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John

John

Full-Stack Developer - Software Development

Kenya flagNAIROBI, Kenya
$20.00/hrIntermediateAws SagemakerClickworkerCrowdsource

Key Skills

Software

AWS SageMakerAWS SageMaker
ClickworkerClickworker
CrowdSourceCrowdSource
MercorMercor
MindriftMindrift
OneFormaOneForma
Data Annotation TechData Annotation Tech

Top Subject Matter

No subject matter listed

Top Data Types

Computer Code ProgrammingComputer Code Programming

Top Task Types

Computer Programming Coding

Freelancer Overview

I am a detail-oriented full-stack developer with strong experience in designing and implementing structured test cases, integration tests, and end-to-end validation workflows for AI-integrated web applications. My background includes building Python-based backends and React frontends, with a focus on realistic data scenarios, edge case analysis, and robust error handling. I have hands-on expertise in simulating real-world constraints such as missing or malformed input, and I am skilled at evaluating system behavior to ensure high-quality, reliable training data. My experience with tools like Pytest, Docker, and GitHub Actions enables me to automate and validate data labeling and annotation processes efficiently, making me well-equipped to contribute to AI training data and quality assurance projects.

IntermediateSwahiliFrenchEnglish

Labeling Experience

Data Annotation Tech

Autonomous Vehicle Object Detection & Annotation Project

Data Annotation TechImageBounding BoxSegmentation
Annotated over 45,000 street-level images for a computer vision model used in autonomous driving systems. Responsibilities included: Drawing precise bounding boxes for vehicles, pedestrians, cyclists, traffic signs, and road obstacles Performing pixel-level semantic segmentation for road lanes and sidewalks Classifying objects by category and sub-category (e.g., emergency vehicle vs. private vehicle) Conducting quality assurance checks to maintain ≥98% annotation accuracy Maintained strict adherence to annotation guidelines, performed inter-annotator agreement reviews, and corrected edge-case inconsistencies such as occlusions and motion blur scenarios. Improved model training precision by ensuring high-quality, bias-reduced labeled datasets.

Annotated over 45,000 street-level images for a computer vision model used in autonomous driving systems. Responsibilities included: Drawing precise bounding boxes for vehicles, pedestrians, cyclists, traffic signs, and road obstacles Performing pixel-level semantic segmentation for road lanes and sidewalks Classifying objects by category and sub-category (e.g., emergency vehicle vs. private vehicle) Conducting quality assurance checks to maintain ≥98% annotation accuracy Maintained strict adherence to annotation guidelines, performed inter-annotator agreement reviews, and corrected edge-case inconsistencies such as occlusions and motion blur scenarios. Improved model training precision by ensuring high-quality, bias-reduced labeled datasets.

2024 - 2024

Education

J

jomo kenyatta university

bachelor in computer science, computer science

bachelor in computer science
2020 - 2024

Work History

F

Freelance

Full-Stack Developer

Nairobi
2023 - Present