Kateryna Karpenko

AI-focused specialist with experience in multimodal data annotation and labeling for AI/ML training, including text, image, video, and 3D data. Experienced in sports data annotation (football, hockey, and tennis), data classification, validation, quality control, and LLM output evaluation. Also experienced in training new annotators in English, explaining annotation guidelines, and maintaining data quality and consistency.

Worked with Ukrainian and English datasets, annotation workflows, and AI-driven content systems.

Data Annotation Trainer | AI Data Specialist - Contract work (2026-03) - Multimodal Data Annotation &

• Labeling: Image and video annotation, object detection, bounding box annotation, polygon annotation, image segmentation, keypoint annotation, and 3D object segmentation.

- Sports Data Annotation: Football, hockey, and tennis match annotation, including event tagging, player and ball tracking, action classification, and event sequence labeling.

- Text Annotation &

• LLM Evaluation: Text classification, data categorization, structured labeling, and review of AI-generated content and LLM outputs.

- Data Quality Assurance &

• Validation: Annotation review, data validation, guideline compliance, error detection, edge case identification, and consistency checks.

- Language Data Tasks: English image and video descriptions, translation quality evaluation, meaning verification, and correction of translation errors.

- Annotator Training &

• Guidance: Training new annotators in English, explaining annotation guidelines, demonstrating workflows, and supporting consistent annotation quality.

- Annotation Tools: Label Studio, Labelbox, CVAT, Sportlogiq, Outforz, and custom-built annotation tools.

Project Manager, Game designer– freelancer

October 2007 – present

Engineer's degree in Automatic Control Technologies and Computer Integrated Systems – Prydniprovs'ka State Academy of Civil Engineering and Architecture (2001 – 2006)