Hassan O.

Key Skills

Software

Data Annotation Tech

Clickworker

OneForma

Top Subject Matter

Machine Learning datasets annotation (general ML)

Top Data Types

Text

Document

Image

Top Task Types

Classification

Bounding Box

Segmentation

Freelancer Overview

I am a detail-oriented Data Labeling Specialist with extensive experience annotating high-quality datasets for computer vision, natural language processing (NLP), and large language models (LLMs). My expertise spans semantic segmentation, bounding boxes, text categorization, and sentiment analysis across various annotation platforms like Labelbox, Scale AI, and CVAT. By consistently maintaining over 98% accuracy, I ensure that machine learning models train on flawless, bias-free ground truth data.What sets me apart is my deep understanding of the AI development lifecycle and my ability to manage complex edge cases efficiently. I have successfully contributed to large-scale projects, including autonomous vehicle training and conversational AI chatbot optimization. Combining rigorous quality control with a strong technical aptitude, I bridge the gap between raw data and high-performing AI deployment.

Labeling Experience

Data Annotator

TextClassification

Performed thorough data annotation across multiple machine learning projects to produce reliable datasets for model training and performance improvements. Built and applied efficient annotation guidelines to reduce average turnaround time while maintaining labeling quality and consistency. Partnered with data scientists to resolve labeling inconsistencies, improving dataset reliability and accuracy for critical AI use cases. • Conducted annotation work to ensure high-quality dataset outputs • Developed guidelines that reduced turnaround time by 30% • Collaborated with data scientists to correct inconsistencies (25% reliability improvement) • Implemented peer-review to decrease annotation errors by 15% and trained new annotators to boost productivity by 20%

Present

Education

Work History