Open to opportunities

James Mwangi

@jamesmwangi11

Message

I improve AI training data through precise annotation and Python validation.

Kenya

Message

What I'm looking for

I'm looking for opportunities to support machine learning systems through high-quality data annotation, validation, and quality assurance, while applying Python automation, improving dataset reliability, and collaborating with distributed teams.

I've supported AI model training at Toloka AI, Remotasks, and CVAT by annotating and evaluating image, audio, and text datasets. My work includes segmentation, bounding boxes, object classification, text ranking, audio evaluation, and business verification.

At CVAT, I managed data labeling, validation, and quality assurance while collaborating with data teams to refine guidelines and improve dataset accuracy by approximately 20%. I also developed Python validation scripts with Pandas and NumPy that reduced manual data-review workload by 30%.

I'm detail-oriented, adaptable to evolving annotation frameworks, and comfortable working independently with distributed teams. My background in project planning and management also helps me coordinate workflows, documentation, and deliverables effectively.

Experience

Work history, roles, and key accomplishments

Freelance AI Data Annotator

Toloka AI

Mar 2021 - Dec 2023 (2 years 9 months)

Completed large-scale annotation and evaluation tasks across image, audio, and text datasets for AI model training. Rated images, evaluated audio, and performed fact-checking and comparative analysis of text outputs.

Image Annotation Audio Evaluation Text Annotation Data Quality Assurance Fact Checking Online Research Attention To Detail

AI Data Annotation Specialist

CVAT

Dec 2022 - May 2023 (5 months)

Managed full annotation lifecycle including data labeling, validation, and quality assurance. Collaborated with data teams to refine annotation guidelines, improving dataset accuracy by approximately 20%.

Data Labeling Validation Quality Assurance CVAT Labelbox Prodigy Python Pandas NumPy

Freelance Data Annotator

Remotasks

Dec 2021 - Dec 2022 (1 year)

Executed image segmentation tasks, drew bounding boxes, and performed object classification and labeling. Reviewed and ranked text responses based on relevance, factual accuracy, safety, and coherence.

Segmentation Bounding Boxes Accuracy

Intern Project Coordinator

DEEPIN

Assisted in project planning, scheduling, and monitoring of deliverables. Prepared progress reports and coordinated with stakeholders to ensure project alignment with objectives.

Project Planning Scheduling Monitoring Reporting Stakeholder Coordination Trello Microsoft Project

Education

Degrees, certifications, and relevant coursework

Karatina University

Bachelor's Degree, Project Planning and Management

2019 - 2023

Grade: Second Class Honours

Pursued a Bachelor's degree in Project Planning and Management, achieving Second Class Honours. Completed coursework in data analysis, research methods, and strategic planning.