Purity N.

Key Skills

Freelancer Overview

P U R I T Y N J O K I Data Annotation Specialist | AI Training Data Professional [email protected] • Kirinyaga, Kenya PROFESSIONAL SUMMARY Detail-oriented Data Annotation Specialist with 3+ years of experience delivering high-quality labeled datasets for AI and machine learning applications. Proven track record across multiple platforms including data annotation, video annotation, text labeling, and image labeling. Holds a B.Sc. in Software Engineering and demonstrates strong commitment to data quality, accuracy, and adherence to annotation guidelines. CORE SKILLS & COMPETENCIES • Data Annotation — labeling structured and unstructured datasets for ML model training • Video Annotation — frame-by-frame object tracking, activity recognition, and segmentation • Text Labeling — NLP data tagging, sentiment analysis, named entity recognition (NER), intent classification • Image Labeling — bounding boxes, polygon annotation, semantic segmentation, and keypoint marking • Quality assurance and inter-annotator agreement review • Proficient with annotation tools: Label Studio, CVAT, and platform-native tooling WORK EXPERIENCE Senior Data Annotator | Outlier AI January 2024 – Present • Annotate and review large-scale datasets used to train and evaluate generative AI and LLM models. • Perform complex text labeling tasks including RLHF (Reinforcement Learning from Human Feedback) evaluations. • Maintain annotation accuracy rates above 96% across multiple concurrent projects. • Coll