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J
Joseph A.

Joseph A.

Senior RLHF & Large Language Model Training Specialist

Nigeria flagibadan, Nigeria

Key Skills

Software

TolokaToloka
ClickworkerClickworker
DataloopDataloop
ProdigyProdigy
MindriftMindrift
Scale AIScale AI
Anno-MageAnno-Mage
SuperAnnotateSuperAnnotate
AppenAppen
LabelboxLabelbox

Top Subject Matter

Generative AI

Top Data Types

TextText
ImageImage
AudioAudio

Top Task Types

RLHFRLHF
TranscriptionTranscription
Text SummarizationText Summarization
Evaluation/RatingEvaluation/Rating
Prompt + Response Writing (SFT)Prompt + Response Writing (SFT)
Question AnsweringQuestion Answering
Fine-tuningFine-tuning
Text GenerationText Generation
Data CollectionData Collection

Freelancer Overview

Data Annotation and AI Training Specialist with 2+ years of experience supporting the development and evaluation of machine learning models across natural language processing (NLP), generative AI, and computer vision projects. Experienced in data labelling, taxonomy development, prompt-response evaluation, dataset validation, and quality assurance workflows. Proficient in applying annotation guidelines, conducting root-cause analysis on labelling discrepancies, and maintaining high-quality training datasets using industry-standard annotation platforms. Contributed to projects involving large-scale datasets exceeding 500,000 text, image, and multimodal records while consistently achieving quality scores above 98% and meeting demanding production targets. Over the course of my work, I progressed from hands-on annotation to quality review and dataset auditing responsibilities, helping improve annotation consistency and reduce error rates across multiple projects. I have supported model training efforts through response ranking, factuality assessment, content safety evaluation, and human feedback collection for large language models. My combination of analytical rigour, strong English-language expertise, and deep familiarity with AI evaluation frameworks enables me to identify nuanced quality issues that are often missed in standard review processes, contributing to more reliable datasets and stronger model performance.

Labeling Experience

Senior RLHF & Large Language Model Training Specialist

TextTextRLHFRLHF

Led large-scale RLHF and AI training initiatives supporting the development of advanced large language models across multiple domains including education, business, technology, science, and creative writing. Evaluated and ranked AI-generated responses based on accuracy, factuality, reasoning quality, instruction adherence, safety, and user usefulness. Annotated and reviewed over 1.2 million text samples, prompts, and model outputs using detailed annotation guidelines and quality assurance frameworks. Conducted pairwise ranking, preference modeling, hallucination detection, factual verification, and response quality assessments to improve model alignment and performance. Collaborated with cross-functional teams to refine annotation taxonomies, improve reviewer consistency, and develop quality control procedures that increased inter-annotator agreement rates to over 97%. Regularly performed dataset audits, root-cause analyses, and error categorization to identify weaknesses in model behavior and improve training data quality. Contributed to multiple model releases by generating high-quality human feedback data used for supervised fine-tuning (SFT), reinforcement learning workflows, and safety evaluations. Maintained an average quality score above 98% while consistently exceeding productivity targets across high-volume annotation projects.

2022 - 2025

Education

U

University of Ibadan, Nigeria

Bachelor of Science (B.Sc.) in Mathematics, Mathematics

Bachelor of Science (B.Sc.) in Mathematics
2022 - 2026

Work History

T

Toloka

RLHF

ibadan
2022 - 2025