NM

Njabulo Mazibuko

AI Safety Evaluator | Data Annotator | Linguistic QA & Rater | Market Research Specialist

Durban / Johannesburg, South Africa

ABOUT

Innovative and detail-driven AI Safety Evaluator and Multilingual Data Specialist with extensive experience in adversarial red teaming, content moderation, linguistic QA, and structured scoring. Skilled in LLM evaluation, audio annotation, prompt injection testing, and translation quality rating. Proven track record of improving AI model reliability, fairness, and user safety through human-in-the-loop evaluations, consumer persona testing, and multilingual dataset annotation. Experienced in collaborating on frontier AI research projects and optimizing NLP systems across text, audio, and visual datasets. Adept at combining psychological insights with technical rigor to ensure nuanced content alignment and user experience optimization.

SKILLS

Adversarial Prompting & JailbreakingPrompt Injection Detection & Override TestingLLM Safety & Behavior Evaluation (ChatGPT, Claude, etc.)Human-in-the-Loop AI TestingAI Trust & Safety
Linguistic QA & Translation RatingData Annotation & Multimodal Labeling (Text, Audio, Image)Gravity Rubric-Based Scoring & Structured EvaluationMultilingual Voice Tracking & Audio Annotation
Content Moderation & Harm Taxonomy Scoring (Hate Speech, Misinformation, Self-Harm)Policy Compliance Taxonomies
Consumer Persona Testing & Mystery ShoppingSearch Engine & Ad Relevance EvaluationMarket Research & User Behavior Analysis
GPT-based LLMs (ChatGPT, Claude, Bard)AudacityVoicemodAppenTELUSScale AIWordPressGoogle Docs
English (Native)Zulu (Native proficiency)

EXPERIENCE

AI Evaluator & Annotation Specialist

2025-01 - Present

Alignerr • Remote

Performed structured evaluation and multilingual annotation for AI model improvement. • Performed structured evaluation and multilingual annotation for AI model improvement. • Conducted audio voice tracking and quality scoring using structured rubrics. • Delivered annotated data for supervised learning and multilingual model alignment.

Adversarial Prompt Tester & Red Teamer

2024-01 - Present

TELUS International AI • Remote

Designed adversarial prompts and stress tests to uncover LLM vulnerabilities. • Designed adversarial prompts and stress tests to uncover LLM vulnerabilities. • Evaluated prompt injection, system override exploits, and compliance breaches. • Logged jailbreaks with ethical framing and persona-based scenario design.

AI Trust & Safety Evaluator

2023-01 - 2023-12

TELUS International AI • Remote

Evaluated model outputs for safety, bias, misinformation, and ethical violations. • Evaluated model outputs for safety, bias, misinformation, and ethical violations. • Scored responses based on severity using platform-specific taxonomies. • Compiled structured feedback reports with risk flags and mitigation strategies.

Data Annotator & Rater (Freelance)

2023-01 - 2024-12

Outlier • Remote

Rated and annotated translation quality for linguistic datasets. • Rated and annotated translation quality for linguistic datasets. • Categorized errors by severity, fluency, and comprehension standards. • Generated and reviewed queries and answers for annotation-based tasks. • Assessed relevance and effectiveness of search engine results. • Rated digital advertisements for targeting accuracy and user engagement.

Market Research Analyst

2019-01 - 2024-12

Various Clients

Led behavioral research and survey studies across industry verticals. • Led behavioral research and survey studies across industry verticals. • Delivered data-backed insights to optimize brand messaging and user interaction.

Zulu Voice-over & Dubbing Specialist

2024-01 - 2025-12

Freelance

Delivered professional multilingual voiceovers for regional media and AI audio datasets. • Delivered professional multilingual voiceovers for regional media and AI audio datasets. • Contributed to culturally-sensitive dataset creation for voice recognition models.

EDUCATION

TEFL Professional Institute

- 2024-10

Certificate in Teaching English as a Foreign Language