Chimaroke Opara

I am a detail-oriented Data Labeling and AI Annotation Specialist with extensive experience supporting machine learning and artificial intelligence initiatives through high-quality data annotation, categorization, and quality assurance. Skilled in image, text, audio, and video labeling with strong adherence to annotation guidelines and accuracy standards. Proven ability to work independently in remote environments while meeting strict productivity and quality benchmarks.

Data Annotation Specialist - Appen - Remote

(2025-01 - 2026-12)

• Annotated large datasets including text, images, audio, and video to support AI and machine learning model development.
• Performed detailed labeling tasks such as entity recognition, sentiment classification, intent tagging, and semantic segmentation.
• Applied bounding boxes, polygons, and pixel-level segmentation for computer vision datasets.
• Reviewed and validated peer annotations to ensure quality control and consistency with project guidelines.
• Achieved and maintained 98%+ annotation accuracy across multiple AI training projects.
• Collaborated with AI engineers and project managers to clarify labeling standards and improve dataset reliability.

AI Training & Data Labeling Associate - Ellasot - Remote

(2024-01 - 2025-12)

• Contributed to training datasets for NLP and speech recognition models.
• Labeled conversational data to improve chatbot and virtual assistant performance.
• Conducted audio transcription and intent tagging for multilingual datasets (German–English).
• Identified inconsistencies in training data and provided corrective feedback to enhance model performance.
• Consistently exceeded daily annotation quotas while maintaining high-quality standards.

Position not specified - Secondary Education Management Board, Imo State (SEMB) - Imo State

(2017-01)

Position not specified - Academic Research Consultancy

(2009-01)

Industrial Trainee - Standards Organization of Nigeria (SON) - Nigeria

(2006-01 - 2006-12)

MSc - Biostatistics - Rivers State University (2022-12)

MSc - Environmental Microbiology - Rivers State University, Rivers (2019-01 - 2020-12)

BSc - Microbiology - Nnamdi Azikiwe University, Awka, Anambra State (2004-01 - 2008-12)

WASSCE - National College Gbagada, Lagos (1994-01 - 1999-12)

FSLC - Twinkle-Star Day, Nur/Pry Sch., Lagos (1989-01 - 1994-12)