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Kelvin Kafumu

AI Training Data Writer and Content Specialist

Tanzania flagDar es Salaam, Tanzania
IntermediateLabelboxOtherMercor

Key Skills

Software

LabelboxLabelbox
Other
MercorMercor

Top Subject Matter

Business Domain Expertise
Communication Domain Expertise
Technical Writing

Top Data Types

TextText
DocumentDocument
AudioAudio

Top Task Types

Prompt + Response Writing (SFT)Prompt + Response Writing (SFT)
Evaluation/RatingEvaluation/Rating
Object DetectionObject Detection
Text SummarizationText Summarization
Question AnsweringQuestion Answering
ClassificationClassification

Freelancer Overview

AI Training Data Writer and Content Specialist. Brings 7+ years of professional experience across legal operations, contract review, compliance, and structured analysis. Core strengths include Other and Scale AI. AI-training focus includes data types such as Text and labeling workflows including Prompt + Response Writing (SFT).

Intermediate

Labeling Experience

AI Training Data Writer and Content Specialist

OtherTextPrompt Response Writing SFT
In this role, I wrote and evaluated high-quality prompts and human-written responses for AI training data, focusing on business, communication, and technical writing. I produced style guides and quality rubrics to differentiate between polished human writing and generic AI output for annotation purposes. I delivered workshops to improve language structure comprehension and annotation accuracy across the team. • Authored and reviewed over 5,000+ words per month in annotated datasets. • Created rubrics that reduced correction rates by 90%. • Adapted tone and structure for multiple writing formats and tasks. • Provided structured feedback to maintain annotation consistency.

In this role, I wrote and evaluated high-quality prompts and human-written responses for AI training data, focusing on business, communication, and technical writing. I produced style guides and quality rubrics to differentiate between polished human writing and generic AI output for annotation purposes. I delivered workshops to improve language structure comprehension and annotation accuracy across the team. • Authored and reviewed over 5,000+ words per month in annotated datasets. • Created rubrics that reduced correction rates by 90%. • Adapted tone and structure for multiple writing formats and tasks. • Provided structured feedback to maintain annotation consistency.

2024 - Present
Scale AI

Prompt Engineer and Language Evaluator

Scale AITextPrompt Response Writing SFT
This position consisted of prompt engineering, crafting varied prompts, and authoritative human responses for professional and general use cases as part of AI training workflows. I evaluated AI-generated outputs with detailed annotation rubrics, flagging errors in tone, accuracy, and register for repeated quality benchmarking. I developed datasets covering writing edge cases and format diversity to aid large language model evaluation and improvement. • Designed prompts and annotated responses across 10+ writing categories. • Evaluated and annotated data according to strict rubric guidelines. • Benchmarked model quality using diverse evaluation sets. • Identified and documented error patterns for annotation feedback.

This position consisted of prompt engineering, crafting varied prompts, and authoritative human responses for professional and general use cases as part of AI training workflows. I evaluated AI-generated outputs with detailed annotation rubrics, flagging errors in tone, accuracy, and register for repeated quality benchmarking. I developed datasets covering writing edge cases and format diversity to aid large language model evaluation and improvement. • Designed prompts and annotated responses across 10+ writing categories. • Evaluated and annotated data according to strict rubric guidelines. • Benchmarked model quality using diverse evaluation sets. • Identified and documented error patterns for annotation feedback.

2023 - 2024

Education

No Education added yet

Kelvin K. hasn’t added any Education History to their OpenTrain profile yet.

Work History

S

Self-Employed

Freelance Copywriter and Content Writer

Dar es Salaam
2016 - 2022