# Chan Hen

Chan Hen is a remote worker on Himalayas, AI Trainer (Freelance) at Data Annotation, based in United States.

Source: https://himalayas.app/@chanhen

```text
Software engineer building full-stack apps with Next.js and Supabase; shipped Hourelle, an event coordination app with live chat and scheduling.
```

| Detail | Value |
| --- | --- |
| Availability | Looking for a job |
| Location | United States |
| Authorized to work in | United States |
| Salary expectations | 60k+ USD |
| Job categories | Software Engineer, AI Trainer |
| Skills | Software Engineering, Fullstack Development, AI, Reinforcement Learning from Human Feedback, Large Language Models, Progressive Web Apps, REST APIs, OAuth, Row level security, End To End Testing, TypeScript, JavaScript, Python, SQL, React |
| Website | https://chanhen.space |
| Portfolio | https://chanhen.space |
| LinkedIn | https://linkedin.com/in/chan-hen-13727b233 |
| GitHub | https://github.com/OfficialChanHen |

## About

```text
At Data Annotation, I evaluate and refine AI-generated code responses for technical accuracy and logical consistency. I use JavaScript, TypeScript, Python, and SQL to create training pairs and contribute to RLHF workflows.

At Nodeoven, I delivered a commercial mortgage lender dashboard end-to-end, prototyping the mobile app in Figma and implementing it with React Native and TypeScript. I then transitioned the product to a Progressive Web App using Next.js and Tailwind CSS.

I architected and shipped Hourelle, a full-stack event coordination app built with Next.js, TypeScript, and Supabase. I also built a personal portfolio with GSAP scroll-triggered animations and integrated the Spotify Web API to display recently played or currently playing tracks.
```

## Experience

### AI Trainer (Freelance) (current)

Data Annotation. Apr 2026 - Present

```text
Evaluated and refined AI-generated code responses for technical accuracy and logical consistency, contributing to machine learning training datasets. Applied expertise in JavaScript/TypeScript, Python, and SQL to craft prompt-response training pairs and improve AI model performance through RLHF workflows.
```

Skills: JavaScript, TypeScript, Python, SQL, Machine-Learning, RLHF, Data-Quality, Prompt-Engineering

### Software Engineer

Nodeoven. Aug 2025 - Nov 2025

```text
Delivered a lender's dashboard for commercial mortgage loans end-to-end, designing and prototyping the mobile app in Figma and implementing it in React Native with TypeScript. Transitioned the product to a scalable Progressive Web App using Next.js and Tailwind CSS with intelligent component architecture.
```

Skills: Figma, React-Native, TypeScript, Next.js, Tailwind, PWA, Component-Architecture

## Education

### University of Wisconsin-Madison

Bachelor of Science, Computer Science; Data Science. Grade: 3.571

```text
Pursued a double major in Computer Science and Data Science with a minor in Asian American Studies, graduating in May 2025 with a GPA of 3.571.
```

## Tech stack

- GitHub
- React Native
- Expo
- PostgreSQL
- Next.js
- Tailwind CSS
- Figma
- React
- JavaScript
- Python
- Java
- Go
- C
- Vercel
- TypeScript
- Git
- SQL
- Supabase
- Playwright
- Resend
- Claude Code

To contact Chan, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire).

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