Open to opportunities

Timothy Kiprotich

@timothykiprotich

Message

I build accurate AI training datasets across medical imaging, NLP, speech, and e-commerce.

Kenya

Message

What I'm looking for

I'm looking to contribute high-quality annotation, evaluation, and data-quality work to AI/ML projects, especially across computer vision, NLP, speech, healthcare, and e-commerce.

At Sama AI, I annotate medical images for diagnostic AI models, delivering more than 100,000 labeled images and achieving 95% accuracy in quality audits.

I work with engineers to refine annotation guidelines, reducing errors by 20%, and I’ve trained 15 junior annotators to improve team throughput by 25%.

Previously at CloudFactory Kenya, I labeled text and sentiment data for e-commerce chatbots, processing over 10,000 customer-support transcripts and helping improve model accuracy by 18%.

Through freelance projects for international clients, I deliver structured image and text datasets for AI/ML workflows. My work has earned repeat contracts, a 100% client satisfaction rating, and client model-performance improvements of 15–25%.

Experience

Work history, roles, and key accomplishments

Current

Data Annotation Specialist

Current

Samasource Kenya

Jan 2022 - Present (4 years 8 months)

Annotated 100,000+ medical images for diagnostic AI models, achieving 95% accuracy in quality audits. Collaborated with engineers to refine annotation guidelines, reducing error rates by 20%.

Data Annotation Medical Imaging Quality Assurance Guideline Adherence Team Mentoring

Current

Freelance Data Annotation Specialist

Current

Upwork

Jan 2021 - Present (5 years 8 months)

Completed 20+ projects in image and text annotation for international clients, delivering structured datasets for AI/ML workflows. Achieved 100% client satisfaction rating and repeat contracts through consistent quality and reliable project delivery.

Image Annotation Text Annotation AI Workflows Customer Satisfaction Project Delivery

Data Labeling Associate

CloudFactory Kenya

Jun 2020 - Dec 2021 (1 year 6 months)

Delivered text and sentiment annotation for e-commerce chatbots, supporting NLP model training and improving model accuracy by 18%. Processed 10,000+ customer support transcripts with consistent quality scores above 92%.

Text Annotation Sentiment Analysis NLP Data quality review Classification

Education

Degrees, certifications, and relevant coursework

Maseno University

Bachelor of Science, Mathematics & Computer Science

2021 - 2025

Grade: First Class Honors

Activities and societies: Dean's List (2024, 2025)

Graduated with First Class Honors. Research thesis on optimizing annotation workflows for machine learning in low-resource languages. Dean's List in 2024 and 2025.