Brian Macharia

Key Skills

Software

CVAT

Toloka

Labelbox

Top Subject Matter

Artificial Intelligence and Computer Vision

AI Training Dataset Preparation

Object Detection (Computer Vision)

Top Data Types

Image

Text

Top Task Types

Bounding Box

Classification

Freelancer Overview

Data Annotator / Image Labeller. Brings 9+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include CVAT, Toloka, and Labelbox. Education includes Certificate in Remote Pilot License, Astral Aeriel Solutions (2023) and Bachelor of Science, Jomo Kenyatta University of Technology and Agriculture (2023). AI-training focus includes data types such as Image and Text and labeling workflows including Bounding Box and Classification.

Labeling Experience

Image Annotation for Object Detection

CVATImageBounding Box

In the Image Annotation for Object Detection project, I annotated over 1,000 images using bounding boxes to identify vehicles, pedestrians, and road signs. I ensured the labeled data met high standards of accuracy and consistency for computer vision model training. My role included performing regular quality checks and correcting labeling errors. • Focused on object detection using bounding boxes. • Employed annotation tools suitable for computer vision tasks. • Improved annotation quality through diligent review practices. • Delivered substantial volumes of annotated data efficiently.

In the Image Annotation for Object Detection project, I annotated over 1,000 images using bounding boxes to identify vehicles, pedestrians, and road signs. I ensured the labeled data met high standards of accuracy and consistency for computer vision model training. My role included performing regular quality checks and correcting labeling errors. • Focused on object detection using bounding boxes. • Employed annotation tools suitable for computer vision tasks. • Improved annotation quality through diligent review practices. • Delivered substantial volumes of annotated data efficiently.

2026 - Present

Freelance Data Annotator

TolokaImageBounding Box

As a Freelance Data Annotator, I completed annotation tasks for platforms including Toloka, Aligner, Outlier, Remotasks, and Synapse Mind. My work focused on bounding boxes, segmentation, and classification for images, text, and speech datasets. I maintained a high accuracy rate and quickly adapted to new tools and instructions. • Worked on diverse data types including images, text, and audio. • Utilized Toloka and Remotasks systems for large-scale annotation. • Delivered consistent and accurate results across projects. • Ensured speed and reliability under varying project demands.

As a Freelance Data Annotator, I completed annotation tasks for platforms including Toloka, Aligner, Outlier, Remotasks, and Synapse Mind. My work focused on bounding boxes, segmentation, and classification for images, text, and speech datasets. I maintained a high accuracy rate and quickly adapted to new tools and instructions. • Worked on diverse data types including images, text, and audio. • Utilized Toloka and Remotasks systems for large-scale annotation. • Delivered consistent and accurate results across projects. • Ensured speed and reliability under varying project demands.

2025 - Present

Text Classification for Sentiment Analysis

LabelboxTextClassification

For Text Classification for Sentiment Analysis, I labeled text data by categorizing samples as positive, negative, or neutral to support NLP model training. I applied annotation guidelines to manage ambiguous data and improved dataset quality through reviews. My efforts contributed to more accurate sentiment analysis models. • Classified textual data for sentiment analysis. • Improved data reliability via review and correction. • Ensured consistent application of annotation guidelines. • Delivered clean, labeled text datasets for AI training.

For Text Classification for Sentiment Analysis, I labeled text data by categorizing samples as positive, negative, or neutral to support NLP model training. I applied annotation guidelines to manage ambiguous data and improved dataset quality through reviews. My efforts contributed to more accurate sentiment analysis models. • Classified textual data for sentiment analysis. • Improved data reliability via review and correction. • Ensured consistent application of annotation guidelines. • Delivered clean, labeled text datasets for AI training.

2025 - 2025

Data Annotator / Image Labeller

CVATImageBounding Box

As a Data Annotator and Image Labeller at Pallon, I labeled and annotated datasets including text, images, and audio for machine learning models. I ensured high accuracy and consistency across large datasets while maintaining quality standards. My work involved reviewing and correcting annotations and updating annotation guidelines. • Managed image, text, and audio labeling projects. • Used CVAT and Labelbox for image and text annotation. • Collaborated with AI engineers to improve dataset quality. • Maintained strict deadlines and handled high task volume.

As a Data Annotator and Image Labeller at Pallon, I labeled and annotated datasets including text, images, and audio for machine learning models. I ensured high accuracy and consistency across large datasets while maintaining quality standards. My work involved reviewing and correcting annotations and updating annotation guidelines. • Managed image, text, and audio labeling projects. • Used CVAT and Labelbox for image and text annotation. • Collaborated with AI engineers to improve dataset quality. • Maintained strict deadlines and handled high task volume.

2023 - 2024

Education

Work History