孙宇轩

Key Skills

Software

Other

Top Subject Matter

General/multidomain Domain Expertise

Multilingual AI

General AI/Content Moderation/LLM Evaluation

Top Data Types

Text

Image

Document

Top Task Types

Entity (NER) Classification

Classification

Prompt + Response Writing (SFT)

Freelancer Overview

Senior AI Data Annotation / Complex NER Annotator. Core strengths include Internal and Proprietary Tooling. Education includes Bachelor of Science, Fuzhou University (2023). AI-training focus includes data types such as Text and Image and labeling workflows including Entity (NER) Classification, Translation, and Localization.

Labeling Experience

Data Validation QA Specialist

OtherDocument

I conducted comprehensive data validation quality assurance for labeled records. My duties included reviewing over 1,000 records to verify labeling accuracy and completeness. I achieved a 99% accuracy rate in data validation tasks.• Checked labels for consistency against guidelines.• Flagged and corrected errors in annotated datasets.• Provided quality feedback to improve future labeling tasks.• Maintained audit trails for all validation activities.

2024 - 2025

AI Image Prompt Engineer

OtherImagePrompt + Response Writing (SFT)

I created and evaluated AI image prompts using tools like Midjourney and DALL-E. My work focused on prompt engineering to generate high-quality training images. Each image was assessed for fidelity and suitability for machine learning datasets.• Crafted effective prompts for diverse visual concepts.• Conducted image quality evaluation based on project criteria.• Collaborated on refining prompt templates for better outputs.• Documented best practices for prompt-driven image generation.

2024 - 2025

Python Automation Assistant (Data Labeling Support)

Other

I developed and deployed Python automation scripts to aid data preprocessing and cleaning. My focus was on automating text-based data transformations for annotation support. I ensured all scripts adhered to project requirements and efficiency standards.• Designed Python scripts that streamline label-ready dataset generation.• Automated data cleaning to enhance annotation workflows.• Built Excel automation for better labeled data management.• Ensured reproducibility of preprocessing for annotation pipelines.

2024 - 2025

Multi-language Alignment Annotator (CN-EN)

OtherText

I verified the quality of translations in multi-language text datasets focused on Chinese and English. My responsibilities included checking alignment between two languages and ensuring accuracy. I handled over 120 translation validation tasks with a 95% accuracy rate.• Reviewed bilingual content for translation consistency.• Conducted quality assurance on Chinese-English pairs.• Provided assessment feedback to improve translation models.• Maintained thorough documentation for process improvements.

2024 - 2025

Text Annotation Specialist

OtherTextClassification

I performed sentiment labeling, entity recognition, and text classification on various text datasets. My work involved annotating text with precise labels and ensuring high-quality data. I completed over 150 annotation tasks with a 96% accuracy rate.• Conducted detailed sentiment analysis on customer feedback.• Labeled entities and categorized text data for AI model training.• Used Python scripts to clean and validate labeled datasets.• Maintained high annotation standards for data quality.

2024 - 2025

Education

Work History