Build, migrate or scale your store with a UK-based Shopify Plus development agency your business can rely on. We deliver enterprise-grade Shopify Plus stores, custom checkout builds and complex integrations, fully in-house, from certified Shopify Experts.
✅ Certified by Shopify, not self-declared; verified Official Shopify Experts status
✅Custom checkout builds using Checkout Extensibility and Shopify Functions
✅ Full compatibility across themes, apps and third-party integrations
✅ Thorough QA and load testing before every launch
✅ UK-based delivery with minimal-disruption migrations and launches
Scaling on Shopify Plus only works if the platform underneath it can keep pace. KiwiCommerce designs and develops Shopify Plus stores engineered for rising order volumes, multi-region trading and B2B complexity, without the patchwork of apps that standard builds often rely on.
Our in-house team manages the full build cycle: architecture and app strategy, custom theme development, checkout configuration, integration work and testing, all handled directly rather than passed between subcontractors. New Shopify Plus launch, platform migration, or an existing store that needs extending further, the approach is the same: build for the scale you're heading towards, not just the store you have today.
We work as an extension of your team rather than a one-off supplier, staying involved well past launch day. That means the same developers who built your checkout logic and app integrations are the ones monitoring performance, planning your next release and troubleshooting when something needs attention, so continuity doesn't break down the moment your store goes live.
Get Free ConsultationGrowth exposes the cracks in a store that wasn't built for it. Traffic spikes, checkout customisation and third-party systems all put pressure on a platform that hasn't been architected to handle them. Shopify Plus removes most of those ceilings, but only when the build behind it is done properly.
Built to Hold Up Under Pressure
Order spikes, flash sales and seasonal peaks test a store's architecture, not just its traffic. We build Shopify Plus stores to stay fast and stable when trading gets busiest, not just on a quiet Tuesday.
Checkout That Converts Instead of Losing Sales
Checkout Extensibility and Shopify Functions open up real control over discounts, payment options and shipping rules. Get the logic wrong and it costs conversions; we build it right the first time.
Every System Talking to Your Store Reliably
Your ERP, CRM, fulfilment and marketing tools all need to sync without dropping data. We configure and stress-test every integration so nothing quietly fails in the background.
Ready for New Markets From Day One
Multi-currency and multi-language trading come built into Shopify Plus. We set the foundations up correctly from the start, so expanding into a new region doesn't mean rebuilding the store around it.
Bespoke themes built from scratch using Liquid and the Shopify 2.0 sections framework. No pre-built templates, ever.
Custom checkout logic for discounts, payment methods and shipping rules, built to stay compatible with future Shopify platform updates.
Company accounts, custom catalogues, tiered pricing and payment terms configured for your wholesale and B2B trading requirements.
Migrating from Magento, WooCommerce or a legacy platform to Shopify Plus without losing search visibility, order history or site performance.
Private and public app development built to Shopify CLI and Polaris standards, plus integration of the third-party tools your operation depends on.
Speed, Core Web Vitals and load testing for peak trading, backed by retainer-based support once your store is live.
Shopify Plus continues to expand what enterprise merchants can build natively on the platform, reducing the need for costly custom workarounds.
Custom checkout logic without relying on Shopify Scripts, which is being retired, with functionality stopping on 30 June 2026.
Native company accounts, custom catalogues and payment terms, built directly into the platform rather than bolted on through apps.
Shopify Plus stores get significantly higher API limits than standard Shopify, supporting more complex integrations at scale.
Built-in workflow automation for order processing, inventory management and customer tagging, reducing manual operational work.
A successful Shopify Plus build requires careful planning, technical expertise and thorough testing. Our process is designed to minimise risk and preserve store continuity from discovery through to launch.
We review your current setup or, for new builds, your business requirements, growth plans and any systems that need to connect to your store.
We map out the app stack, integration layer and checkout structure before writing a line of code, deciding what gets custom-built and what's sourced from the App Store.
Themes are coded from scratch, with custom checkout logic, B2B functionality or other bespoke features built where standard tools fall short.
Third-party tools, payment gateways and internal systems are integrated and configured, then every checkout flow and breakpoint is tested, including load testing for peak trading periods.
We manage go-live with minimal disruption, then offer retainer-based support for app updates, performance monitoring and continuing development.
Every product, price and customer record is checked against source data before go-live. Nothing gets missed in the move to a live environment.
Layouts, fonts and branding are reviewed across every page and breakpoint. What you approved in design is exactly what ships.
Discount rules, payment options and shipping logic are tested against real order scenarios. Edge cases get caught before customers do.
ERPs, CRMs, fulfilment tools and marketing apps are tested end to end. Data flows correctly in both directions before launch.
Payment gateways are checked against PCI DSS requirements and tested across every supported method. Transactions stay secure from day one.
Redirects, metadata, structured data and site speed are checked before go-live. Your search visibility carries over rather than resets.
Our developers hold verified Official Shopify Experts status, assessed directly against Shopify's own standards, not a self-declared credential.
Every Shopify Plus store is different. We plan your architecture, app stack and checkout structure around your specific business requirements.
Clear scoping and fixed-price projects mean no surprises partway through your build.
Every developer, project manager and support engineer on your project is UK-based, working from our own team rather than subcontracted out.
We test and optimise for high-traffic events, so your store holds up when volumes spike, not just on an average day.
Our partnership continues after launch, with retainer-based support covering app updates, performance monitoring and new feature development.
We came to KiwiCommerce with just an idea and a product range. They handled everything from design to launch, and the store looked and worked exactly how we'd pictured it, without us having to chase for updates.
Our old store looked dated and didn't convert. The custom theme KiwiCommerce built completely changed how customers experience our brand, and our conversion rate improved within weeks of launch.
We needed our Shopify store talking to our stock system and email platform without constant manual updates. KiwiCommerce got everything integrated properly, and it's just worked ever since.
What sold us on KiwiCommerce wasn't just the build, it was knowing someone would still answer the phone after launch. Any time we've needed a tweak or a new feature, they've turned it around quickly.
Shopify & eCommerce Development Experience
Delivered Across Shopify and Shopify Plus
Currently on Active Support Retainer
Monitoring & Support
Frequently Asked Questions
A Shopify Plus development agency builds, migrates and maintains stores on Shopify's enterprise-tier platform, covering custom theme development, Checkout Extensibility and Shopify Functions builds, B2B configuration, app development, and platform migrations from other systems, along with ongoing support once your store is live.
Costs depend on the scope of the build, whether it's a custom theme, a full migration, or ongoing custom development. We work on fixed-price projects for defined scopes and retainer arrangements for ongoing support. Contact us for a quote based on your specific requirements.
Most migrations from another platform take between six and twelve weeks, depending on catalogue size, the number of integrations, and how much custom functionality needs rebuilding. We scope an exact timeline during discovery before development begins.
Yes. We build both private apps for your store specifically and public apps for the wider App Store, using Shopify CLI and Polaris standards so functionality stays compatible with future platform updates.
We work across both. If your business is close to needing Shopify Plus but isn't there yet, we can advise honestly on whether the upgrade makes sense now or whether standard Shopify still covers your needs.
Shopify Scripts is being retired, with functionality stopping on 30 June 2026. If your checkout relies on Scripts for discounts, payment filtering or shipping rules, it needs rebuilding in Shopify Functions before that date. We're already migrating client stores across.