Sam J.

Key Skills

Software

Labelbox

Other

Top Subject Matter

Computer vision labeling and dataset quality assurance

NLP and speech recognition training data annotation

Applied ML pipeline development and evaluation in an analytics lab

Top Data Types

Image

Text

Document

Top Task Types

Object Detection

Entity (NER) Classification

Classification

Freelancer Overview

Data Annotation Specialist — Labelbox Africa Solutions (Nairobi). Brings 3+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Labelbox, N, and A. Education includes Bachelor of Science, Multimedia University of Kenya (2025) and Certification Program, Moringa School (2025). AI-training focus includes data types such as Image, Text, and Computer Code and labeling workflows including Object Detection, Entity (NER) Classification, and Evaluation.

Labeling Experience

Data Annotation Specialist — Labelbox Africa Solutions (Nairobi)

LabelboxImageObject Detection

Performed precise image classification and object detection annotation for computer vision models, maintaining 98%+ accuracy throughout the labeling workflow. Conducted quality reviews and validation checks to identify and correct annotation inconsistencies before dataset release. Collaborated with ML teams to iterate on labeling guidelines and improve training data quality by 15%. • Image classification labeling • Object detection/bounding annotations • Quality assurance and validation • Guideline iteration with ML teams

2025 - Present

Data Science Intern — Moringa School Data Analytics Lab

Other

Built ML pipelines using Scikit-learn and TensorFlow to support predictive modeling and achieve 87% prediction accuracy. Developed reporting dashboards to communicate outcomes and performance for stakeholders. Applied ML training and evaluation practices aligned with analytics lab workflows. • ML pipeline development with Scikit-learn/TensorFlow • Predictive modeling and evaluation (87% accuracy) • Stakeholder reporting dashboards • Applied ML training support

2025 - 2025

AI Training Data Specialist — DataKind Kenya (Nairobi)

TextEntity (NER) Classification

Annotated text data for NLP and speech recognition model training while processing 500+ samples per week. Ensured compliance with annotation standards and contributed feedback to refine labeling guidelines. Helped develop datasets supporting local language AI models for East Africa. • Text annotation for NLP • Speech-related training data labeling • Standards compliance and guideline feedback • Dataset development for local-language AI

2025 - 2025

Data Analytics Intern — McDave Holdings Limited

OtherClassification

Built ML models for equipment failure prediction to reduce downtime by 15%. Developed and delivered Power BI dashboards to support equipment and operational insights. Contributed to the end-to-end analytics process from modeling through reporting. • ML model development for failure prediction • Predictive modeling and improvement cycle • Power BI dashboard creation • Outcome-focused analytics (downtime reduction)

2024 - 2024

Education

Work History