Hillary Mahura

Key Skills

Software

Sama

Labelbox

CVAT

Top Subject Matter

Quality Assurance

AI Data Annotation

AI Training Data

Top Data Types

Image

Video

Text

Audio

Document

Top Task Types

Segmentation

Prompt + Response Writing (SFT)

Freelancer Overview

Quality Analyst. Brings 2+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Sama, Labelbox, and CVAT. Education includes Certificate, SamaSchool (2018) and Kenya Certificate of Secondary Education, K.A.G M.C.DC Secondary School (2012). AI-training focus includes data types such as Image, Video, and Text and labeling workflows including Evaluation, Rating, and Segmentation.

Labeling Experience

Quality Analyst

SamaImage

Performed quality reviews on image, video, and text datasets to ensure accurate annotation and consistency. Evaluated annotator outputs, identified errors, and implemented corrective measures to support project objectives. Implemented audits and tracked quality metrics to drive continuous improvement initiatives. • Conducted audits and provided actionable feedback. • Ensured standardization for bounding box and polygon labels. • Collaborated on refining annotation guidelines. • Supported high-quality outputs through compliance checks.

Performed quality reviews on image, video, and text datasets to ensure accurate annotation and consistency. Evaluated annotator outputs, identified errors, and implemented corrective measures to support project objectives. Implemented audits and tracked quality metrics to drive continuous improvement initiatives. • Conducted audits and provided actionable feedback. • Ensured standardization for bounding box and polygon labels. • Collaborated on refining annotation guidelines. • Supported high-quality outputs through compliance checks.

2019 - 2026

AI Data Annotation Specialist

LabelboxImageSegmentation

Annotated image, video, text, and audio datasets with a high degree of accuracy and consistency for model development. Applied bounding box, polygon, and segmentation techniques in object detection and data classification tasks. Managed guideline adherence and performed data reviews for quality assurance in large-scale labeling projects. • Utilized platforms such as Labelbox and CVAT for annotation tasks. • Reviewed and corrected annotated data for project compliance. • Addressed and escalated inconsistencies to ensure dataset integrity. • Met tight deadlines while handling complex datasets.

Annotated image, video, text, and audio datasets with a high degree of accuracy and consistency for model development. Applied bounding box, polygon, and segmentation techniques in object detection and data classification tasks. Managed guideline adherence and performed data reviews for quality assurance in large-scale labeling projects. • Utilized platforms such as Labelbox and CVAT for annotation tasks. • Reviewed and corrected annotated data for project compliance. • Addressed and escalated inconsistencies to ensure dataset integrity. • Met tight deadlines while handling complex datasets.

2022 - 2025

Advanced AI Data Trainer

LabelboxImagePrompt Response Writing SFT

Trained and supported annotators on complex AI labeling assignments to improve overall accuracy and output consistency. Conducted prompt evaluation, refinement, and developed annotation guidelines that reduced errors for multimodal datasets. Reviewed and validated annotated data, ensuring high-quality training sets for AI model enhancement. • Managed over 400,000+ data points using Labelbox, CVAT, and SRT. • Led team training on new annotation protocols. • Maintained strict quality standards across all reviewed data. • Implemented process improvements for workflow efficiency.

Trained and supported annotators on complex AI labeling assignments to improve overall accuracy and output consistency. Conducted prompt evaluation, refinement, and developed annotation guidelines that reduced errors for multimodal datasets. Reviewed and validated annotated data, ensuring high-quality training sets for AI model enhancement. • Managed over 400,000+ data points using Labelbox, CVAT, and SRT. • Led team training on new annotation protocols. • Maintained strict quality standards across all reviewed data. • Implemented process improvements for workflow efficiency.

2023 - 2024

Education

Work History