Sisipho Tyumbu

Key Skills

Software

Appen

Axiom AI

Clickworker

CloudFactory

CrowdFlower

Data Annotation Tech

Dataloop

Figure Eight

Labelbox

Label Studio

Lionbridge

Mercor

Mindrift

OneForma

Scale AI

Toloka

Telus

Other

Top Subject Matter

No subject matter listed

Top Data Types

Image

Text

Video

Top Label Types

Bounding Box

Entity Ner Classification

Evaluation Rating

Prompt Response Writing SFT

Question Answering

Freelancer Overview

I am an expert AI data labeling and annotation specialist with 6+ years of experience across RWS Diamond, TELUS, and Aligner projects. I have extensive hands-on experience in image, video, and text annotation, including computer vision for self-driving datasets, multimodal content labeling, and LLM evaluation in English. My work consistently emphasizes accuracy, guideline compliance, and high-quality outputs, ensuring AI models are trained with precision. I am versatile across multiple tools including Figure Eight, Clickworker, Labelbox, Label Studio, and internal enterprise platforms. I excel in extracting meaningful insights from complex datasets, performing LLM evaluation, text generation assessment, and multimodal annotation tasks. My combined expertise in AI data labeling, NLP, and computer vision allows me to contribute efficiently to global AI training projects, consistently delivering reliable, scalable, and high-quality results.

Labeling Experience

AI image data labelling expert

MindriftImageBounding BoxClassification

Annotated images for AI training, including bounding boxes, polygons, and classifications. Ensured high-quality, consistent labeling for autonomous driving and computer vision models. Combined label verification and quality control for large-scale datasets.

Annotated images for AI training, including bounding boxes, polygons, and classifications. Ensured high-quality, consistent labeling for autonomous driving and computer vision models. Combined label verification and quality control for large-scale datasets.

2021

AI Video Data labelling/Annotation

TelusVideoSegmentationClassification

Performed frame-by-frame video annotation, labeling moving objects and activities. Maintained high accuracy and consistency for AI video datasets. Integrated labeling and annotation tasks for reliable model training

Performed frame-by-frame video annotation, labeling moving objects and activities. Maintained high accuracy and consistency for AI video datasets. Integrated labeling and annotation tasks for reliable model training

2021

AI Text Generation Annotator

ClickworkerTextClassificationQuestion Answering

Labeled and evaluated AI-generated text for quality, accuracy, and alignment with prompts. Performed classification, QA, summarization, and translation tasks. Combined annotation and evaluation to ensure high-quality NLP training data.

Labeled and evaluated AI-generated text for quality, accuracy, and alignment with prompts. Performed classification, QA, summarization, and translation tasks. Combined annotation and evaluation to ensure high-quality NLP training data.

2020

AI Audio Data Labeler & Annotator

TelusAudioPolygonClassification

Annotated and evaluated audio datasets for AI training, including transcription, classification, and quality assessment. Combined labeling and evaluation tasks to ensure accurate, high-quality data for speech recognition and NLP audio models.

Annotated and evaluated audio datasets for AI training, including transcription, classification, and quality assessment. Combined labeling and evaluation tasks to ensure accurate, high-quality data for speech recognition and NLP audio models.

2021 - 2025

Education

Work History