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Obinna Njoku

Obinna Njoku

Freelance Data Annotation & AI Training Specialist

Nigeria flagLagos, Nigeria
ExpertOther

Key Skills

Software

Other

Top Subject Matter

General AI/ML
Content Evaluation
Audio/Speech Data

Top Data Types

ImageImage
AudioAudio
TextText
DocumentDocument

Top Task Types

ClassificationClassification
TranscriptionTranscription

Freelancer Overview

Freelance Data Annotation & AI Training Specialist. Brings 6+ years of professional experience across legal operations, contract review, compliance, and structured analysis. Core strengths include Other and Otter.ai. Education includes Diploma in Advertising, O2 Academy Lagos - School of Advertising (2018) and Bachelor of Science, Michael Okpara University of Agriculture (2015). AI-training focus includes data types such as Image, Audio, and Text and labeling workflows including Classification, Transcription, and Evaluation.

Expert

Labeling Experience

Freelance Data Annotation & AI Training Specialist

OtherImageClassification
As a Freelance Data Annotation & AI Training Specialist, I performed labeling and categorization for both structured and unstructured machine learning datasets. My work included image annotation, text classification, prompt evaluation, and quality assurance for AI-generated outputs. I consistently adhered to detailed guidelines to ensure high-quality labeled data for model development and evaluation. • Categorized, tagged, and validated a wide range of datasets (images and texts). • Evaluated prompt-response pairs and ranked or reviewed AI outputs for accuracy and compliance. • Maintained project standards, workflow precision, and task accuracy under strict deadlines. • Completed large annotation and evaluation batches across distributed remote teams.

As a Freelance Data Annotation & AI Training Specialist, I performed labeling and categorization for both structured and unstructured machine learning datasets. My work included image annotation, text classification, prompt evaluation, and quality assurance for AI-generated outputs. I consistently adhered to detailed guidelines to ensure high-quality labeled data for model development and evaluation. • Categorized, tagged, and validated a wide range of datasets (images and texts). • Evaluated prompt-response pairs and ranked or reviewed AI outputs for accuracy and compliance. • Maintained project standards, workflow precision, and task accuracy under strict deadlines. • Completed large annotation and evaluation batches across distributed remote teams.

2023 - Present

Transcription Specialist (Freelance)

AudioTranscription
As a Transcription Specialist, I transcribed and annotated audio and video recordings, including interviews and podcasts. I provided speaker identification, timestamps, and proofread edits to ensure transcript clarity and integrity. The work involved editing both manual and machine-generated transcripts for high-quality linguistic data annotation. • Delivered clean verbatim and edited transcription formats for diverse audio sources. • Reviewed and corrected AI-generated transcripts to improve training data accuracy. • Used a variety of audio transcription and editing tools to process large datasets remotely. • Adhered to guidelines for consistent speaker labeling and accurate speech-to-text conversion.

As a Transcription Specialist, I transcribed and annotated audio and video recordings, including interviews and podcasts. I provided speaker identification, timestamps, and proofread edits to ensure transcript clarity and integrity. The work involved editing both manual and machine-generated transcripts for high-quality linguistic data annotation. • Delivered clean verbatim and edited transcription formats for diverse audio sources. • Reviewed and corrected AI-generated transcripts to improve training data accuracy. • Used a variety of audio transcription and editing tools to process large datasets remotely. • Adhered to guidelines for consistent speaker labeling and accurate speech-to-text conversion.

2022 - Present

Content Categorization Specialist (Project)

OtherTextClassification
In a Content Categorization Project, I classified large volumes of text data into defined sentiment, intent, and topic categories. This task involved careful assignment of class labels to support machine learning and NLP applications. I ensured each text item was correctly categorized according to strict project guidelines. • Labeled text entries based on nuanced sentiment and intent analysis. • Contributed to high-quality datasets for sentiment and topic modeling. • Maintained rigorous standards for inter-annotator agreement and accuracy. • Provided well-structured category data to support supervised learning models.

In a Content Categorization Project, I classified large volumes of text data into defined sentiment, intent, and topic categories. This task involved careful assignment of class labels to support machine learning and NLP applications. I ensured each text item was correctly categorized according to strict project guidelines. • Labeled text entries based on nuanced sentiment and intent analysis. • Contributed to high-quality datasets for sentiment and topic modeling. • Maintained rigorous standards for inter-annotator agreement and accuracy. • Provided well-structured category data to support supervised learning models.

Not specified

AI Prompt Evaluator (Project)

OtherText
For AI Prompt Evaluation Projects, I assessed and rated AI-generated text responses based on helpfulness, tone, correctness, and compliance using set rubrics. My work involved comparing and ranking model outputs to facilitate reinforcement learning from human feedback (RLHF). This evaluation directly contributed to refining conversational and content moderation AI models. • Ranked and compared AI responses for relevance, factual accuracy, and guideline adherence. • Leveraged structured evaluation rubrics in various prompt-response review tasks. • Improved safety, relevance, and overall quality of AI-generated texts. • Supported RLHF and prompt optimization for LLMs.

For AI Prompt Evaluation Projects, I assessed and rated AI-generated text responses based on helpfulness, tone, correctness, and compliance using set rubrics. My work involved comparing and ranking model outputs to facilitate reinforcement learning from human feedback (RLHF). This evaluation directly contributed to refining conversational and content moderation AI models. • Ranked and compared AI responses for relevance, factual accuracy, and guideline adherence. • Leveraged structured evaluation rubrics in various prompt-response review tasks. • Improved safety, relevance, and overall quality of AI-generated texts. • Supported RLHF and prompt optimization for LLMs.

Not specified

Speech Data Validator (Project)

OtherAudio
I participated in speech data validation projects, reviewing audio samples for transcription quality, accuracy, and pronunciation consistency. My tasks included verifying linguistic features across speech datasets to support robust AI model training. This work directly impacted the creation of high-quality transcribed datasets for voice and speech recognition. • Evaluated audio data for linguistic correctness, clarity, and alignment with guidelines. • Validated and rated speech samples for annotation quality and consistency. • Provided feedback to improve speech-to-text and pronunciation models. • Ensured dataset accuracy for downstream AI/ML applications.

I participated in speech data validation projects, reviewing audio samples for transcription quality, accuracy, and pronunciation consistency. My tasks included verifying linguistic features across speech datasets to support robust AI model training. This work directly impacted the creation of high-quality transcribed datasets for voice and speech recognition. • Evaluated audio data for linguistic correctness, clarity, and alignment with guidelines. • Validated and rated speech samples for annotation quality and consistency. • Provided feedback to improve speech-to-text and pronunciation models. • Ensured dataset accuracy for downstream AI/ML applications.

Not specified

Education

O

O2 Academy Lagos - School of Advertising

Diploma in Advertising, Advertising

Diploma in Advertising
2018 - 2018
M

Michael Okpara University of Agriculture

Bachelor of Science, Computer Science

Bachelor of Science
2015 - 2015

Work History

M

Meta Chrone Inc

Remote Digital Operations Assistant

Lagos
2021 - Present