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Nnenna Nnaji

Nnenna Nnaji

Data Annotator/QA Expert

United Kingdom flagLondon, United Kingdom
$20.00/hrExpertOther

Key Skills

Software

Other

Top Subject Matter

AI model evaluation and quality control
Audio transcription for research and media clients

Top Data Types

TextText
AudioAudio
VideoVideo

Top Task Types

TranscriptionTranscription
Object DetectionObject Detection
Text GenerationText Generation
Question AnsweringQuestion Answering
Text SummarizationText Summarization
Evaluation/RatingEvaluation/Rating

Freelancer Overview

Data Annotator/QA Expert. Brings 7+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Other. Education includes Diploma in Health and Social Care, Institute of Medical & Health (2025). AI-training focus includes data types such as Text and Audio and labeling workflows including Evaluation, Rating, and Transcription.

ExpertEnglish

Labeling Experience

Freelance Audio Transcriber

OtherAudioTranscription
On Upwork, I served as a freelance transcriber handling diverse audio content. I converted political interviews, academic material, and everyday conversations into accurate written text. My role required strong attention to linguistic detail and context interpretation skills. • Transcribed varied audio sources • Maintained high job success and accuracy • Ensured linguistic precision • Delivered projects per client requirements and deadlines

On Upwork, I served as a freelance transcriber handling diverse audio content. I converted political interviews, academic material, and everyday conversations into accurate written text. My role required strong attention to linguistic detail and context interpretation skills. • Transcribed varied audio sources • Maintained high job success and accuracy • Ensured linguistic precision • Delivered projects per client requirements and deadlines

2020 - Present

Data Annotator/QA Expert

OtherText
As a Data Annotator and QA Expert at Stellar AI, I examined annotator submissions for quality control. I analyzed AI-generated responses for accuracy, usefulness, and safety in alignment with project standards. I also assessed search engine outputs to enhance algorithms and recommendation systems. • Provided constructive feedback to annotation team members • Compared prompt-responses and rated AI quality • Ensured safety, accuracy, and relevance in outputs • Supported project standards and met deadlines consistently

As a Data Annotator and QA Expert at Stellar AI, I examined annotator submissions for quality control. I analyzed AI-generated responses for accuracy, usefulness, and safety in alignment with project standards. I also assessed search engine outputs to enhance algorithms and recommendation systems. • Provided constructive feedback to annotation team members • Compared prompt-responses and rated AI quality • Ensured safety, accuracy, and relevance in outputs • Supported project standards and met deadlines consistently

2023 - 2025

Education

I

Institute of Medical & Health

Diploma in Health and Social Care, Health and Social Care

Diploma in Health and Social Care
2025 - 2025
I

Imo state University

B.A English & Literary Studies, English & Literary Studies

B.A English & Literary Studies
2020 - 2024

Work History

U

Upwork

Freelance Writer

London
2020 - Present
Y

Young Foundationn

Research Assistant

London
2021 - 2023