Ikechukwu ThankGod Ezenwa

Ikechukwu ThankGod Ezenwa

AI Trainer
Nigeria
German, Hausa, Igbo, Yoruba, Spanish, French, English

About Me

Multilingual AI Data Annotation Lead with 12+ years of experience driving large-scale NLP dataset development, AI model evaluation, and multilingual quality assurance across English, Spanish, French, Igbo, Yoruba, and Ha…

Experience

Senior AI Training & Data Annotation Specialist

Toloka — Remote
Jan 2022 - Present · 4 years 9 months

<p>Lead multilingual annotation projects for NLP and LLM training across 5+ languages.<br>
Conduct QA audits maintaining 98–99% guideline compliance across evaluation cycles.<br>
Designed structured grading rubrics for LLM response evaluation, improving inter-rater consistency.<br>
Automated validation and data-checking processes using Python, increasing annotation throughput by 30%.<br>
Mentored junior annotators on multilingual cultural nuance and labeling standards.<br>
Contributed to RLHF workflows supporting model alignment and bias detection initiatives.</p>

Senior AI Training & Data Annotation Specialist

Toloka
Jan 2022 - Present · 4 years 9 months

Lead multilingual annotation projects for NLP and LLM training across 5+ languages., Conduct QA audits maintaining 98–99% guideline compliance across evaluation cycles., Designed structured grading rubrics for LLM response evaluation, improving inter-rater consistency., Automated validation and data-checking processes using Python, increasing annotation throughput by 30%., Mentored junior annotators on multilingual cultural nuance and labeling standards., Contributed to RLHF workflows supporting model alignment and bias detection initiatives.

AI Model Evaluation & Data Rater

Scale AI — Remote (Contract)
Jan 2017 - Jan 2020 · 3 years

<p>Evaluated AI-generated responses for linguistic accuracy, coherence, and cultural appropriateness.<br>
Annotated large-scale NLP and computer vision datasets.<br>
Applied structured labeling frameworks to improve model training quality metrics.<br>
Identified bias patterns in multilingual datasets and escalated quality concerns to review teams.</p>

AI Model Evaluation & Data Rater

Scale AI
Jan 2017 - Jan 2020 · 3 years

Evaluated AI-generated responses for linguistic accuracy, coherence, and cultural appropriateness., Annotated large-scale NLP and computer vision datasets., Applied structured labeling frameworks to improve model training quality metrics., Identified bias patterns in multilingual datasets and escalated quality concerns to review teams.

Backend Automation Developer

Andela — Nigeria / Remote
Jan 2015 - Jan 2017 · 2 years

<p>Built REST APIs using Python (Flask) to support data-driven applications.<br>
Designed scalable database schemas (PostgreSQL, MySQL).<br>
Developed automation scripts for system monitoring and data ingestion pipelines.</p>

Backend Automation Developer

Andela
Jan 2015 - Jan 2017 · 2 years

Built REST APIs using Python (Flask) to support data-driven applications., Designed scalable database schemas (PostgreSQL, MySQL)., Developed automation scripts for system monitoring and data ingestion pipelines.

Multilingual Language Translator & Dataset Specialist

TransPerfect — Remote (Contract)
Jan 2013 - Jan 2015 · 2 years

<p>Delivered professional translation and localization services across English, Spanish, French, Igbo, and Yoruba.<br>
Validated multilingual training datasets for linguistic consistency and contextual accuracy.<br>
Supported NLP dataset preparation for cross-border AI language models.</p>

Multilingual Language Translator & Dataset Specialist

TransPerfect
Jan 2013 - Jan 2015 · 2 years

Delivered professional translation and localization services across English, Spanish, French, Igbo, and Yoruba., Validated multilingual training datasets for linguistic consistency and contextual accuracy., Supported NLP dataset preparation for cross-border AI language models.

Junior Data Annotation Specialist

Appen — Remote
Jan 2012 - Jan 2013 · 1 year

<p>Performed structured annotation for search engine and speech recognition datasets.<br>
Maintained high task accuracy benchmarks while meeting productivity targets.</p>

Junior Data Annotation Specialist

Appen
Jan 2012 - Jan 2013 · 1 year

Performed structured annotation for search engine and speech recognition datasets., Maintained high task accuracy benchmarks while meeting productivity targets.

Freelance Multilingual AI & Data Annotation Lead

Self-Employed — Remote
Jan 2018

<p>Delivered multilingual dataset solutions for AI startups and research labs.<br>
Built structured datasets (JSON/CSV/XML) for NLP model training across low-resource African languages.<br>
Integrated scraped and annotated datasets into cloud databases and API-based systems.<br>
Improved dataset cleaning turnaround time by 40% via automation scripting.<br>
Provided translation validation and cultural localization QA for AI models targeting African markets.<br>
Optimized web scraping performance using asynchronous programming and headless browser automation.</p>

Freelance Multilingual AI & Data Annotation Lead

Self-Employed
Jan 2018

Delivered multilingual dataset solutions for AI startups and research labs., Built structured datasets (JSON/CSV/XML) for NLP model training across low-resource African languages., Integrated scraped and annotated datasets into cloud databases and API-based systems., Improved dataset cleaning turnaround time by 40% via automation scripting., Provided translation validation and cultural localization QA for AI models targeting African markets., Optimized web scraping performance using asynchronous programming and headless browser automation.

Certifications

Bachelor of science

Univ3ersity of Nigeria, Nsukka · Enugu, Nigeria · 2022

Skills

Multilingual Translation & Localization QA AI Data Annotation Leadership LLM Evaluation & RLHF Annotation Guideline Development Bias Detection & Cultural Review Multilingual NLP Dataset Preparation QA Auditing & Quality Metrics Optimization Python Automation for Annotation Workflows Web Data Extraction & Structuring Programming: Python SQL Bash AI & Annotation Platforms: Toloka Scale AI Appen Label Studio Web Scraping: Apify Scrapy Selenium Playwright OpenRouter Data & ML: Pandas NumPy Scikit-learn Databases: PostgreSQL MySQL Workflow Tools: Git GitHub Docker Jira Notion Slack Multilingual Translation Localization QA AI Data Annotation LLM Evaluation RLHF Bias Detection Cultural Review NLP Dataset Preparation QA Auditing Quality Metrics Optimization Python Web Data Extraction Automation JSON CSV XML Cloud Databases API Integration Asynchronous Programming Headless Browser Automation REST APIs Flask PostgreSQL MySQL System Monitoring Data Ingestion Pipelines Search Engine Annotation Speech Recognition Annotation SQL Bash Toloka Scale AI Appen Label Studio Apify Scrapy Selenium Playwright OpenRouter Pandas NumPy Scikit-learn Git GitHub Docker Jira Notion Slack
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