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Thembelihle Mhlongo

Thembelihle Mhlongo

AI Response Evaluator - Technology & Internet

SOUTH_AFRICA flag
Johannesburg, South Africa
$20.00/hrIntermediateAppenLabelbox

Key Skills

Software

AppenAppen
LabelboxLabelbox

Top Subject Matter

No subject matter listed

Top Data Types

ImageImage
TextText
VideoVideo

Top Label Types

Segmentation
Text Generation
Text Summarization

Freelancer Overview

I am an AI evaluation and data analytics associate with hands-on experience in reviewing, annotating, and refining AI-generated content for clarity, tone, empathy, and factual accuracy. My background in mathematics and statistics, combined with experience applying structured quality rubrics and scoring systems, enables me to deliver consistent, high-quality data labeling and annotation for NLP tasks. I have evaluated thousands of AI outputs, compared model responses, and improved content alignment with nuanced judgment, particularly in sensitive conversational contexts. I am skilled in fact-checking, instruction adherence, and output quality assurance, and I am comfortable working under tight deadlines while maintaining attention to detail and data integrity.

IntermediateEnglish

Labeling Experience

AI Data Evaluator

Don T DiscloseVideoSegmentation
I worked on a large-scale data labelling and annotation project supporting machine-learning model training and evaluation. My role involved annotating text, image, and short video/GIF data through tasks such as classification, tagging, entity recognition, and comparison-based evaluation, in line with detailed project guidelines. The project operated at scale, comprising tens of thousands of data units, with individual throughput of hundreds of annotations per day across multiple task batches and tight deadlines. Quality was ensured through strict guideline adherence, inter-annotator agreement checks, gold-standard tasks, and regular audits. I consistently met required accuracy thresholds (95% quality scores) and incorporated reviewer feedback to maintain high consistency and reliability across datasets.

I worked on a large-scale data labelling and annotation project supporting machine-learning model training and evaluation. My role involved annotating text, image, and short video/GIF data through tasks such as classification, tagging, entity recognition, and comparison-based evaluation, in line with detailed project guidelines. The project operated at scale, comprising tens of thousands of data units, with individual throughput of hundreds of annotations per day across multiple task batches and tight deadlines. Quality was ensured through strict guideline adherence, inter-annotator agreement checks, gold-standard tasks, and regular audits. I consistently met required accuracy thresholds (95% quality scores) and incorporated reviewer feedback to maintain high consistency and reliability across datasets.

2023 - 2025

Education

U

University of South Africa

Bachelor of Science, Mathematics and Statistics

Bachelor of Science
2023 - 2025

Work History

V

VJ Events

Online Customer Service Representative

Johannesburg
2021 - 2023