For employers

Hire this AI Trainer

Sign in or create an account to invite AI Trainers to your job.

Invite to Job
Brian Mumbi

Brian Mumbi

AI Quality Assurance Specialist - Advanced Mathematics

KENYA flag
gatundu, Kenya
$250.00/hrExpertData Annotation Tech

Key Skills

Software

Data Annotation TechData Annotation Tech

Top Subject Matter

No subject matter listed

Top Data Types

VideoVideo

Top Label Types

Segmentation

Freelancer Overview

I have over seven years of experience specializing in data labeling, annotation, and AI training data for advanced machine learning systems. My background includes hands-on work with image segmentation, text classification, sentiment analysis, and search relevance rating for high-profile projects in search technology, social media, and autonomous systems. I am highly skilled in prompt engineering, LLM evaluation, and rigorous QA processes, having developed standardized evaluation rubrics and instructional content that directly improved AI model performance and reduced errors. Proficient with Python (Pandas, NumPy), OpenAI API, Google Gemini, SQL, and Jupyter, I thrive in remote, agile teams and bring a strong focus on accuracy, scalability, and analytical problem-solving to every project. My experience spans both computer vision and NLP domains, and I am committed to delivering high-quality, consistent training data for cutting-edge AI applications.

ExpertEnglish

Labeling Experience

Data Annotation Tech

video annotation

Data Annotation TechVideoSegmentation
as a reviewer i was responsible for reviewing text annotations segment by segment correcting labels

as a reviewer i was responsible for reviewing text annotations segment by segment correcting labels

2025

Education

U

University of California, Berkeley

Bachelor of Science, Mathematics and Computer Science

Bachelor of Science
2020 - 2024

Work History

P

Peachtree Transcripts

General Transcriptionist

Remote
2023 - Present