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Joel Kimani

Joel Kimani

AI Data Labeler - Large Language Model

KENYA flag
Nairobi, Kenya
$18.00/hrIntermediateCVATMindriftScale AI

Key Skills

Software

CVATCVAT
MindriftMindrift
Scale AIScale AI
TolokaToloka

Top Subject Matter

No subject matter listed

Top Data Types

Computer Code ProgrammingComputer Code Programming
ImageImage
TextText
VideoVideo

Top Label Types

Classification
Entity Ner Classification
Evaluation Rating
Object Detection
Red Teaming
RLHF
Segmentation

Freelancer Overview

I am an experienced AI data labeler and RLHF rater with over two years of hands-on work training large language models through high-quality data annotation, response ranking, and safety evaluation. My expertise spans advanced NLP annotation, multimodal labeling for text, images, and video, as well as hallucination detection and detailed semantic feedback to optimize model performance. I am skilled in evaluating Python and SQL code for correctness and clarity, maintaining strict quality standards across thousands of labeled examples, and documenting every decision for transparency and consistency. My technical toolkit includes RLHF annotation platforms, n8n, Apify, and Google Workspace, and I thrive in fast-paced environments that demand precision, reliability, and a deep understanding of AI data workflows.

IntermediateEnglishSwahili

Labeling Experience

Toloka

AI-Generated Code Quality Review

TolokaComputer Code ProgrammingClassification
Reviewed AI-generated Python and SQL code snippets for correctness, clarity, and structure. Evaluated code quality, identified errors, and provided detailed feedback to improve code generation models.

Reviewed AI-generated Python and SQL code snippets for correctness, clarity, and structure. Evaluated code quality, identified errors, and provided detailed feedback to improve code generation models.

2025 - 2025
Toloka

RLHF & AI Response Quality Evaluation

TolokaTextClassification
valuated and ranked AI-generated responses for quality, factual accuracy, safety, and policy compliance. Performed preference ranking across thousands of prompt-response pairs to improve LLM performance. Identified hallucinations, harmful content, and style inconsistencies.

valuated and ranked AI-generated responses for quality, factual accuracy, safety, and policy compliance. Performed preference ranking across thousands of prompt-response pairs to improve LLM performance. Identified hallucinations, harmful content, and style inconsistencies.

2024 - 2025
CVAT

Multimodal Data Labeling (Images & Video)

CVATImageClassificationObject Detection
Labeled and categorized images and video content for computer vision models. Created detailed image descriptions, tagged objects, and performed quality checks on visual datasets. Ensured accuracy and consistency across large-scale multimodal annotation tasks.

Labeled and categorized images and video content for computer vision models. Created detailed image descriptions, tagged objects, and performed quality checks on visual datasets. Ensured accuracy and consistency across large-scale multimodal annotation tasks.

2024 - 2024

Education

P

PLP Academy

Specialization, Software Engineering

Specialization
2025 - 2025
U

University of Nairobi

Bachelor of Science, Mathematics & Chemistry

Bachelor of Science
2023 - 2023

Work History

K

Kimani BotLab

Founder & Automation Specialist

Nairobi
2025 - Present
D

Datum Analytics

Data Verification Specialist

Nairobi
2025 - 2026