Spencer Dennis

Key Skills

Software

Toloka

Other

SuperAnnotate

Top Subject Matter

General AI/ML (images, business, e-commerce)

General AI/ML (news, social media)

Healthcare and E-commerce

Top Data Types

Image

Text

Document

Video

Audio

Top Task Types

Classification

Entity (NER) Classification

Transcription

Freelancer Overview

Freelance Data Labeling Specialist – Toloka. Brings 8+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Toloka, Amazon Mechanical Turk, and Other. Education includes Bachelor of Science, University of California, Berkeley (2019). AI-training focus includes data types such as Image, Text, and Video and labeling workflows including Classification, Entity (NER) Classification, and Transcription.

Labeling Experience

Freelance Data Labeling Specialist – Toloka

TolokaVideoClassification

As part of AI-driven video labeling projects, I annotated and categorized video data. I ensured adherence to quality standards and timely completion of tasks. My input contributed to training machine learning models in multiple domains. • Labeled video clips for classification and action recognition • Followed detailed guidelines to standardize video annotations • Tracked progress and results in the Toloka platform • Worked both independently and in collaboration with remote teams

As part of AI-driven video labeling projects, I annotated and categorized video data. I ensured adherence to quality standards and timely completion of tasks. My input contributed to training machine learning models in multiple domains. • Labeled video clips for classification and action recognition • Followed detailed guidelines to standardize video annotations • Tracked progress and results in the Toloka platform • Worked both independently and in collaboration with remote teams

2021 - Present

Freelance Data Labeling Specialist – Toloka

TolokaTextEntity Ner Classification

In this role, I performed text sentiment analysis and entity extraction for AI and ML projects. Tasks involved labeling text data for classification and information extraction tasks. Ongoing collaboration ensured high labeling consistency and project deadline compliance. • Conducted sentiment analysis and NER labeling on various text datasets • Used Toloka to complete and track text annotation tasks • Collaborated with team members for quality assurance • Consistently met accuracy and productivity targets

In this role, I performed text sentiment analysis and entity extraction for AI and ML projects. Tasks involved labeling text data for classification and information extraction tasks. Ongoing collaboration ensured high labeling consistency and project deadline compliance. • Conducted sentiment analysis and NER labeling on various text datasets • Used Toloka to complete and track text annotation tasks • Collaborated with team members for quality assurance • Consistently met accuracy and productivity targets

2021 - Present

Freelance Data Labeling Specialist – Toloka

TolokaImageClassification

As a Freelance Data Labeling Specialist at Toloka, I annotated images for machine learning and AI projects. My responsibilities included meeting high accuracy targets and using the Toloka platform to manage workflow. I collaborated with teams to verify and improve data labeling quality. • Labeled and annotated large image datasets for classification tasks • Maintained accuracy rates over 95% for image classification • Used Toloka for workflow management and task tracking • Provided feedback on labeling consistency and improvements

As a Freelance Data Labeling Specialist at Toloka, I annotated images for machine learning and AI projects. My responsibilities included meeting high accuracy targets and using the Toloka platform to manage workflow. I collaborated with teams to verify and improve data labeling quality. • Labeled and annotated large image datasets for classification tasks • Maintained accuracy rates over 95% for image classification • Used Toloka for workflow management and task tracking • Provided feedback on labeling consistency and improvements

2021 - Present

Data Annotation Specialist – Amazon Mechanical Turk

AudioTranscription

I supported audio transcription projects as a Data Annotation Specialist on Mechanical Turk. Work included listening to audio files and providing accurate transcripts for AI model training. Accuracy and adherence to guidelines were a primary focus throughout the contract. • Transcribed audio files for use in speech recognition tasks • Maintained transcription quality and time deadlines • Followed detailed project instructions for consistent results • Participated in diverse audio labeling domains

I supported audio transcription projects as a Data Annotation Specialist on Mechanical Turk. Work included listening to audio files and providing accurate transcripts for AI model training. Accuracy and adherence to guidelines were a primary focus throughout the contract. • Transcribed audio files for use in speech recognition tasks • Maintained transcription quality and time deadlines • Followed detailed project instructions for consistent results • Participated in diverse audio labeling domains

2020 - 2020

Data Annotation Specialist – Amazon Mechanical Turk

TextClassification

During my time at Amazon Mechanical Turk, I completed text classification and categorization tasks. These included tagging news articles and social media content based on themes and keywords. My labels helped improve natural language processing for machine learning algorithms. • Performed text categorization and sentiment labeling • Worked according to precise thematic categorization instructions • Labeled batches of social media and news texts for training • Delivered consistent, high-quality input to AI workflows

During my time at Amazon Mechanical Turk, I completed text classification and categorization tasks. These included tagging news articles and social media content based on themes and keywords. My labels helped improve natural language processing for machine learning algorithms. • Performed text categorization and sentiment labeling • Worked according to precise thematic categorization instructions • Labeled batches of social media and news texts for training • Delivered consistent, high-quality input to AI workflows

2020 - 2020

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Education

Work History