David Nganga

Key Skills

Software

Other

Sama

CloudFactory

Telus

Lionbridge

Label Studio

Top Subject Matter

Large Language Models (LLMs)

AI Safety

Prompt Engineering

Top Data Types

Text

Image

Document

Top Task Types

Classification

Polygon

Transcription

Bounding Box

Freelancer Overview

AI Data Trainer (Contract). Brings 2+ years of professional experience across legal operations, contract review, compliance, and structured analysis. Core strengths include Other, Sama, and CloudFactory. Education includes Certificate in Data Engineering, ALX Africa (2026) and Bachelor of Arts, Laikipia University (2019). AI-training focus includes data types such as Text, Image, and Document and labeling workflows including Evaluation, Rating, and Classification.

Labeling Experience

AI Data Trainer (Contract)

OtherText

As an AI Data Trainer at OpenAI, I evaluated AI-generated responses to enhance model accuracy and relevance. I developed and tested prompts to improve the outputs of large language models. I collaborated with data scientists to set benchmarks and document results. • Evaluated and rated LLM text outputs for quality and safety. • Designed and tested structured prompts for large language model enhancement. • Worked closely with technical teams on model iteration documentation. • Contributed to establishing best practices in evaluation processes.

As an AI Data Trainer at OpenAI, I evaluated AI-generated responses to enhance model accuracy and relevance. I developed and tested prompts to improve the outputs of large language models. I collaborated with data scientists to set benchmarks and document results. • Evaluated and rated LLM text outputs for quality and safety. • Designed and tested structured prompts for large language model enhancement. • Worked closely with technical teams on model iteration documentation. • Contributed to establishing best practices in evaluation processes.

2025 - 2025

Research Associate / Data Specialist

SamaImageClassification

At Sama Kenya, I analyzed multi-modal data including images, audio, and video against rigorous quality standards. My primary responsibility was ensuring accuracy, flagging non-compliant content, and supporting data integrity for clients. I prepared comprehensive reports to support ongoing internal and external processes. • Classified and verified large datasets according to client specifications. • Flagged non-compliant image, audio, and video content for review. • Conducted quality checks following stringent guidelines across data types. • Prepared detailed performance and quality reports for stakeholders.

At Sama Kenya, I analyzed multi-modal data including images, audio, and video against rigorous quality standards. My primary responsibility was ensuring accuracy, flagging non-compliant content, and supporting data integrity for clients. I prepared comprehensive reports to support ongoing internal and external processes. • Classified and verified large datasets according to client specifications. • Flagged non-compliant image, audio, and video content for review. • Conducted quality checks following stringent guidelines across data types. • Prepared detailed performance and quality reports for stakeholders.

2021 - 2025

Data Specialist (Annotator)

CloudfactoryDocumentClassification

As a Data Specialist (Annotator) at CloudFactory, I validated and structured large document datasets for reporting. My role involved translating raw data into actionable insights for clients. I contributed to enhanced data reliability, integrity, and dashboard creation. • Ensured complete consistency and accuracy for all document data. • Created custom dashboards to visualize and interpret labeled results. • Supported team efforts for client-facing data initiatives and deliverables. • Played a role in maintaining high data quality standards across projects.

As a Data Specialist (Annotator) at CloudFactory, I validated and structured large document datasets for reporting. My role involved translating raw data into actionable insights for clients. I contributed to enhanced data reliability, integrity, and dashboard creation. • Ensured complete consistency and accuracy for all document data. • Created custom dashboards to visualize and interpret labeled results. • Supported team efforts for client-facing data initiatives and deliverables. • Played a role in maintaining high data quality standards across projects.

2021 - 2021

Education

Work History