Harmonic Design is a Hamilton web design and development studio that builds clean, fast, intuitive websites. We work across the stack, but we specialize in WordPress and eCommerce — deeply enough that our own plugins run on tens of thousands of sites. Whatever you need built, here’s how we do it.
What we can do for you
Website Design & Development
We design and build custom websites that are as functional as they are beautiful — and not just the part your customers see. The admin area gets the same treatment, custom-built around how you actually work, so managing your content is easy, intuitive, and genuinely powerful.
Every build uses the right technology for the job, structured so future changes slot in cleanly instead of getting Frankensteined on top. That’s the difference between a site that gets slower and messier every year and one that’s still fast and pleasant to maintain five years from now. Ours are the second kind.
WordPress Development
We are the WordPress experts. Custom themes, custom plugins, gnarly migrations, performance rescues, scaling an install that’s buckling under growth — if it runs on WordPress, we can build it, fix it, or make it faster.
We’re not just WordPress users, either. We build and maintain production plugins — HD Quiz alone has passed 300,000 downloads and powers quizzes for businesses, universities, and even governments. That means we know WordPress from the inside: clean PHP, modern JavaScript, and core APIs, never page-builder duct tape. When we extend WordPress, it survives updates instead of fighting them.
eCommerce
If you’re a small business just getting your foot in the door, off-the-shelf platforms like Shopify, Square, and WooCommerce are honestly pretty great. We’ll tell you that to your face.
But there’s a ceiling. What happens when you need to change how checkout flows? When the transaction fees start compounding? When your store needs to feel different from the million other shops on the same template? That’s usually when people call us.
HDCommerce is our own eCommerce platform, built and maintained by us for WordPress. It’s lightning fast, secure, and designed to turn visitors into customers — and because we wrote every line, every single aspect can be customized to your business, down to the individual micro-interaction. No workarounds, no “the platform doesn’t support that.” You own your store, outright.
If you want a custom shipping module that doubles the shipping fee, but only on Wednesdays, and if the customer’s name begins with the letter K, and only if the current temperature is over 30, then we can make that happen (but please don’t do this!).
Mobile & Web Apps
Most of your visitors are on their phones, so we design mobile-first — which gives them the best experience and gives you a nice bump in search rankings while it’s at it.
Need an actual app? If it can be built on the web, we can package it as a native mobile app — modern PWAs make apps accessible to businesses of every size, without maintaining two separate codebases. We even built a full video game this way: Emoji Defender, playable on your phone right now. If we can ship a game, we can ship your app.
SEO and Marketing
An SEO walks into a bar, tavern, pub, saloon… — an old SEO joke
A beautiful website doesn’t mean much if nobody ever sees it. Every site we build ships with current on-page SEO standards baked in, so you rank right out of the box. Beyond that:
SEO consulting. A full audit of your existing site to find where the wins are, plus a competition analysis so you know exactly where your top online rivals stand — and what it takes to outrank them.
On-page SEO. We tune your site’s code and content so search engines properly index and understand your business in terms of what customers are actually searching for.
SEO campaigns. A custom monthly program tailored to your budget and goals: high-quality, genuinely relevant backlinks and ongoing content — no link farms, no filler.
Google Ads. We create and manage optimized ad campaigns that bring relevant traffic and real leads, not just clicks.
Want the full picture? Read our plain-language guide to SEO.
Care Plans
A website isn’t finished at launch. Left alone, every WordPress site gets slower and more vulnerable by the month. Our Care Plans cover updates, security hardening, malware removal, performance tuning, backups, and emergency support — you run your business, we keep the site fast, secure, and online. See Care Plans.
Project Consultation
Not ready to hand off a build? We consult on eCommerce, web accessibility (WCAG), performance, security, and search engine optimization. You get straight answers from people who build this stuff daily — including, when it’s the honest answer, “you don’t need us for this.”
Tell us what you need. You’ll get a fixed quote, not an estimate that grows. Get a free quote →