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N
Nonjabulo S.

Nonjabulo S.

English Native AI Trainer

South Africa flagSandton, South Africa

Key Skills

Software

AppenAppen
ClickworkerClickworker
Label StudioLabel Studio
Micro1
MercorMercor
LionbridgeLionbridge
MindriftMindrift
RemotasksRemotasks
SuperAnnotateSuperAnnotate
TelusTelus
TolokaToloka

Top Subject Matter

AI content review for document recognition and categorization
Document classification and dataset labeling
Legal Services & Contract Review

Top Data Types

DocumentDocument
TextText
AudioAudio

Top Task Types

ClassificationClassification
TranscriptionTranscription
Data CollectionData Collection
Prompt + Response Writing (SFT)Prompt + Response Writing (SFT)
Evaluation/RatingEvaluation/Rating
Question AnsweringQuestion Answering
Text SummarizationText Summarization
Text GenerationText Generation
RLHFRLHF
Object DetectionObject Detection

Freelancer Overview

English Native AI Trainer. Brings 5+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include N and A. Education includes Work Readiness Certificate, Afrika Tikkun (2023) and Public Management and Governance Certificate, University of South Africa (2023). AI-training focus includes data types such as Document and labeling workflows including Evaluation, Rating, and Classification.

Labeling Experience

English Native AI Trainer

DocumentDocument

You reviewed AI-generated document-related content for accuracy, clarity, and policy compliance to support model improvement. • Checked outputs against expected behavior and compliance requirements. • Provided structured human feedback to guide refinements. • Created prompts and evaluated AI outputs used in training datasets. • Reviewed structured data to ensure consistency with labeling guidelines.

2024 - Present

Data Entry Keyer

DocumentDocumentData CollectionData Collection

I was responsible for entering, reviewing and organizing data quickly while making sure that everything was accurate and consistent

2025 - 2026

AI Data Annotator

DocumentDocumentClassificationClassification

You annotated and labeled datasets for machine learning and AI model training, focusing on document categorization. • Categorized documents and text data using structured taxonomy systems. • Conducted quality control by reviewing annotations for dataset accuracy. • Supported document classification and information extraction workflows. • Verified consistency of labeled outputs before dataset use.

2023 - 2024

Education

U

University of South Africa

Public Management and Governance Certificate, Public Management and Governance

Public Management and Governance Certificate
2023 - 2023
A

Afrika Tikkun

Work Readiness Certificate, Work Readiness

Work Readiness Certificate
2023 - 2023

Work History

N

N/A

Administrative Assistant

Sandton
2020 - 2023
N

N/A

Human Resource Volunteer

Sandton
2019 - 2020