Jafar J.

Key Skills

Software

Toloka

Other

Top Subject Matter

Educational Content Evaluation and AI Training

Top Data Types

Image

Text

Video

Top Task Types

Classification

Bounding Box

Object Detection

Freelancer Overview

AI Content Evaluation/Data Annotation. Brings 13+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include N and A. Education includes Master of Science, Cavendish University and Bachelor of Science, Bayero University Kano. AI-training focus includes data types such as Text and labeling workflows including Evaluation and Rating.

Labeling Experience

Data Annotation Specialist | Toloka Annotators Network

TolokaImageClassification

As a Data Annotation Specialist at Toloka Annotators Network, I worked on annotating and labeling images, text, and audio files for AI model training. I ensured over 99% accuracy through multiple annotation batches and maintained high data quality via peer review and validation processes. I played a critical role in collaborating with international teams and refining annotation guidelines to improve project outcomes. • Annotated and labeled 10,000+ images, text, and audio files for machine learning projects • Conducted peer reviews and validation for quality assurance • Refined annotation processes and guidelines based on real-time feedback • Managed dataset collection and organization to support global AI development

2025 - Present

Data Annotation Specialist | Mind Valley AI

OtherTextClassification

At Mind Valley AI, I labeled sentiment, intent, and classification data for conversational AI models to improve dataset quality and model performance. I was responsible for data cleaning, consistency checks, and validation to ensure high standards in multimodal datasets. My efforts included documenting edge cases and enhancing annotation guidelines for complex scenarios. • Labeled sentiment, intent, and classification data for conversational AI • Performed data cleaning and validation on multimodal datasets • Documented edge cases and improved annotation guidelines • Supported data collection and organization for robust AI training

2023 - Present

Education

Work History