Open to opportunities

Dan nyaga

@duncannyaga

Message

Data scientist and LLM trainer delivering high-quality annotated datasets and model evaluation.

Kenya

Message

What I'm looking for

I seek a full-time role applying LLM evaluation, annotation, and model training skills in collaborative, safety-focused teams with opportunities to improve real-world AI systems.

I am a data scientist and LLM AI trainer with 3+ years of hands-on experience in large language model evaluation, data annotation, and machine learning model training. I focus on improving model safety, accuracy, and reliability for production deployments.

My work includes systematic LLM evaluation, prompt engineering, and red-teaming to identify bias and safety issues, and I collaborate closely with ML engineers to iterate on model improvements. I have developed evaluation frameworks that boosted model reliability scores by 15%.

I have annotated and labeled text, image, and structured datasets at scale, maintained annotation guidelines, and achieved high inter-annotator agreement and accuracy rates (95%+ and 98%+ reported across projects). I also contributed to search relevance improvements and geospatial data validation.

I bring technical proficiency in Python, SQL, Tableau, statistical analysis, and machine learning, plus domain expertise in NLP, search optimization, and supply chain analytics. I am available immediately for full-time roles and seek opportunities to apply rigorous annotation and evaluation practices to real-world AI systems.

Experience

Work history, roles, and key accomplishments

Current

LLM AI Trainer

Current

Centific

Jun 2022 - Present (3 years 8 months)

Evaluated and refined LLM outputs for safety, accuracy, coherence, and relevance, conducted red-teaming to identify bias and unsafe content, and collaborated with engineers to improve production model performance.

Prompt Engineering Data Annotation Quality Assurance Red Team Python NLP Inter Annotator Agreement

Data Analyst

Appen

Jan 2022 - Jan 2024 (2 years)

Performed content moderation, risk assessments, and multilingual adaptation for AI training datasets; collaborated with data science teams to maintain annotation quality and delivered trend analysis and quality metrics.

Content Moderation Data Annotation QA SQL Python Data Analysis Reporting

Supply Chain Analyst

Population Services Kenya

May 2021 - Jan 2022 (8 months)

Maintained and cleaned supply chain datasets, automated inventory and delivery reports using Excel and SAP, and forecasted demand to reduce stockouts by 10% through cross-functional process improvements.