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 California
SeedCMS is a Shopify Plus Platinum Partner headquartered in Irvine, California. We've helped California brands including Stüssy, Orgain, Anastasia Beverly Hills, Kate Somerville and Golf Wang build, migrate and scale on Shopify Plus. Our 28+ person in-house team has completed 120+ migrations from Magento, Salesforce Commerce Cloud, WooCommerce and BigCommerce. We work on Pacific time, and our London team extends production to 16 hours a day.
Clients we ship for.
Building ecommerce since 2011 for Consumer Goods, Apparel, Beauty and Entertainment brands, many of them right here in California.
Built tooutrunbigger agencies.
A senior team headquartered in Irvine, deep in Shopify and AI, working at startup speed with the rigor enterprise clients expect.
02
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.
04
Pacific time, plus London
Our Irvine team works your hours. Our London team extends production to 16 hours a day, so launches and fixes don't wait until tomorrow.
What we ship.
Six practices, delivered from our Irvine headquarters by senior in-house teams. Every engagement combines the right mix.
Platform Migrations
Since 2018, SeedCMS has completed 120+ migrations to Shopify Plus, including California brands Kate Somerville (Salesforce Commerce Cloud, under 30 days), Anastasia Beverly Hills (Salesforce Commerce Cloud, 120 days), Stüssy and Orgain (Magento, 90 days) and Golf Wang (BigCommerce, 90 days). We handle data mapping, redirect strategy, integration re-architecture, theme build and go-live cutover, with a phased approach that protects SEO equity and keeps your store selling through launch.
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 with senior people from our Irvine team. No deck, no sales theater. Just your roadmap and an honest answer on whether we're the right fit.
Book an intro callCommon questions.
Why choose SeedCMS for a Shopify Plus migration in California?
SeedCMS is one of 55 Shopify Platinum Partners in the US, headquartered in Irvine, with 120+ migrations completed since 2018. We've moved California brands off Salesforce Commerce Cloud, Magento and BigCommerce, including Kate Somerville in under 30 days and Anastasia Beverly Hills in 120 days, with zero-downtime launches and SEO equity preserved. Every project is run by a senior in-house team, not subcontractors.
Where is SeedCMS located?
Our headquarters is in Irvine, in Orange County, California. We also have an in-house team in London, which gives our clients 16 hours of production coverage a day.
Which California brands has SeedCMS worked with?
California clients include Stüssy and Orgain (both Magento to Shopify Plus), Anastasia Beverly Hills and Kate Somerville (both Salesforce Commerce Cloud to Shopify Plus) and Golf Wang (BigCommerce to Shopify Plus). Full details are on our case studies page.
How long does a Shopify Plus migration take?
It depends on catalog size, integrations and custom features. Our recent California migrations ranged from under 30 days for Kate Somerville to 120 days for Anastasia Beverly Hills. Most mid-market moves from Magento or BigCommerce take around 90 days.
Do you only work with brands in Southern California?
No. We work with brands across California, the rest of the US, Canada, the UK and Australia. Clients near our Irvine office get the benefit of working with a team on the same time zone.
Can you help if we're already on Shopify Plus?
Yes. Most of our ongoing work is with brands already on Shopify Plus who need custom development, CRO, custom apps or a retained senior team. Kith has worked with us for nearly a decade.
How do we get started?
Book a 30-minute intro call through seedcms.com/pages/contact. You'll talk directly with senior people from our Irvine team about your roadmap, timeline and whether we're the right fit.