Open to opportunities

Joseph Ngahu

@josephngahu

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Dedicated AI Trainer with expertise in data annotation and evaluation.

Kenya

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What I'm looking for

I seek a role that fosters innovation in AI, emphasizes ethical practices, and offers opportunities for professional growth.

I am a dedicated AI Trainer with a strong background in Mathematics and Computer Science. My hands-on experience with platforms like Outlier, Remotask, and Alignerr has equipped me with the skills necessary to train and evaluate AI systems effectively. I specialize in high-quality data annotation, prompt crafting, and response evaluation, focusing on natural language understanding, summarization, sentiment analysis, and fact-checking AI outputs for accuracy and alignment.

Throughout my career, I have contributed to projects aimed at improving large language model performance and safety, with a strong emphasis on ethical AI development. I thrive in remote environments, consistently meeting deadlines while maintaining a meticulous approach to every task. My passion lies in shaping better AI through thoughtful, human-centered training, ensuring that AI systems are not only effective but also aligned with human values.

Experience

Work history, roles, and key accomplishments

Prompt & Completion Evaluator

Alignerr AI

Jan 2024 - Dec 2025 (1 year 11 months)

Evaluated AI-generated outputs for factual accuracy, coherence, tone, and alignment with user intent across various domains. Edited and rated AI prompts and responses, helping refine model alignment with human expectations and ethical standards through analytical reasoning.

Prompt Evaluation Model Performance Improvement

AI Trainer / Language Data Annotator

Outlier AI

Jan 2023 - Dec 2024 (1 year 11 months)

Annotated complex language data for training and evaluating large language models, performing multi-turn dialogue evaluations and summarization checks. Conducted quality control and refinements of model outputs for natural, human-aligned responses, adhering to tight deadlines while maintaining high accuracy.

Natural Language Understanding Dialogue Evaluation Summarization Quality Control Evaluating Responses

AI Data Specialist

Remotask

Jan 2022 - Dec 2023 (1 year 11 months)

Completed detailed data labeling for computer vision tasks including image segmentation and 3D point cloud annotation. Participated in NLP tasks such as text classification, sentiment analysis, and entity extraction, collaborating with QA teams to ensure consistency and accuracy.

Data Labeling Computer Vision Segmentation 3D Annotation NLP Quality Assurance

Education

Degrees, certifications, and relevant coursework

Jomo Kenyatta University of Agriculture and Technology

Bachelor’s Degree, Mathematics and Computer Science

Pursuing a Bachelor’s Degree in Mathematics and Computer Science, focusing on foundational principles and advanced applications. Developing strong analytical and computational skills relevant to AI and data science.

Githumu Boys High School

Kenya Certificate of Secondary Education, Secondary Education

Completed secondary education, earning the Kenya Certificate of Secondary Education (KCSE). Acquired a broad academic foundation in preparation for higher education.