Dina Zoheir Esmael

Key Skills

Software

CVAT

Dataloop

Top Subject Matter

No subject matter listed

Top Data Types

Image

Video

Top Label Types

Object Detection

Action Recognition

Freelancer Overview

I am an experienced AI Data Annotation Lead and Research Validation Specialist with over five years supporting machine learning development through meticulous data labeling, annotation, and content verification. My background includes leading large-scale annotation projects involving text, image, and structured data for California-based tech firms, where I have applied multi-layer evaluation rubrics to ensure the factual accuracy and structural compliance of AI-generated outputs. I am skilled in designing and refining taxonomies, conducting fact-checking, and improving dataset reliability—particularly for NLP and structured data projects. I am proficient with tools such as CVAT, Label Studio, Data Loop, SQL, and Excel, and have a strong grasp of quality assurance methodologies and structured documentation. My experience includes mentoring junior annotators, collaborating with data engineers to reduce model errors, and producing validation metrics that drive continuous improvement in data quality. I am passionate about supporting the development of reliable AI systems through rigorous data practices and cross-functional teamwork.

Labeling Experience

data annotation

DataloopImageObject Detection

Categorized and labeled structured datasets for small AI pilot initiatives

Categorized and labeled structured datasets for small AI pilot initiatives

2022 - 2025

data annotation

CVATImageObject Detection

Identify ambiguity patterns in prompt-response datasets, reducing model hallucination rates during early training cycles

Identify ambiguity patterns in prompt-response datasets, reducing model hallucination rates during early training cycles

2022 - 2025

data annotation

CVATVideoObject DetectionAction Recognition

Conducted manual data cleaning to eliminate duplication and formatting inconsistencies

Conducted manual data cleaning to eliminate duplication and formatting inconsistencies

2018 - 2020

Education

Work History