Stephen Mcdonald

Key Skills

Software

CVAT

AWS SageMaker

Scale AI

Top Subject Matter

No subject matter listed

Top Data Types

Text

Image

Top Label Types

Classification

Bounding Box

Freelancer Overview

I am an experienced AI Data Annotation Specialist with over 9 years dedicated to supporting machine learning and artificial intelligence projects through precise data labeling, annotation, and quality assurance. My background includes working with major technology companies, where I have led annotation teams, trained junior specialists, and collaborated closely with AI engineers on projects spanning natural language processing and computer vision. I am highly skilled in image and text annotation, dataset validation, and workflow optimization, and I am proficient with a range of annotation platforms, data entry systems, and productivity tools such as Microsoft Excel and Google Workspace. My strong attention to detail, commitment to accuracy, and ability to adapt to both remote and office environments ensure the delivery of high-quality, reliable AI training data.

Labeling Experience

Senior AI Data Annotation Specialist

CVATTextClassification

As a Senior AI Data Annotation Specialist at Microsoft, I led annotation and validation of various AI training datasets. I was responsible for ensuring data accuracy through rigorous quality assurance and error correction practices. I worked closely with engineers and trained junior annotation specialists to maintain high annotation standards. • Managed large-scale text and image annotation projects • Ensured quality and compliance with annotation guidelines • Optimized workflows to improve data labeling efficiency • Oversaw onboarding and development of junior staff

As a Senior AI Data Annotation Specialist at Microsoft, I led annotation and validation of various AI training datasets. I was responsible for ensuring data accuracy through rigorous quality assurance and error correction practices. I worked closely with engineers and trained junior annotation specialists to maintain high annotation standards. • Managed large-scale text and image annotation projects • Ensured quality and compliance with annotation guidelines • Optimized workflows to improve data labeling efficiency • Oversaw onboarding and development of junior staff

2022

AI / Machine Learning Data Specialist

Aws SagemakerTextClassification

As an AI / Machine Learning Data Specialist at Amazon Web Services, I annotated large datasets to train various machine learning models. My role involved data validation, quality control, and supporting the improvement of AI training data accuracy. I contributed to both NLP and computer vision project pipelines. • Conducted data labeling for NLP and computer vision tasks • Validated and verified labeled outputs for accuracy • Identified opportunities for increasing annotation accuracy • Supported AI model training through comprehensive data preparation

As an AI / Machine Learning Data Specialist at Amazon Web Services, I annotated large datasets to train various machine learning models. My role involved data validation, quality control, and supporting the improvement of AI training data accuracy. I contributed to both NLP and computer vision project pipelines. • Conducted data labeling for NLP and computer vision tasks • Validated and verified labeled outputs for accuracy • Identified opportunities for increasing annotation accuracy • Supported AI model training through comprehensive data preparation

2019 - 2022

Data Annotation Associate

Scale AIImageBounding Box

As a Data Annotation Associate at Scale AI, I performed image and text annotation work for various client projects. Responsibilities included image tagging, classification, and ensuring high accuracy levels across datasets. I also assisted in ongoing improvements to annotation quality. • Labeled and tagged image datasets using bounding box tools • Contributed to maintaining dataset quality and accuracy • Supported team efforts on quality assurance initiatives • Enhanced annotation procedures for scalability

As a Data Annotation Associate at Scale AI, I performed image and text annotation work for various client projects. Responsibilities included image tagging, classification, and ensuring high accuracy levels across datasets. I also assisted in ongoing improvements to annotation quality. • Labeled and tagged image datasets using bounding box tools • Contributed to maintaining dataset quality and accuracy • Supported team efforts on quality assurance initiatives • Enhanced annotation procedures for scalability

2016 - 2019

Education

Work History