01
Shopify Platinum Partner
Top-tier status earned by shipping for top-tier merchants. Headless, OS 2.0, Plus, B2B and Markets.
Shopify Plus Agency in London
SeedCMS has been building enterprise Shopify Plus stores from London since 2021. As one of only five Shopify Plus Platinum Partners in the UK and one of 27 globally we sit at the top tier of the Shopify partner ecosystem. Our London team works alongside our California studio to give enterprise brands 16 hours of active production coverage per day. We specialise in complex platform migrations, custom theme development, AI-powered commerce, and long-term retained partnerships with brands that treat their storefront as a product.
One of five Shopify Plus Platinum Partners in the UK based in London.
15 years of experience across Consumer Goods, Apparel, Beauty, and Entertainment from cult DTC to global enterprise.
Built tooutrunbigger agencies.
A senior team across two cities, deep in Shopify and AI, working at startup speed without sacrificing the rigor enterprise clients expect.
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Leading AI integration agency
Production-grade AI for commerce: personalization, support agents, copilots, predictive segments.
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Lean and fast
A small senior team no juniors fronting your account. Discovery to launch in weeks, not quarters.
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Two continents
16 hours of production per day. Offices in California and London cover your full workday from morning standup to last-light Slack.
What we ship.
Six practices, deployed by senior in-house teams in California and London. Every engagement combines the right mix.
Platform Migrations
Replatforming done right is a competitive advantage. Done wrong, it's a costly setback. Since 2018, Seed CMS has completed over 110 migrations to Shopify Plus a depth of experience no checklist can replicate. We migrate brands from Magento, Salesforce Commerce Cloud, WooCommerce, and BigCommerce, handling data mapping, redirect strategy, integration re-architecture, theme build, and go-live cutover. Our phased approach minimizes downtime, protects your SEO equity, and delivers a fully operational store from day one.
Development
For brands that have outgrown theme templates, our Shopify Theme Development practice delivers fully custom storefront builds engineered for performance, flexibility, and brand fidelity. We work exclusively in Online Store 2.0 building modular, merchant-editable sections that give your team full control without compromising design integrity. Our Liquid developers write clean, maintainable code with performance baked in: optimized asset delivery, minimal JavaScript overhead, and Core Web Vitals scores that support your SEO and paid media investment.
CRO Services
For Shopify Plus brands investing in traffic, small gains in conversion rate translate directly to significant revenue growth. We start with a full-funnel audit analyzing your analytics, session recordings, heatmaps, and checkout data to surface the friction costing you conversions. From there, we build a prioritized roadmap and run structured A/B and multivariate tests to validate improvements before they go permanent. Everything we do is measured, documented, and designed to compound.
Custom Apps
Every high-volume Shopify Plus store eventually hits a ceiling with off-the-shelf apps. We design and build private Shopify apps, custom API integrations, and backend systems that fit your business exactly. Our team works with the Shopify Admin API, Storefront API, Shopify Functions, and Checkout Extensibility to extend your store's capabilities without compromising platform stability. Common engagements include ERP and 3PL integrations, custom pricing and discount logic, and bespoke loyalty systems all built to Shopify's API versioning standards and designed for long-term maintainability.
UI/UX Design
Your storefront is your most powerful sales channel and first impressions are everything. Our UX & Interface Design team brings together brand strategy, user research, and interface craft to design Shopify experiences that convert without compromising on aesthetics. Every project starts with understanding your customer journey, then progresses through wireframes, design systems, and high-fidelity mockups that give developers a precise blueprint and your customers a seamless path to purchase.
Ongoing Support
The most successful Shopify Plus brands treat their storefront as a product one that requires a consistent, trusted technical team to evolve alongside the business. As your retained partner, we embed into your operation, learning your stack, integrations, and commercial priorities. Monthly retainer hours flex across new feature development, platform updates, A/B testing, performance monitoring, and rapid issue response. No account handoffs, no re-briefing just a senior team that's as invested in your store's performance as you are.
Selected work.
01
07
Kith
Luxury Streetwear Icon
10+ YrsPartnership
CustomDevelopment
CustomMiddleware
Stussy
Streetwear Fashion Mainstay
MigrationAdobe to Shopify
CustomDevelopment
6+ YearsPartnership
Orgain
Full Support For A Nutrition Staple
MigrationAdobe to Shopify
CustomDesign + Development
CROOngoing Services
Kate Somerville
A skincare icon, replatformed in 30 days.
MigrationSFCC to Shopify
CustomDevelopment
CROOngoing Services
Golf Wang
From Album Drops to Converse Releases
MigrationBig Comm to Shopify
CustomDevelopment
6+ YearsPartnership
Design Essentials
From B2B to D2C, we covered it.
MigrationBig Comm to Shopify
CustomDevelopment
CustomApp Development
Anastasia Beverly Hills
Large Scale SFCC Migration
MigrationSFCC to Shopify
CustomDevelopment
CustomApps
Trusted Partners.
Seedcms uses the following platforms across our builds we trust what they do and we're subject-matter experts in implementation and execution.
Let's build
Tell us where you want commerce to go.
30-minute intro call. No deck, no sales theater just senior people, your roadmap, and an honest answer on whether we're the right fit.
Book an intro callCommon questions.
Where is SeedCMS's London office?
We have an in-office team in London working alongside our California studio. Combined, that gives us 16 hours of active production coverage per day meaning UK clients get full-day coverage without relying on offshore teams or async-only workflows.
How many Shopify Plus Platinum Partners are there in the UK?
As of 2026, there are only five Shopify Plus Platinum Partners in the UK. SeedCMS is one of them and one of only 27 globally. Platinum is the highest tier in Shopify's partner program, awarded to agencies with sustained high-volume performance across enterprise merchants.
What UK and European brands have you worked with?
Our London team serves UK and European brands across fashion, beauty, CPG, and consumer goods. We also support international brands with UK market expansion including multi-currency, Shopify Markets configuration, VAT compliance, and localised storefront experiences.
Can you handle Shopify Plus migrations from Magento or Salesforce Commerce Cloud?
Yes we've completed over 110 migrations to Shopify Plus, including complex enterprise moves from Magento 2, Adobe Commerce, and Salesforce Commerce Cloud. We manage every layer: data mapping, redirect strategy, integration re-architecture, theme build, and go-live cutover, with a phased approach that protects SEO equity and minimises downtime.
Do you work with B2B Shopify Plus merchants?
Yes. We have deep experience with Shopify Plus B2B including custom pricing, company accounts, net terms, buyer portals, and complex ERP integrations. Shopify's B2B suite has matured significantly and we implement it for brands managing wholesale and DTC from the same platform.
What is the first step to working with SeedCMS in London?
Book a 30-minute intro call through seedcms.com/pages/contact. Our London team will join alongside California where needed. No RFP required just a direct conversation about your project, your timeline, and whether we're the right fit.