Xin H.

Key Skills

Software

CVAT

Scale AI

Data Annotation Tech

Labelbox

Top Subject Matter

Generative AI

Large Language Models

Computer Vision

Top Data Types

Text

Document

Image

Top Task Types

RLHF

Bounding Box

Segmentation

Classification

Freelancer Overview

As an AI Prompt Engineer and Data Quality Specialist, I bring practical experience in evaluating Large Language Models (LLMs) and optimizing generative AI workflows, particularly in text and high-quality visual content generation. I specialize in Prompt Engineering and Reinforcement Learning from Human Feedback (RLHF), ensuring outputs align with strict safety and contextual guidelines. Backed by a 10-year professional background in rigorous technical design and Quality Assurance (QA), I apply exceptional precision, analytical problem-solving, and a zero-tolerance approach to errors in data evaluation. As a native Chinese speaker with professional technical English comprehension, I excel at digesting complex instructions to deliver high-fidelity training data.

Labeling Experience

AI Prompt Engineer & Project Lead

TextRLHF

As an AI Prompt Engineer and Project Lead, I engineered complex prompts and evaluated large language model outputs. My work involved ranking and refining AI-generated content through principles of Reinforcement Learning from Human Feedback. I ensured outputs met strict guidelines for accuracy, coherence, and safety. • Designed, tested, and improved prompts for ChatGPT and Gemini. • Evaluated and rated AI-generated text and visual content for quality and safety. • Developed and implemented standardized operating procedures for prompt engineering. • Led content generation workflows with a strong focus on high-fidelity evaluation.

2025 - 2026

Education

Work History