Quick Answer: What Does a Shopify Plus Ecommerce Agency Do?
A Shopify Plus ecommerce agency designs, develops, migrates, integrates, and optimizes stores running on Shopify Plus. The work typically includes custom storefront development, large-catalog architecture, advanced checkout customization, B2B functionality, international storefront requirements, ERP or 3PL integrations, performance optimization, analytics, and migration from legacy ecommerce platforms.
The important distinction is not simply whether an agency knows Shopify. It is whether the team understands the operational and technical requirements that appear when Shopify becomes infrastructure for a larger ecommerce business.
If you're evaluating partners now, Liquid Lemon's Shopify Plus agency services cover custom storefront design and development for growing DTC brands.
What services does a Shopify Plus ecommerce agency provide?
Most Shopify Plus engagements combine several of the following disciplines:
- Storefront strategy and UX: information architecture, navigation, collections, PDPs, cart, mobile experience, and merchandising
- Custom Shopify development: custom Liquid sections, theme architecture, app integrations, APIs, and reusable storefront components
- Advanced checkout work: Plus-specific checkout UI extensions, Checkout Blocks, payment and delivery customizations, and custom applications where appropriate
- Platform migration: moving products, customers, orders, content, URLs, integrations, and SEO signals from another ecommerce platform
- Systems integration: ERP, WMS, 3PL, PIM, subscriptions, loyalty, customer support, analytics, and other business-critical platforms
- Performance: Core Web Vitals, JavaScript and CSS weight, image delivery, app impact, and storefront rendering
- B2B and international commerce: workflows that take advantage of Shopify Plus features for larger or more complex merchants
- Measurement: analytics, pixels, customer events, consent management, and testing before launch
Not every Shopify Plus store needs every one of these services. A good agency should identify which problems actually require custom work instead of treating enterprise complexity as the default.
What makes Shopify Plus different from standard Shopify?
Shopify Plus uses the same underlying commerce platform as Shopify's other plans, but adds capabilities intended for higher-volume and more operationally complex businesses.
One important difference is advanced checkout customization. Shopify makes some checkout and account extensions available across its plans, while Plus merchants receive additional capabilities on the information, shipping, and payment pages and can use custom applications for certain Shopify Functions-based logic.
Plus can also be relevant for businesses with B2B requirements, high-volume launches, complex organizational structures, or other enterprise commerce needs.
The platform itself does not fix a weak storefront, however. Upgrading plans does not automatically improve navigation, product pages, mobile UX, merchandising, or conversion.
When does a brand actually need a Shopify Plus ecommerce agency?
A specialized Shopify Plus partner becomes useful when the project stops being a straightforward theme implementation and starts involving architecture.
Common triggers include:
- Migrating from Magento, Adobe Commerce, BigCommerce, WooCommerce, Salesforce Commerce Cloud, or another established platform
- A large or complicated product catalog
- Custom ERP, WMS, PIM, or 3PL connections
- Advanced checkout requirements
- B2B and DTC operating from the same commerce stack
- Complex international requirements
- A high-volume storefront that has accumulated too many apps, scripts, and workarounds
- A marketing team that needs reusable landing-page and merchandising components without developer involvement for every change
If the primary problem is a legacy platform migration, start with our Shopify migration services.
Why doesn't upgrading to Shopify Plus automatically improve conversion?
Shopify Plus changes the capabilities available to the business. It does not automatically change how well the storefront communicates or converts.
A brand can upgrade to Plus and still have:
- Confusing navigation
- Weak product-page hierarchy
- Slow mobile templates
- Too many third-party scripts
- Unnecessary apps
- Poor search and filtering
- A rigid theme that makes marketing tests difficult
That distinction matters because platform architecture and storefront architecture solve different problems.
We cover the storefront side in more detail in our guide to outgrowing your Shopify theme.
What should a strong Shopify Plus agency actually be good at?
1. Storefront architecture
A Plus agency should understand how product catalog structure, collection logic, navigation, search, merchandising, and PDP architecture fit together.
Our Gymshark Shopify Plus case study is an example of this problem at large-catalog scale: the work went beyond visual redesign into product discovery, collections, filtering, PDP hierarchy, and performance.
2. Shopify-native development
The goal should not be to custom-code everything. It should be to understand what Shopify already handles well, what an established app should handle, and where custom development creates a real advantage.
