I’m Jiachen, a product designer focused on complex systems and design infrastructure.

I design UX for data-rich, system-heavy products — things like data analytics platforms, design system, developer tools, and shared UX frameworks.

Snapshot

• Product design across health tech, SaaS, and data platforms
• Deep experience with design systems, tokens, and shared UX patterns
• Hands-on builder — I code and maintain this site with Jekyll, HTML/CSS, and a bit of JavaScript
• Modern workflow — I use AI-assisted tooling (e.g. Cursor, Vercel) in my day-to-day design/frontend work

How this site is built

This portfolio runs on Jekyll and is hosted on GitHub Pages. It started as a fully hand-coded project, and now I run it with a human-in-the-loop AI workflow: I use Figma as a real-time visual anchor, share layout context with AI agents through a local MCP server, let agents generate/refactor parts of the site, and then I review, edit, and polish the code by hand. That visual feedback loop helps me iterate fast while keeping layout and CSS decisions accurate.

I treat AI as a collaborator, not autopilot — I keep the architecture and UX decisions intentional, and I’ll refactor until the HTML/CSS and interactions match the design. It’s a small but realistic version of how I collaborate with engineers: fast iteration, tight feedback loops, and clean implementation.

Selected projects

Microsoft Fabric — Shared UX & design system
Cross-product navigation, workspaces, and patterns on top of Fluent 2.

HUMA — Mobile health app
Patient data entry flows, medical constraints, and documentation for engineers and clinicians.

Collection — Building design systems
How I’ve set up and scaled design systems across different products.

UX reflections

These are selected articles that reflect how I think about UX heuristics, and tooling.

• 简单易用的启发式评估-UX设计师必备-大白话版 - 简书 (How to easily carry out heuristic evaluation for UX review)

• My experience so far: building a design portfolio (now I use Jekyll) - Medium

More work

Some of my more recent work can only be shared privately.
If you’re interested, I’m happy to walk through additional projects during an interview.