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Ephey Nyaga

Ephey Nyaga

Data Annotation and AI Training Specialist - Technology & Internet

KENYA flag
Nairobi, Kenya
$30.00/hrExpertEncordGoogle Cloud Vertex AILabelimg

Key Skills

Software

EncordEncord
Google Cloud Vertex AIGoogle Cloud Vertex AI
LabelImgLabelImg
Label StudioLabel Studio
OpenCV AI Kit (OAK)OpenCV AI Kit (OAK)
ProdigyProdigy

Top Subject Matter

No subject matter listed

Top Data Types

AudioAudio
Computer Code ProgrammingComputer Code Programming
ImageImage
TextText

Top Label Types

Action Recognition
Audio Recording
Classification
Computer Programming Coding
Fine Tuning
Function Calling
Prompt Response Writing SFT
Segmentation
Transcription
Translation Localization

Freelancer Overview

I am an experienced Data Annotation and AI Training Specialist with a strong background in labeling and structuring large-scale datasets for NLP, computer vision, and speech applications. My work includes annotating over a million data points with 99%+ accuracy, designing comprehensive annotation guidelines, and leading quality assurance initiatives that consistently improve dataset precision and inter-annotator agreement. I have extensive hands-on experience in intent classification, entity recognition, sentiment analysis, and multilingual audio transcription, as well as content moderation and bias detection to ensure ethical AI outcomes. My expertise spans the full data lifecycle, from dataset auditing and validation to taxonomy design and human-in-the-loop model training, always prioritizing data quality, privacy, and compliance. I am passionate about building high-quality, balanced datasets that drive robust AI model performance across diverse domains.

ExpertEnglishSwahili

Labeling Experience

LabelImg

Content Moderation & Data Categorization Specialist

LabelimgTextAction RecognitionFunction Calling
The project belonged to an AI content creation firm, focused on building structured moderation datasets to support responsible AI deployment across digital content ecosystems.

The project belonged to an AI content creation firm, focused on building structured moderation datasets to support responsible AI deployment across digital content ecosystems.

2025 - 2025
Encord

Transcription & Linguistics Data Specialist

EncordAudioTranslation LocalizationAudio Recording
The lab was focused on preparing high-quality multilingual speech datasets fopr training and evaluating ASR systems.

The lab was focused on preparing high-quality multilingual speech datasets fopr training and evaluating ASR systems.

2024 - 2025
Prodigy

Senior Data Labeling Analyst

ProdigyTextSegmentationClassification
The project was a research driven Ai organization specializing in conversational model training and chatbot training and optimization. Led annotation of structured dialogue datasets for multi-intent classification and response ranking systems.

The project was a research driven Ai organization specializing in conversational model training and chatbot training and optimization. Led annotation of structured dialogue datasets for multi-intent classification and response ranking systems.

2024 - 2024
Label Studio

Data Annotation Specialist

Label StudioAudioClassificationTranscription
The company was a (and it is till now) a global ai data services provider supporting machine learning ,model development across Natural Language Processing and computer vision domains. The organization specializes in large-scale dataset annotation, taxonomy design, and quality assurance workflows for enterprise AI deployment.

The company was a (and it is till now) a global ai data services provider supporting machine learning ,model development across Natural Language Processing and computer vision domains. The organization specializes in large-scale dataset annotation, taxonomy design, and quality assurance workflows for enterprise AI deployment.

2023 - 2023

Education

U

University of Nairobi

Bachelor of Arts, Linguistics

Bachelor of Arts
2016 - 2021

Work History

A

Ai Agent Developer

AI Software Developer

Nairobi
2025 - Present
T

Tann Man Gaadi organization

Senior Backend Lead Engineer

Mubai
2024 - 2025