Siyu Qian

Websites, stores
and custom software

I help businesses launch and improve their websites, build software around the way they work, and put AI agents to work inside their systems. I also work with agencies that need an experienced developer.

Discuss your project For agencies

Work directly with Siyu Qian, a senior developer in Auckland.

Innox Trading online storefront

Innox Trading

From phone orders to an online store.

Where I can help

For your business

A new site, a better store, software built for your workflow, or a specific problem in the systems you already have.

New websites & stores

Plan and build a business website or online store, with a way for your team to manage its content.

Discuss a new site

Upgrades & integrations

Improve an existing site, update its CMS, or connect the systems behind ordering and day-to-day work. Start with the part that needs attention.

Discuss an upgrade

Custom software

Internal tools, customer portals and workflows that off-the-shelf products don’t fit. Built around how your team works, from the data model to the screens people use every day.

Discuss custom software

AI agent integration

Connect AI agents to your systems, documents and day-to-day tasks, with clear limits on what they can access and change. Start with one workflow where the time saved is easy to measure.

Discuss AI integration

For agencies & teams

Development support for your designs, an existing codebase or a project that needs an experienced pair of hands.

Keep the client relationship and your delivery process. I can take responsibility for an agreed piece of the build.

How we can work together

Work in practice

All 7 projects
Silver fern fronds in native New Zealand bush

Fernmark

Marketing

Upgrading a licence programme website in phases, while keeping existing pages working and giving editors control of content.

Enko Group logo over a stainless steel gas cooktop

Enko

E-Commerce

Making a large trade catalogue easier to search and order from, with product sheets customers can share.

Tremor Audio shopfront sign listing pianos, drums and keyboards

TremorAudio

E-Commerce

An online instrument shop with thousands of products, inventory synchronisation and clear product categories.

Before we build

Start with the problem and the result you need.

We’ll work out what needs to change and what can stay. That might be a new site, a contained upgrade, custom software, an AI integration or development support for your team.

Before committing to a build, we’ll agree the deliverables, timing and cost. We’ll also cover who maintains the result and what support is needed after handover.

Tell me what you’re working on

Who you’ll work with

I’m Siyu, also known as David.

A senior full-stack developer in Auckland, with about a decade of experience across business websites, e-commerce, software products and AI tooling.

Read my writing

I like to understand a product before I change it.

I work with clients directly and lead engineering at MageBinary part-time. Previously, I worked on Vello and ezyVet at IDEXX, contributing across the stack and leading feature delivery. My project work also includes New Zealand retailers and the FernMark licence website.

You’ll speak with me about the brief and the technical decisions. I’ll be clear about the work I can take on and how it fits with your team.

See my product team experience