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Mary Onkoba

Mary Onkoba

Data Annotator (CipherSense)

Kenya flagNairobi, Kenya
$8.00/hrIntermediateOtherLabel StudioCVAT

Key Skills

Software

Other
Label StudioLabel Studio
CVATCVAT
DoccanoDoccano

Top Subject Matter

General Machine Learning Datasets
Supervised ML Datasets

Top Data Types

ImageImage
TextText
AudioAudio

Top Task Types

ClassificationClassification
Bounding BoxBounding Box
PolygonPolygon
Entity (NER) ClassificationEntity (NER) Classification
Point/Key PointPoint/Key Point
Object DetectionObject Detection
Text GenerationText Generation
Data CollectionData Collection
Text SummarizationText Summarization
SegmentationSegmentation
PolylinePolyline
CuboidCuboid

Freelancer Overview

Data Annotator (CipherSense). Brings 2+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Internal, Proprietary Tooling, and Other. Education includes Bachelor of Science, KWUST (2025) and Professional Certificate, Datalense Africa (2025). AI-training focus includes data types such as Image, Text, and Audio and labeling workflows including Classification.

IntermediateEnglishSwahili

Labeling Experience

Data Annotator (CipherSense)

ImageClassification
As a Data Annotator at CipherSense, I labeled over 15,000 images, text, and audio samples for supervised machine learning projects. I maintained a labeling accuracy above 98% and contributed to improving inter-annotator agreement by 30%. My responsibilities included creating annotation guidelines, developing QA workflows, and collaborating with ML engineers to enhance dataset quality. • Labeled and validated images, texts, and audio files for ML training • Created and refined annotation guidelines and QA checklists • Mentored new annotators and provided onboarding training • Conducted quality-control audits to sustain high consistency

As a Data Annotator at CipherSense, I labeled over 15,000 images, text, and audio samples for supervised machine learning projects. I maintained a labeling accuracy above 98% and contributed to improving inter-annotator agreement by 30%. My responsibilities included creating annotation guidelines, developing QA workflows, and collaborating with ML engineers to enhance dataset quality. • Labeled and validated images, texts, and audio files for ML training • Created and refined annotation guidelines and QA checklists • Mentored new annotators and provided onboarding training • Conducted quality-control audits to sustain high consistency

2025 - 2026

Data Annotation Trainee (Datalense Africa)

OtherImageClassification
I completed a short professional course in Data Labelling and Annotation with Datalense Africa, gaining practical experience in annotation workflows. The course focused on labeling images, text, and audio, emphasizing consistency and quality assurance. I learned to develop annotation guidelines and perform inter-annotator agreement reviews for supervised machine learning datasets. • Gained hands-on experience labeling images, text, and audio • Developed annotation guidelines and QA checklists • Conducted inter-annotator agreement reviews to ensure label quality • Used modern annotation tools in a simulation environment

I completed a short professional course in Data Labelling and Annotation with Datalense Africa, gaining practical experience in annotation workflows. The course focused on labeling images, text, and audio, emphasizing consistency and quality assurance. I learned to develop annotation guidelines and perform inter-annotator agreement reviews for supervised machine learning datasets. • Gained hands-on experience labeling images, text, and audio • Developed annotation guidelines and QA checklists • Conducted inter-annotator agreement reviews to ensure label quality • Used modern annotation tools in a simulation environment

2025 - 2025

Education

D

Datalense Africa

Professional Certificate, Data Labelling and Annotation

Professional Certificate
2025 - 2025
K

KWUST

Bachelor of Science, Statistics

Bachelor of Science
2021 - 2025

Work History

K

KEFRI

Data Entry and Research Assistant

Nairobi
2023 - 2024