How to Choose a Shopify Plus Agency in Australia

Start with the portfolio

Every agency has a portfolio page. Most of them show the same thing: hero images of pretty homepages. That tells you almost nothing about whether they can build what you need.

What to look for instead: Shopify Plus builds specifically (not standard Shopify), stores that are still live and performing (not redesigned six months after launch by a different agency), case studies with measurable outcomes (conversion rate improvements, revenue lift, performance metrics), and technical complexity (headless builds, custom integrations, multi-market setups).

Go to the actual live stores and use them. Add products to cart. Go through checkout. Test the search. Check the page speed. The portfolio page is the trailer. The live store is the movie. Here are a few of ours to start with: Lo & Co, 2XU, and Quad Lock.

Ask about process

How does the agency work? Not in marketing terms but in practical terms. What does the first week look like? How are decisions documented? What's the approval process for design? How is the project managed? What tools do they use for communication?

Good agencies have a clear, documented process they can walk you through. They'll tell you what they need from you at each stage. They'll be specific about timelines and what affects them. They won't promise everything will be done in 6 weeks without understanding your requirements.

Red flags to watch for: an agency that can't tell you who your day-to-day contact will be. A project timeline given before they've asked about your integration requirements. A proposal that's identical in structure to what you'd find on any other agency's website, with no evidence they've thought specifically about your business. Vague answers to direct questions about what happens after launch. Any of these suggest a sales process that's more refined than the delivery process.

Understand the pricing model

How an agency prices their work tells you a lot about how they operate. Three models are common in the Shopify Plus space.

Fixed price

The agency scopes the project, defines deliverables, and gives you a total cost before any work begins. You know what you're paying upfront. The risk is that scope changes cost extra, so it only works well when requirements are genuinely well-defined before the project starts.

Time and materials

You pay for hours worked at a defined rate. More flexibility, less cost certainty. This works best for ongoing development where requirements will evolve, but it's a risky model for a large initial build if you're working to a budget.

Retainer

A monthly commitment for a defined amount of development time. Priority access, consistent velocity, and a predictable monthly cost. This is typically how the relationship works after launch: ongoing development, optimisation, and new features on a rolling basis.

For context, here's how we approach it at Flux. Every project starts with a paid Discovery phase where we define scope, technical requirements, and priorities before any design or development begins. From there we deliver a fixed-price proposal with a clear cost and timeline. No hourly billing, no open-ended engagement during the build. Post-launch, most clients move to a monthly retainer for ongoing development and optimisation. It's the model that gives clients cost certainty upfront and flexibility after launch.

The questions that actually matter

Who will actually be working on my project?

Not the senior team on the pitch. Ask for the names of the developers and designers who will be doing the day-to-day work, and ask to see their specific experience with Shopify Plus builds. The pitch team and the delivery team are not always the same people.

What happens when something goes wrong after launch?

Every build has post-launch issues. What matters is how the agency handles them. Is there a support SLA? Is it included in your retainer or billed separately? Who do you contact and how quickly do they respond? Get this in writing before you sign.

Do you have experience with my specific integration requirements?

If you're running an ERP, a 3PL, or a custom inventory system, ask specifically whether the agency has integrated with it before. General Shopify Plus experience and experience with your particular tech stack are different things. For complex integrations like Cin7 or NetSuite, prior experience matters significantly for both timeline and cost accuracy.

How do you handle scope changes mid-project?

Scope changes happen on every project. What matters is how they're managed. Does the agency have a formal change request process? How quickly can they estimate the cost and timeline impact of a change? An agency that handles scope changes poorly will either absorb them silently (and cut corners elsewhere) or surprise you with invoices at the end of the project. Get the change management process explained before you sign.

Can I speak with a recent client?

Any agency confident in their work will connect you with a recent client without hesitation. If there's resistance or they can only offer testimonials rather than direct introductions, that's worth noting. When you do speak with a reference, ask specifically about how the agency handled problems, not just whether the project was delivered.

What would you cut from scope if budget is tight?

This question reveals how well the agency understands your business priorities. A good answer prioritises the revenue-critical functionality and identifies what can be phased. A vague answer suggests they haven't thought deeply about what actually matters for your specific situation.

What would you tell me not to do?

This is the most revealing question on the list. An agency that's willing to talk you out of something you don't need is an agency that's thinking about your business, not their invoice. If you're wondering whether headless is right for your store, or whether Algolia is worth the investment, the honest answer from a good agency won't always be yes. Talk to our Shopify Plus team and see how we approach it.