Harry R.

Key Skills

Software

AWS SageMaker

Appen

CloudFactory

Clickworker

Data Annotation Tech

Datumbox

Dataturk

Deep Systems

Diffgram

Doccano

Hasty

HiveMind

Labelbox

LabelImg

Label Studio

LightTag

OneForma

OpenCV AI Kit (OAK)

Prodigy

Redbrick AI

Roboflow

Sama

Top Subject Matter

LLM training

AI safety/content moderation

Rlhf Domain Expertise

Top Data Types

Text

Image

Audio

Document

Top Task Types

RLHF

Polygon

Transcription

Freelancer Overview

Senior AI Data Annotator & Model Trainer. Core strengths include Outlier AI and Remotasks (Scale AI). Education includes Bachelor of Science, University of Nairobi (2021). AI-training focus includes data types such as Text, Image, and Audio and labeling workflows including RLHF, Polygon, and Transcription.

Labeling Experience

Senior AI Data Annotator & Model Trainer

TextRLHF

Delivered RLHF labeling by ranking model outputs and writing ideal responses to support LLM training. Identified harmful or inaccurate generations and applied safety guidelines to ensure compliant preference data. Maintained high accuracy on large-scale annotation workflows across multiple active projects. • Ranked responses using rubrics for helpfulness, factuality, safety, and coherence. • Produced preference and response pairs for instruction-following improvements. • Reviewed sensitive content for toxicity, misinformation, and hate speech. • Sustained 97%+ accuracy and contributed top-10% throughput/quality scores.

2023 - Present

Data Labeling Specialist

AudioTranscription

Transcribed and time-stamped audio for speech recognition (ASR) training data preparation. Produced accurate labeled transcripts across diverse accents and recording environments to improve model robustness. Performed quality checks and reviewed junior annotations to prevent dataset integrity issues. • Transcribed audio and added timestamps for ASR datasets. • Reviewed and quality-checked annotations from junior labelers. • Flagged errors and provided structured feedback. • Supported multilingual/dialect variation through careful transcription.

2021 - 2022

Data Labeling Specialist

ImagePolygon

Performed large-volume annotations for computer vision and medical imaging ML datasets. Completed polygon segmentation and semantic labeling on high-resolution image sets to support radiology and retail object detection use cases. Also produced bounding box, keypoint, and segmentation labels while monitoring consistency and dataset integrity. • Labeled computer vision tasks including bounding boxes, segmentation, and keypoints. • Conducted polygon segmentation for medical imaging AI projects. • Maintained a sustained quality score of 4.8/5.0 over 12 months. • Advanced to Tasker Expert level, enabling higher-complexity labeling assignments.

2021 - 2022

Education

Work History