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Japhet Mati

Japhet Mati

AI trainer, Data Labeler and annotator

Kenya flagEmbu, Kenya
$10.00/hrIntermediateCVATData Annotation TechLabelbox

Key Skills

Software

CVATCVAT
Data Annotation TechData Annotation Tech
LabelboxLabelbox
Label StudioLabel Studio
RemotasksRemotasks
RoboflowRoboflow
OneFormaOneForma
MindriftMindrift
ClickworkerClickworker

Top Subject Matter

General AI/ML
Data science - analyst
Information technology -computer vision

Top Data Types

VideoVideo
ImageImage
TextText

Top Task Types

Classification
Segmentation
Evaluation Rating
Object Detection
Bounding Box
Prompt Response Writing SFT

Freelancer Overview

Data Labeler at Atlas Capture. Brings 1+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Other. Education includes Bachelor of Education Science, Kirinyaga University (2023) and Certificate of Secondary Education, Magomano Secondary (2022). AI-training focus includes data types such as Video, Image, and Text and labeling workflows including Classification, Evaluation, and Rating.

IntermediateEnglishSwahili

Labeling Experience

Data Labeler at Atlas Capture

OtherVideoClassification
As a data labeler at Atlas Capture, I labeled and annotated videos for AI model training. My work contributed to enhancing the accuracy and robustness of machine learning algorithms. Tasks required careful identification and categorization of objects and actions. • Annotated video frames for key event detection • Ensured consistency and accuracy in labeling • Collaborated with team members to maintain quality standards • Provided feedback for potential workflow improvements

As a data labeler at Atlas Capture, I labeled and annotated videos for AI model training. My work contributed to enhancing the accuracy and robustness of machine learning algorithms. Tasks required careful identification and categorization of objects and actions. • Annotated video frames for key event detection • Ensured consistency and accuracy in labeling • Collaborated with team members to maintain quality standards • Provided feedback for potential workflow improvements

2026 - Present

AI Evaluation at Aether

OtherText
As an AI evaluator with Aether, I performed AI response evaluation and comparison tasks. The focus was on assessing model-generated outputs for quality and relevance. Evaluation tasks improved the overall effectiveness of AI model responses. • Compared AI-generated answers for quality assessment • Rated model outputs based on set guidelines • Pinpointed areas requiring model improvement • Maintained detailed records of assessments

As an AI evaluator with Aether, I performed AI response evaluation and comparison tasks. The focus was on assessing model-generated outputs for quality and relevance. Evaluation tasks improved the overall effectiveness of AI model responses. • Compared AI-generated answers for quality assessment • Rated model outputs based on set guidelines • Pinpointed areas requiring model improvement • Maintained detailed records of assessments

2024 - 2026

Data Annotation at Outlier

OtherImageClassification
At Outlier, I annotated images, text, and datasets for AI model training. This position focused on categorizing and labeling diverse data types to improve AI models. Precision and consistency were core requirements of my daily duties. • Labeled images with specific categories and features • Annotated text datasets for NLP tasks • Maintained high accuracy thresholds • Used internal annotation tools for assignments

At Outlier, I annotated images, text, and datasets for AI model training. This position focused on categorizing and labeling diverse data types to improve AI models. Precision and consistency were core requirements of my daily duties. • Labeled images with specific categories and features • Annotated text datasets for NLP tasks • Maintained high accuracy thresholds • Used internal annotation tools for assignments

2024 - 2026

AI Response Evaluation—Project

OtherText
In the AI Response Evaluation project, I carried out evaluation and comparison of AI-generated responses. My responsibilities included assessing outputs for correctness and providing structured feedback. This process played a key role in model refinement. • Evaluated model-generated text responses • Compared various AI outputs for ranking • Submitted quality assessments to development teams • Adhered strictly to predefined rating protocols

In the AI Response Evaluation project, I carried out evaluation and comparison of AI-generated responses. My responsibilities included assessing outputs for correctness and providing structured feedback. This process played a key role in model refinement. • Evaluated model-generated text responses • Compared various AI outputs for ranking • Submitted quality assessments to development teams • Adhered strictly to predefined rating protocols

2024

Image and Text Data Annotation—Project

OtherImageClassification
In my Image and Text Data Annotation project, I labeled and categorized over 100 images for machine learning. Accuracy and consistency were applied in all labeling tasks. This project contributed directly to model training workflows. • Assigned category labels to image datasets • Checked for inconsistencies or errors in labels • Participated in team review sessions • Provided suggestions for streamlining annotation practices

In my Image and Text Data Annotation project, I labeled and categorized over 100 images for machine learning. Accuracy and consistency were applied in all labeling tasks. This project contributed directly to model training workflows. • Assigned category labels to image datasets • Checked for inconsistencies or errors in labels • Participated in team review sessions • Provided suggestions for streamlining annotation practices

2024

Education

M

Magomano Secondary

Certificate of Secondary Education, General Secondary Education

Certificate of Secondary Education
2019 - 2022
K

Kirinyaga University

Bachelor of Education Science, Education Science, Mathematics and Chemistry

Bachelor of Education Science
2023

Work History

E

Embu County Governments

Data Entry Clerk

Embu
2025 - 2025