Jaffer Kimitei

Key Skills

Software

Doccano

Labelbox

Scale AI

Toloka

iMerit

Clickworker

Top Subject Matter

Natural Language Processing (NLP)

Conversational AI

Sentiment Analysis

Top Data Types

Text

Audio

Image

Document

Top Task Types

Classification

Transcription

Bounding Box

Freelancer Overview

AI Data Annotation Specialist (Freelance). Brings 5+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Doccano, Labelbox, and Scale AI. Education includes Bachelor of Science, Jomo Kenyatta University of Agriculture and Technology (2022). AI-training focus includes data types such as Text, Audio, and Image and labeling workflows including Classification, Transcription, and Bounding Box.

Labeling Experience

AI Data Annotation Specialist (Freelance)

LabelboxImageBounding Box

I contributed to computer vision datasets through image annotation tasks, focusing on bounding box and segmentation labeling. My tasks involved precise identification and labeling of visual objects within static images for AI model training. Adherence to strict annotation conventions and use of advanced labeling tools ensured quality and scalability of image data. • Executed image annotation with bounding box and segmentation methods • Leveraged platforms such as Labelbox, Scale AI, and Toloka • Participated in dataset quality assurance by reviewing and correcting annotations • Enabled the development of robust computer vision models through high-quality data labels

I contributed to computer vision datasets through image annotation tasks, focusing on bounding box and segmentation labeling. My tasks involved precise identification and labeling of visual objects within static images for AI model training. Adherence to strict annotation conventions and use of advanced labeling tools ensured quality and scalability of image data. • Executed image annotation with bounding box and segmentation methods • Leveraged platforms such as Labelbox, Scale AI, and Toloka • Participated in dataset quality assurance by reviewing and correcting annotations • Enabled the development of robust computer vision models through high-quality data labels

2023 - Present

AI Data Annotation Specialist (Freelance)

TolokaAudioTranscription

In this role, I performed transcription and validation of speech datasets in English and Swahili for AI and speech recognition projects. I ensured linguistic and contextual accuracy by reviewing transcribed audio for errors and inconsistencies. My work supported both data quality assurance and enhancement of speech-focused AI models. • Conducted high-fidelity transcription and dataset validation • Utilized platforms including Toloka, iMerit, and Clickworker for workflow management • Adhered to strict quality benchmarks throughout all projects • Processed substantial volumes of audio files to support robust machine learning outcomes

In this role, I performed transcription and validation of speech datasets in English and Swahili for AI and speech recognition projects. I ensured linguistic and contextual accuracy by reviewing transcribed audio for errors and inconsistencies. My work supported both data quality assurance and enhancement of speech-focused AI models. • Conducted high-fidelity transcription and dataset validation • Utilized platforms including Toloka, iMerit, and Clickworker for workflow management • Adhered to strict quality benchmarks throughout all projects • Processed substantial volumes of audio files to support robust machine learning outcomes

2023 - Present

AI Data Annotation Specialist (Freelance)

DoccanoTextClassification

As an AI Data Annotation Specialist, I contributed expert-level annotation and validation of large-scale text datasets for NLP systems. My responsibilities included performing sentiment analysis, intent classification, entity recognition, and text categorization using detailed project guidelines. I ensured high annotation accuracy and consistency while meeting strict quality benchmarks and productivity KPIs. • Applied annotation guidelines to maintain consistency across extensive datasets • Conducted conversational AI annotation for LLM training, including dialogue evaluation and response ranking • Utilized tools such as Doccano, Labelbox, Scale AI, Toloka, iMerit, and Clickworker for annotation tasks • Reviewed and corrected machine-generated annotations to optimize dataset reliability

As an AI Data Annotation Specialist, I contributed expert-level annotation and validation of large-scale text datasets for NLP systems. My responsibilities included performing sentiment analysis, intent classification, entity recognition, and text categorization using detailed project guidelines. I ensured high annotation accuracy and consistency while meeting strict quality benchmarks and productivity KPIs. • Applied annotation guidelines to maintain consistency across extensive datasets • Conducted conversational AI annotation for LLM training, including dialogue evaluation and response ranking • Utilized tools such as Doccano, Labelbox, Scale AI, Toloka, iMerit, and Clickworker for annotation tasks • Reviewed and corrected machine-generated annotations to optimize dataset reliability

2023 - Present

Education

Work History