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Han Ho

Han Ho

AI Quality Assurance Specialist & Data Annotator

VIETNAM flag
Ho Chi Minh City, Vietnam
$30.00/hrExpertOtherAppenCrowdsource

Key Skills

Software

Other
AppenAppen
CrowdSourceCrowdSource
MercorMercor
LionbridgeLionbridge
MindriftMindrift
OneFormaOneForma
Scale AIScale AI

Top Subject Matter

Large Language Models (LLMs)
RLHF
AI model

Top Data Types

TextText
AudioAudio
DocumentDocument

Top Task Types

RLHF
Transcription
Text Generation
Text Summarization
Evaluation Rating
Prompt Response Writing SFT
Question Answering
Classification

Freelancer Overview

With over 3 years of hands-on experience in AI Quality Assurance and Data Annotation, my expertise lies in refining complex Large Language Models (LLMs) through rigorous evaluation methodologies. During my tenure as an AI Trainer at Highbrow Technology Inc., I spearheaded the development of structural evaluation rubrics and managed a team of 40+ annotators. I specialized in executing advanced Reinforcement Learning from Human Feedback (RLHF) tasks and deep-dive Side-by-Side (SxS) comparisons, ensuring the generation of high-fidelity data that strictly adhered to nuanced project guidelines. What sets me apart is my ability to perform expert-level cross-reviews across multi-modal datasets within high-volume, dynamic environments. Recently, on a large-scale multilingual project with RWS via the Multimango platform, I audited the outputs of an independent global rater network, performing critical linguistic judgments, transcription verification, and complex prompt evaluations. My proven capacity to maintain peak accuracy, coupled with a deep understanding of system confidence metrics and user intent, enables me to consistently deliver gold-standard training data that directly elevates AI model performance.

ExpertVietnameseEnglish

Labeling Experience

Linguistic QA Specialist (Multimango Project)

OtherText
Performed comprehensive quality assurance and linguistic evaluation for AI model outputs within a multilingual setting. Audited, reviewed, and verified outputs from a global rater network with a focus on Vietnamese language tasks. Conducted complex prompt evaluations and transcription verification to enforce dataset integrity. • Enforced strict adherence to nuanced linguistic guidelines • Conducted large-scale cross-review and audit on Multimango platform • Ensured integrity of AI training data in dynamic, high-volume projects • Regularly performed expert-level linguistic judgments and prompt quality control

Performed comprehensive quality assurance and linguistic evaluation for AI model outputs within a multilingual setting. Audited, reviewed, and verified outputs from a global rater network with a focus on Vietnamese language tasks. Conducted complex prompt evaluations and transcription verification to enforce dataset integrity. • Enforced strict adherence to nuanced linguistic guidelines • Conducted large-scale cross-review and audit on Multimango platform • Ensured integrity of AI training data in dynamic, high-volume projects • Regularly performed expert-level linguistic judgments and prompt quality control

2026 - 2026

Transcriptionist

OtherAudioTranscription
Delivered precise verbatim transcriptions for diverse audio datasets to meet high standards for AI training. Consistently performed accurate speaker identification, time-stamping, and managed multi-speaker scenarios. Contributed to building gold-standard datasets critical for developing and fine-tuning advanced speech recognition models. • Processed complex acoustic environments and varied audio sources • Maintained strict adherence to quality and consistency benchmarks • Supported creation of training data for speech recognition • Ensured timely completion of transcription projects under tight deadlines

Delivered precise verbatim transcriptions for diverse audio datasets to meet high standards for AI training. Consistently performed accurate speaker identification, time-stamping, and managed multi-speaker scenarios. Contributed to building gold-standard datasets critical for developing and fine-tuning advanced speech recognition models. • Processed complex acoustic environments and varied audio sources • Maintained strict adherence to quality and consistency benchmarks • Supported creation of training data for speech recognition • Ensured timely completion of transcription projects under tight deadlines

2025 - 2026

QA Specialist - AI Trainer

OtherTextRLHF
Oversaw and directly participated in reinforcement learning from human feedback (RLHF) tasks for AI model training. Developed and refined structured rubrics to systematically assess LLM responses for helpfulness and safety. Performed complex side-by-side (SxS) evaluations, quality control, and Vietnamese linguistic QA. • Managed a team of 40+ data annotators ensuring guideline adherence • Executed large-scale RLHF evaluations for generative AI models • Enforced rigorous quality standards and dataset integrity • Leveraged critical thinking to maintain high annotation throughput

Oversaw and directly participated in reinforcement learning from human feedback (RLHF) tasks for AI model training. Developed and refined structured rubrics to systematically assess LLM responses for helpfulness and safety. Performed complex side-by-side (SxS) evaluations, quality control, and Vietnamese linguistic QA. • Managed a team of 40+ data annotators ensuring guideline adherence • Executed large-scale RLHF evaluations for generative AI models • Enforced rigorous quality standards and dataset integrity • Leveraged critical thinking to maintain high annotation throughput

2024 - 2025

Ads Quality Rater

OtherText
Evaluated digital advertisement datasets for relevance and accuracy, improving ad quality. Analyzed user intent and trustworthiness to optimize AI-driven ad recommendations. Maintained high consistency and quality in evaluating multi-faceted data sets for algorithmic refinement. • Rated and reviewed ad creatives and landing pages per complex guidelines • Enhanced end-user experience by aligning content with search algorithm needs • Ensured strict adherence to evaluation criteria for ads • Supported continuous improvement of digital ad AI models

Evaluated digital advertisement datasets for relevance and accuracy, improving ad quality. Analyzed user intent and trustworthiness to optimize AI-driven ad recommendations. Maintained high consistency and quality in evaluating multi-faceted data sets for algorithmic refinement. • Rated and reviewed ad creatives and landing pages per complex guidelines • Enhanced end-user experience by aligning content with search algorithm needs • Ensured strict adherence to evaluation criteria for ads • Supported continuous improvement of digital ad AI models

2024 - 2024

Education

U

University of Economics of Ho Chi Minh City (UEH)

Bachelor of Management, Management

Bachelor of Management
2023

Work History

R

RWS

Linguistic QA Specialist

Ho Chi Minh City
2026 - 2026
R

RWS

Transcriptionist

Ho Chi Minh City
2025 - 2026