That includes fluency with Liquid, theme architecture, Shopify APIs, app extensions, Shopify Functions, and the current Checkout Extensibility framework.
3. Advanced checkout implementation
Shopify Plus provides advanced checkout capabilities that are not available in the same form on lower plans, particularly across the information, shipping, and payment stages.
A qualified partner should know when Checkout UI Extensions, Checkout Blocks, Shopify Functions, or a custom app are appropriate—and when the default checkout is better left alone.
4. Performance engineering
Performance work should focus on the complete storefront rather than chasing a single speed score.
That means reviewing JavaScript execution, CSS, third-party apps, image delivery, template complexity, and Core Web Vitals. Google's current threshold for a "good" Largest Contentful Paint is 2.5 seconds or less at the 75th percentile, but the practical goal is a storefront that remains responsive under real customer conditions.
See our guide to Shopify speed optimization and conversions for the broader performance framework.
5. Systems integration
For larger merchants, some of the most difficult Shopify Plus work happens behind the storefront.
ERP, PIM, WMS, subscriptions, fulfillment, inventory, customer accounts, loyalty, and analytics all need clear ownership and reliable data flow.
An agency that specializes only in visual design can be the wrong partner when these systems are the real source of project risk.
6. A storefront your internal team can actually operate
A custom theme should not force the marketing team to file a development ticket every time it needs a new landing page or merchandising layout.
Reusable Shopify sections and modular components let teams create new page combinations while the design system and codebase remain controlled.
Shopify Plus agency vs standard Shopify agency
| Requirement | Standard Shopify Agency | Shopify Plus Ecommerce Agency |
|---|---|---|
| Custom theme design and development | Common | Common |
| Liquid and theme architecture | Common | Common |
| Advanced checkout customization | Limited by plan capabilities | Core Plus competency |
| Large catalog architecture | Varies | Often required |
| ERP / WMS / PIM integrations | Varies | Common in enterprise projects |
| B2B implementation | Limited depending on stack | Common Plus use case |
| Legacy-platform migration | Varies | Often a core capability |
| Multi-stakeholder enterprise delivery | Varies | Often required |
How much does a Shopify Plus agency cost?
Agency implementation cost is separate from the Shopify Plus software subscription.
Shopify currently lists its U.S. Plus platform fee at $2,500 per month on a one-year term or $2,300 per month on a three-year term. Agency costs vary separately based on storefront scope, integrations, migration complexity, catalog size, backend requirements, and delivery model.
Rather than duplicate the pricing discussion here, see our full breakdown of Shopify Plus agency costs.
Fixed scope vs hourly Shopify Plus development
Neither pricing structure is automatically right for every project.
Hourly or time-and-materials work can make sense when requirements genuinely cannot be defined in advance, particularly around legacy infrastructure and complex integrations.
Fixed-scope work is useful when the problem can be audited and defined before development begins because the brand knows the deliverables, timeline, and budget upfront.
Liquid Lemon uses a fixed-scope sprint model for storefront projects because our work is concentrated on the design and development layer rather than open-ended enterprise consulting.
How should you choose a Shopify Plus ecommerce agency?
Ask potential partners questions that expose how they actually work:
- What part of this project genuinely requires Shopify Plus expertise?
- Who will design and build the store after the sales process?
- Which requirements will be native Shopify, third-party apps, or custom development?
- How will the team protect existing SEO, analytics, and integrations during launch?
- What assumptions could change the quoted scope or timeline?
- Can the internal marketing team operate the storefront without relying on the agency for routine changes?
- Does the agency have relevant work at your catalog and operational complexity?
Our complete guide to hiring a Shopify agency covers the evaluation process in more detail.
Where Liquid Lemon fits
Liquid Lemon is a Shopify / Shopify Plus design + development studio built for brands that need a custom storefront without a traditional multi-month agency process.
We focus on the storefront layer: UX, visual design, PDPs, collection architecture, custom theme development, performance, tracking, and launch.
That model is a strong fit when the primary problem is the customer-facing Shopify experience. A brand whose project is dominated by SAP middleware, extensive legacy-system consulting, or a large multi-country stakeholder program may be better served by a larger enterprise systems consultancy.
If the fit is the storefront, explore our Shopify Plus agency services.
Written by Andrew Zam, Co-founder of Liquid Lemon, a Shopify / Shopify Plus design + development studio for DTC brands.
