Shopify Plus

Flux, a Shopify Plus Agency for brands that take commerce seriously.
Strategic design. Advanced engineering. Long-term platform partnerships. We build Shopify Plus commerce for brands with product-market fit and serious growth.
View our Work
14 years of Shopify.
One focus.
Flux is a Shopify Plus agency, digital by default - distributed across Melbourne, Los Angeles, and London by design. We work exclusively on Shopify and Shopify Plus, and have since 2012.

We design, engineer, and maintain commerce infrastructure for brands that have found product-market fit and are ready to scale. From conversion-focused UX to headless architecture on Hydrogen, our work spans the full spectrum of what Shopify Plus can do.

We work best with brands doing $5M-$100M+ in annual revenue. Brands that care about how their platform performs, not just how it looks. If you're building a category leader, we should talk.
About us

14+

Year in ecommerce

150+

Shopify stores launched

$500M+

in client revenue
What a Shopify Plus agency actually does.
The gap between a basic Shopify store and a properly engineered Shopify Plus platform is enormous. Here's what working with a specialist agency looks like versus figuring it out in-house.

Strategic Design

UX architecture built around how your customers actually shop. Conversion-optimised layouts. Responsive design systems that look sharp on every device. Checkout flow engineering that reduces drop-off and increases average order value.


Advanced Engineering

Custom Shopify Plus builds, headless commerce on Hydrogen with Sanity and Algolia, complex third-party integrations, platform migrations from Magento, WooCommerce, and BigCommerce. Performance engineering that keeps your site fast under load.


Platform Partnerships

Ongoing retainers for feature development, integration maintenance, conversion testing, and strategic upgrades. Your platform evolves alongside your business. We stay close and keep things moving forward.

View all Services
Headless Shopify Plus. When liquid isn't enough.
Some brands need more flexibility than a standard Shopify theme can deliver. Headless architecture separates the frontend experience from the backend commerce engine, giving you complete control over how your store looks, feels, and performs.

Our headless stack runs on Hydrogen , Sanity , and Algolia . This combination delivers sub-second page loads, total design freedom, and a content workflow that marketing teams can actually use without developer support.

We've delivered headless builds for brands like Carwyn Cellars, Lo & Co Interiors, Coffee Company, and Projecta. Each project required a different approach to content architecture, product discovery, and checkout integration. The stack stayed the same. The implementation was bespoke every time.

See our Services
Global Reach.
Digital by default.

Distributed across Melbourne, Los Angeles, and London - by design. No offices, no overhead. Senior people who know the platform, available when your business needs them.

Los Angeles - la@flux.agency

London - london@flux.agency

Melbourne (HQ) - hello@flux.agency


Work with us

Frequently Asked Questions

If you have more questions, we're happy to answer them - just reach out.

What does a Shopify Plus agency do?

A Shopify Plus agency designs, builds, and maintains ecommerce platforms on Shopify Plus. This includes UX design, custom theme development, headless architecture, third-party integrations, platform migrations, and ongoing optimisation. At flux.agency, we cover the full lifecycle from discovery through to long-term partnership.

How much does a Shopify Plus build cost?

A Shopify Plus project with flux.agency typically ranges from $30,000 to $150,000+ depending on scope. A standard Shopify Plus theme build sits at the lower end. A headless build with custom integrations and complex product architecture sits at the upper end. We scope every project individually and provide a fixed-price proposal after discovery.

How long does a Shopify Plus project take?

Most Shopify Plus builds take 3-6 months from discovery to launch. Timelines depend on project complexity, content readiness, and the number of third-party integrations involved. Migrations can be faster if the source platform data is well-structured.

Is Shopify Plus right for my business?

If your revenue is approaching or exceeds $4M annually, the lower transaction fees on Shopify Plus typically make it worthwhile. Beyond the fee threshold, Shopify Plus offers multi-store management, customisable checkout via Scripts and Functions, wholesale channels, and dedicated support. We assess fit honestly during discovery and will tell you if standard Shopify is the better call.

What's the difference between a Shopify Plus agency and a regular Shopify agency?

Shopify Plus introduces complexity that standard agencies aren't equipped to handle. Custom checkout logic, headless architecture, multi-store internationalisation, and enterprise-grade integrations all require deep platform knowledge. flux.agency has worked exclusively on Shopify since 2012 and has delivered Shopify Plus projects for brands like 2XU, Quad Lock, Thankyou, and Cambridge Clothing.

Do you offer ongoing support after launch?

Yes. Most of our client relationships extend well beyond launch through platform partnership retainers. These cover feature development, integration maintenance, performance monitoring, conversion testing, and strategic platform roadmapping. We structure retainers around sprint durations rather than fixed dollar amounts, giving you flexibility in how support hours are allocated.

MEL • LA • LON
Now Accepting Q3 Projects