Open to opportunities

Chima Ezigbo

@chimaezigbo

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Senior AI Trainer and Data Operations specialist building accurate, compliant healthcare datasets.

Nigeria

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What I'm looking for

I’m looking for a role where I can lead AI training and data operations—delivering high-fidelity annotation, strong QA with RLHF-style review, and automation support—while working with clear standards in healthcare or data-heavy environments.

I’m a multidisciplinary, Micro1-certified Senior IT Operations and Data Specialist who drives technical excellence across high-volume data validation and AI-driven workflow automation. I specialize in advanced data annotation—text, video, and computer vision—using Mindrift (Toloka.ai) and CVAT, with a strong focus on Medical Data Annotation where I apply zero-tolerance for misclassification and strict domain accuracy.

In my recent roles, I also improve model quality through RLHF-style review and response rewriting—flagging context anomalies, biases, and hallucinations to strengthen coherence and narrative consistency. I’ve supported international stakeholders with BI engineering and secure data operations, including building executive dashboards with Power BI and Sisense (cutting decision-making time by 35%) and automating reporting to reduce manual work by 50%.

Experience

Work history, roles, and key accomplishments

Current

AI Trainer & Senior DataAnnotator

Current

Mindrift (Toloka.ai) / ChromaLabelCV

Jan 2026 - Present (6 months)

Performed high-fidelity text and video annotation for LLM comprehension, classification, and generative video accuracy. Specialized in medical data annotation and used CVAT for computer-vision labeling with RLHF-based QA and safety alignment.

Text Annotation Video Annotation Data Annotation Image Annotation Bounding Boxes Quality Assurance Prompt Evaluation Notion Google Sheets

Executive Assistant & Data Specialist

Upwork

Jan 2023 - May 2026 (3 years 4 months)

Delivered AI prompt engineering and operations support to automate technical/content workflows and improve team output while maintaining data consistency. Conducted high-volume data validation and cleaning, handled translation/localization workflows, and optimized inbox/workflow triage to meet response time targets.

Prompt Engineering Data Validation Data Scrubbing Data Cleaning Translation Localization Workflow Optimization

Business Support Manager / Data Analyst

Xavier Energy Limited

Oct 2017 - Dec 2022 (5 years 2 months)

Built and maintained executive-level dashboards using Power BI and Sisense to improve visibility of operational data and speed strategic decision-making. Automated reporting with AI-driven workflows and managed secure executive databases and corporate financial trackers with strict regulatory compliance.

Power BI Sisense Dashboard Development Business Intelligence Data Visualization Workflow Automation Database Management Data Integrity

Executive Assistant & Head of Sales

Everest Oil Company Limited (Ascon Oil Group)

Jan 2007 - Jun 2017 (10 years 5 months)

Synthesized complex industrial asset and sales data into stakeholder presentations to improve corporate alignment and engagement. Digitized file routing with high-speed processing systems and supervised logistics, asset maintenance, and procurement workflows to support administrative uptime.

Technical Presentations Data Synthesis Routing Logistics Coordination Maintenance

Senior Data Entry Officer & Assistant

Ascon Oil Company Ltd

Dec 2000 - Jun 2010 (9 years 6 months)

Maintained strict zero-error data integrity while capturing and updating high-volume corporate operational datasets. Performed data deduplication and audited incoming leads by cross-referencing them against company metrics prior to executive review.

Data Integrity Data Cleaning Data Validation Lead Qualification Deduplication