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Sabina Macharia

Sabina Macharia

Quality Analyst

KENYA flag
Nairobi, Kenya
$10.00/hrExpertCVATLabelboxRemotasks

Key Skills

Software

CVATCVAT
LabelboxLabelbox
RemotasksRemotasks
SamaSama
Scale AIScale AI

Top Subject Matter

AI Data Annotation Quality Assurance
AI Data Annotation for Machine Learning
Legal Services & Contract Review

Top Data Types

AudioAudio
ImageImage
TextText
VideoVideo
DocumentDocument

Top Task Types

Audio Recording
Bounding Box
Cuboid
Object Detection
Segmentation
Classification

Freelancer Overview

Quality Analyst. Core strengths include Labelbox, SRT, and CVAT. AI-training focus includes data types such as Image, Video, and Text and labeling workflows including Evaluation, Rating, and Classification.

ExpertEnglish

Labeling Experience

Sama

Data Labeling and Annotation for AI Training

SamaImageBounding BoxPolygon
The project primarily focused on video footage and images captured by an ego car equipped with cameras mounted on the front, back, or both sides. This setup was designed to capture a range of environments, including urban, rural, highway, and tunnel settings, to aid the autonomous vehicle in real-time object detection and scene understanding. I collaborated with a team of 300 annotators and 10 Quality Analysts, working on over a million+ images and videos, totaling more than 600 hours of annotation. The task involved creating polygons and cuboids around various objects, such as buildings, lane markings, pedestrians, vehicles, traffic signs, and natural elements. Each label was assigned a different color for easy differentiation. We also labelled occluded or partially visible objects to enhance the model's robustness. Consistent and accurate tracking of objects across video frames was ensured. Additionally, we implemented a QA SLA of 98%.

The project primarily focused on video footage and images captured by an ego car equipped with cameras mounted on the front, back, or both sides. This setup was designed to capture a range of environments, including urban, rural, highway, and tunnel settings, to aid the autonomous vehicle in real-time object detection and scene understanding. I collaborated with a team of 300 annotators and 10 Quality Analysts, working on over a million+ images and videos, totaling more than 600 hours of annotation. The task involved creating polygons and cuboids around various objects, such as buildings, lane markings, pedestrians, vehicles, traffic signs, and natural elements. Each label was assigned a different color for easy differentiation. We also labelled occluded or partially visible objects to enhance the model's robustness. Consistent and accurate tracking of objects across video frames was ensured. Additionally, we implemented a QA SLA of 98%.

2020 - 2025
Labelbox

Data Annotator

LabelboxImageClassification
As a Data Annotator at Samasource, I accurately labeled and categorized images, text, audio, and video data. I ensured all data labeling adhered to detailed project guidelines and high accuracy standards. I worked to continually improve annotation speed and reduce individual error rates through collaboration and feedback. • Labeled and categorized 800-1200 data items across various formats. • Maintained annotation accuracy above 98%. • Actively participated in team review and feedback sessions. • Used software tools such as Labelbox and CVAT to perform and correct annotations.

As a Data Annotator at Samasource, I accurately labeled and categorized images, text, audio, and video data. I ensured all data labeling adhered to detailed project guidelines and high accuracy standards. I worked to continually improve annotation speed and reduce individual error rates through collaboration and feedback. • Labeled and categorized 800-1200 data items across various formats. • Maintained annotation accuracy above 98%. • Actively participated in team review and feedback sessions. • Used software tools such as Labelbox and CVAT to perform and correct annotations.

2018 - 2019

Education

A

ACK Mukengesya Secondary School

Certificate, K.C.S.E

Certificate
Not specified
I

Institute of Data Technology

Certificate, IcDL

Certificate
Not specified

Work History

S

Sama

Quality Analyst

Nairobi, Nairobi
2020 - 2025
S

Sama

Data Annotator

Nairobi
2018 - 2020