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Shopify Platinum Partner
Top-tier status earned by shipping for top-tier merchants. Headless, OS 2.0, Plus, B2B and Markets.
Shopify Plus Experts, Since 2012
SeedCMS, a specialized Shopify Platinum design and development agency, houses an in-office team of 28+ designers and developers. Specializing in migrations, custom development, AI Integration, CRO and seamless integrations, we prioritize transparent relationships with clients. Our unwavering commitment to excellence, fostered by years of e-commerce insight, ensures meticulous project execution.
Clients we ship for.
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.
03
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.
Seven 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.
Shopify B2B
Shopify's native B2B suite has matured into a serious enterprise tool but getting it right requires more than flipping a switch. Custom buyer portals, company-specific pricing, net payment terms, multi-location account structures, and ERP integrations that don't break under volume. We build the architecture, the custom logic, and the integrations that make Shopify Plus B2B work the way your wholesale operation actually runs.
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.
What makes Seed CMS different from other Shopify agencies?
We're a senior-only team no juniors fronting your account. With Shopify Platinum Partner status, offices in California and London, and 15 years shipping for brands like Kith, Stussy, and Orgain, we combine enterprise-grade rigor with the speed of a focused specialist agency.
What size brands do you typically work with?
We work across mid-market DTC and global enterprise from cult streetwear labels to large-scale consumer goods companies managing high-volume Shopify Plus operations. If you're outgrowing your current setup or need a partner who's done this at scale, we're likely a fit.
Do you only do migrations, or can you help if we're already on Shopify Plus?
Both. We run migrations from Magento, Salesforce Commerce Cloud, WooCommerce, and BigCommerce but the majority of our ongoing work is with brands already on Shopify Plus who need custom development, CRO, app builds, or a retained technical team
How long does a typical project take?
It depends on scope, but we move fast by design. Migrations and custom builds typically go from discovery to launch in weeks, not quarters. For ongoing support, we embed into your team from day one with no ramp-up delays.
Do you work with brands outside of California?
Yes. We have offices in both California and London, which gives us 16 hours of active production coverage per day. We work with brands across the US, UK, and internationally.
What's the first step to working with you?
A 30-minute intro call no deck, no sales theater. Just senior people, your roadmap, and an honest conversation about whether we're the right