Nathan Barczewski

Key Skills

Software

Mercor

Data Annotation Tech

Top Subject Matter

Large Language Model Dataset Development

LLM Dataset Evaluation and Factuality Checking

Legal Services & Contract Review

Top Data Types

Image

Text

Document

Top Task Types

Object Detection

Freelancer Overview

AI Data Specialist (Contract) at Mercor. Brings 25+ years of professional experience across legal operations, contract review, compliance, and structured analysis. Core strengths include Mercor and Data Annotation Tech. Education includes Master of Arts, Saint Louis University (2009) and Bachelor of Arts, Saint Louis University (2001). AI-training focus includes data types such as Image and Text and labeling workflows including Object Detection, Evaluation, and Rating.

Labeling Experience

AI Data Specialist (Contract) at DataAnnotation.Tech

Data Annotation TechText

I executed factuality tasks that involved verifying and evaluating AI-generated text outputs for LLM dataset development. This work required critical analysis and accuracy in assessment to improve the quality of large language models. My contributions directly impacted the reliability of future AI-generated content. • Assessed factuality and correctness of AI model outputs. • Improved dataset quality through rating and validation tasks. • Supported iterative development cycles for robust language models. • Ensured consistency and adherence to guidelines in evaluation processes.

I executed factuality tasks that involved verifying and evaluating AI-generated text outputs for LLM dataset development. This work required critical analysis and accuracy in assessment to improve the quality of large language models. My contributions directly impacted the reliability of future AI-generated content. • Assessed factuality and correctness of AI model outputs. • Improved dataset quality through rating and validation tasks. • Supported iterative development cycles for robust language models. • Ensured consistency and adherence to guidelines in evaluation processes.

2025 - Present

AI Data Specialist (Contract) at Mercor

MercorImageObject Detection

I performed image annotation, copywriting, and quality review for LLM dataset development projects. My role included serving as a reviewer to ensure the accuracy and consistency of datasets for AI model research. I contributed to the enhancement of data quality through detailed annotation and comprehensive feedback processes. • Executed detailed image annotation tasks for training data. • Reviewed and provided feedback on contributions from other annotators. • Participated in quality assurance activities for Object Detection datasets. • Supported large-scale AI model development for LLM applications.

I performed image annotation, copywriting, and quality review for LLM dataset development projects. My role included serving as a reviewer to ensure the accuracy and consistency of datasets for AI model research. I contributed to the enhancement of data quality through detailed annotation and comprehensive feedback processes. • Executed detailed image annotation tasks for training data. • Reviewed and provided feedback on contributions from other annotators. • Participated in quality assurance activities for Object Detection datasets. • Supported large-scale AI model development for LLM applications.

2025 - Present

Education

Work History