Open to opportunities

David Bassey

@mrpurpose

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Data annotation and quality specialist driving accurate AI training data.

Nigeria

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What I'm looking for

I seek roles where I can improve AI training data quality, lead annotation projects, apply SQL/Python/NLP skills, and work with collaborative, process-focused teams that value documentation and continuous improvement.

I am a detail-oriented Data Annotation and Quality Specialist with five years' experience preparing and validating datasets for AI and ML systems.

I hold an MSc in Data Science and Analysis and have led annotation projects from dataset creation through annotation, QA, and delivery, driving improvements in model training data quality.

At Google and Cohere I applied SQL, Python, NLP techniques, and annotation tooling to label, clean, and transform large datasets, build metrics, investigate root causes of data issues, and recommend process optimizations.

I communicate complex concepts clearly, work effectively in remote settings, and combine hands-on technical skills (MATLAB, Python, SQL, AWS) with strong documentation, QA, and project leadership to ensure high-quality AI training data.

Experience

Work history, roles, and key accomplishments

Data Quality Analyst

Google

Jan 2024 - Nov 2024 (10 months)

Analyzed and cleaned large datasets using SQL to improve ML training data quality; developed metrics, investigated root causes of data issues, and recommended process changes to reduce defects.

SQL Data Cleaning Data Quality Root Cause Analysis Metrics Annotation Auditing QA Python

Data Annotator

Cohere

Dec 2020 - Jan 2024 (3 years 1 month)

Created and labeled high-quality NLP datasets, performed preprocessing and model evaluation for sentiment-analysis pipelines, and deployed APIs and dashboards for real-time insights.

Python NLP Data Annotation SQL Model Evaluation data preprocessing

Online Data Analyst

Peroptyx

Apr 2018 - Nov 2020 (2 years 7 months)

Analyzed search query trends and developed SEO strategies that increased organic search performance; monitored competitors and applied Google algorithm insights to improve website traffic.

SEO Algorithms Competitive Analysis Web Analytics Data Reporting Strategy Development

Online Data Analyst

RaterX

Jul 2017 - Dec 2018 (1 year 5 months)

Labeled, cleaned, and verified datasets for ML use; tracked annotation progress, identified anomalies, and augmented datasets to maintain high data integrity for AI systems.

Data Annotation Data Cleaning QA Anomaly Detection