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Mumbi Ndengu

Mumbi Ndengu

AI Data Annotator / Response Evaluator (Comparable Work)

Kenya flagNairobi, Kenya
$15.00/hrIntermediateAppen

Key Skills

Software

AppenAppen

Top Subject Matter

Customer service
content evaluation
Legal Services & Contract Review

Top Data Types

DocumentDocument
TextText
ImageImage

Top Task Types

SegmentationSegmentation
Object DetectionObject Detection
Text GenerationText Generation
Question AnsweringQuestion Answering
Text SummarizationText Summarization
TranscriptionTranscription
Fine-tuningFine-tuning

Freelancer Overview

I am an experienced, meticulous AI data annotator and response evaluator with more than 20 years of data analysis, review and resolution of large-scale customer inquiries. With a record of 98%+ data integrity and high-quality decision-making in time-sensitive, rule-based settings, I have a strong understanding of workflows and guidelines. I have experience in AI response evaluation, moderation, prompt–response analysis, and text data annotation, backed by a deep understanding of natural language and excellent communication skills. Skilled in customer relationship management and ticketing systems like Zoho Desk, Zendesk and Freshdesk, I am proficient in managing large volumes of data, maintaining clarity, compliance and impartiality in a variety of workflows. I have consistently processed 80-120 daily enquiries, solved more than 90% of problems on the first contact, and achieved SLA targets (95%+ timely response) in my previous roles as a Revenue Officer at Kenya Revenue Authority. my experience parallels that of AI training, where I have been involved in the classification, ranking and verification of information to ensure quality. I have also helped streamline processes, reducing turnaround time by 20%, and generated quality documentation for knowledge base and training purposes. My experience in analytical assessment, transcription and documentation of structured information positions me as a dependable and flexible team player who can hit the ground running in AI training, annotation and evaluation tasks.

IntermediateEnglishSwahili

Labeling Experience

AI Data Annotator / Response Evaluator (Comparable Work)

Text
Oversaw the evaluation of written inquiries and documentation to ensure data accuracy and guideline adherence. Assessed and validated customer communication in alignment with structured workflows similar to AI data annotation pipelines. Maintained a high standard of data quality suitable for knowledge base and training reference material. • Reviewed and categorized high-volume written data for clarity and compliance. • Followed structured processes to analyze and resolve customer issues efficiently. • Maintained consistent documentation with a verified accuracy rate exceeding 98%. • Supported AI-driven workflows by ensuring reliable and unbiased content evaluations.

Oversaw the evaluation of written inquiries and documentation to ensure data accuracy and guideline adherence. Assessed and validated customer communication in alignment with structured workflows similar to AI data annotation pipelines. Maintained a high standard of data quality suitable for knowledge base and training reference material. • Reviewed and categorized high-volume written data for clarity and compliance. • Followed structured processes to analyze and resolve customer issues efficiently. • Maintained consistent documentation with a verified accuracy rate exceeding 98%. • Supported AI-driven workflows by ensuring reliable and unbiased content evaluations.

2006 - 2025

Education

J

Jomo Kenyatta University of Agriculture and Technology / Kenya School of Revenue Administration

Postgraduate Diploma, Customs Administration

Postgraduate Diploma
2025 - 2025
M

Mount Kenya University

Bachelor of Development Studies, Development Studies

Bachelor of Development Studies
2022 - 2022

Work History

K

Kenya Revenue Authority

Revenue Officer

Nairobi
2006 - Present
B

BIVAC International

Senior Administrative Assistant

Nairobi
2003 - 2005