Dennis G.

Key Skills

Software

Scale AI

Appen

Lionbridge

Top Subject Matter

AI model output evaluation

RLHF feedback

safety/helpfulness rating

Top Data Types

Text

Audio

Image

Document

Top Task Types

RLHF

Transcription

Freelancer Overview

Lead AI Evaluator & Data Annotator | Scale AI (Remote). Brings 7+ years of professional experience across legal operations, contract review, compliance, and structured analysis. Core strengths include Scale AI, Appen, and Lionbridge. Education includes Bachelor of Science, Manchester Metropolitan University (2020) and Associate of Applied Science, University of Hertfordshire (2018). AI-training focus includes data types such as Text and Audio and labeling workflows including RLHF, Transcription, and Evaluation.

Labeling Experience

Lead AI Evaluator & Data Annotator | Scale AI (Remote)

Scale AITextRLHF

Conducted RLHF-based evaluation by ranking and rating AI model outputs across safety, accuracy, tone, and helpfulness using structured rubrics. Provided nuanced, reasoned feedback to drive model improvement and maintain high-quality ground truth. Led annotation quality oversight and dispute resolution to reduce disagreement and improve rubric clarity. • Ranked and rated model outputs (safety/helpfulness/accuracy/tone). • Reviewed ground truth submissions and resolved labeling disputes. • Refined annotation guidelines and ontology definitions to reduce inter-annotator disagreement. • Maintained 99.1% accuracy across 200,000+ labeled items for text classification, NER, and document parsing tasks.

2023 - Present

AI Training Data Specialist | Appen (Remote)

AppenAudioTranscription

Performed AI data labeling for speech and media-related training data by transcribing and quality-reviewing English-language audio for speech recognition pipelines. Applied detailed rating guidelines to judge relevance, quality, and policy compliance for web and social media content. Produced geometric annotations required for visual ML dataset preparation. • Transcribed and quality-reviewed 300+ hours of English audio for ASR training.• Evaluated web search results and social media content for relevance/quality/policy compliance.• Completed image segmentation and bounding box/polygon annotations for retail and medical imaging datasets.• Onboarded across 9 distinct annotation project types and maintained top-tier ground truth quality scores.

2021 - 2022

Content Reviewer & Search Quality Rater | Lionbridge AI / Telus International (Remote)

LionbridgeText

Labeled and evaluated search-quality training data by rating query relevance, page quality, and user intent alignment using structured rating frameworks. Conducted content moderation labeling by flagging harmful, misleading, and policy-violating material in social media and e-commerce contexts. Ranked among the top-performing raters consistently, supporting ongoing AI ranking and moderation improvements. • Rated search engine results for relevance, quality, and user intent alignment.• Flagged harmful/misleading/policy-violating content for moderation training data.• Provided consistent high-quality ratings across both Lionbridge and Telus International platforms.• Used structured rating frameworks to inform ML model improvements.

2020 - 2021

Education

Work History