A California Shopify Agency for Your Next Commerce Project
SDG is a statewide California Shopify agency and Shopify Platinum Partner, engineering enterprise commerce since 2006. We serve brands across Southern California, the Bay Area, Silicon Valley, the Central Coast, and the rest of the state with one senior design and engineering team. For a Los Angeles-based engagement, work directly with our Los Angeles Shopify agency.
Experience behind the work
Start with the work your store needs
Choosing a California Shopify agency starts with the problem you need it to own.
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For a new build, complex roadmap, or enterprise replatform, explore our Shopify Plus delivery practice. If you are moving from Magento or Adobe Commerce, review our migration scope and cutover approach. If your existing store attracts shoppers but loses them before purchase, start with CRO diagnosis and implementation.
A short note about your store, priorities, and constraints is enough for an initial conversation. Request a project review; a senior member of SDG will follow up to discuss the right next step.
A statewide California Shopify agency since 2006
SDG (Spiegel Design Group) has engineered commerce on Shopify since 2006, longer than almost any agency in California or anywhere.
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Headquartered in the state with a Northern California presence, we have built for some of the most recognized brands in the world while staying rooted in the market we call home.
That tenure matters because Shopify work has changed dramatically: from early theme builds to enterprise Shopify Plus, Hydrogen, Oxygen, B2B, Markets, POS, Checkout Extensibility, Functions, deep ERP/OMS/PIM integration, and now AI-ready commerce. We have grown with the platform rather than arriving after it became obvious.
Enterprise depth for California commerce teams
We are a Shopify Platinum Partner, the platform's highest tier, and a Shopify Build Award winner for our work on Glossier.
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The senior team that scopes your project is the team that builds it, no junior hand-offs. It is the depth behind work like our Barnes & Noble replatform, available to California brands north and south.
For California companies with serious technical requirements, that depth is often the difference between a nice storefront and a commerce system the business can actually run on. We handle the storefront, the migration, the data, the integrations, the analytics, and the operational handoff together.
Shopify delivery across California’s regions
Southern California
We support ecommerce and retail teams across Orange County, San Diego, the Inland Empire, and surrounding markets. For a city-specific office and in-person collaboration, use our dedicated Los Angeles Shopify agency page; this statewide page is for organizations evaluating coverage across California.
Bay Area and Northern California
Our Northern California work supports product-led companies, DTC brands, and enterprise commerce teams across San Francisco, Silicon Valley, Oakland, San Jose, and the wider Bay Area. See our dedicated San Francisco Shopify agency practice.
Statewide and distributed teams
California projects do not need to fit one metro. We run discovery, architecture, design, development, and delivery in Pacific time for teams across the Central Coast, Central Valley, and distributed organizations throughout the state.
Across every region, our full-service scope includes UX/UI, theme and headless development, replatforming and migration, systems integration, SEO, CRO, accessibility, POS, and ongoing support. Explore our Shopify agency overview or full Shopify services.
For California startups, DTC brands, and enterprise retailers
California commerce teams are not all the same. A venture-backed DTC brand may need rapid iteration, CRO, subscription logic, and fast landing-page production.
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A Bay Area company may need a partner comfortable working with product and engineering leadership. A Southern California retailer may need POS, ERP, inventory, and omnichannel operations to behave as one system.
We size the engagement to the actual problem, from a focused feature or audit to a complete Shopify Plus replatform. The common thread is senior engineering, clear ownership, and work that is built to last.
Why work with a California Shopify partner
A California-based partner means real-time collaboration in Pacific time, in-person working sessions when they matter, and a team that understands the operating environment for West Coast product, retail, and ecommerce organizations.
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The reach is anything but local: we deliver for enterprise clients nationally and internationally.
Browse our case studies, our Shopify Plus practice, our migration work, or our Shopify guides.
Frequently asked questions
Are you a California Shopify agency?
Yes. SDG is a statewide California Shopify agency and Shopify Platinum Partner, building on Shopify since 2006 and serving brands across the state and worldwide.
Where do you work in California?
We work statewide, including Southern California, Orange County, San Diego, the Bay Area, Silicon Valley, the Central Coast, and distributed teams across California. Our dedicated city pages provide office and local-practice details.
Do you work with brands in San Diego, Orange County, or the Bay Area?
Yes. We work with California brands statewide, including Orange County, San Diego, San Francisco, Silicon Valley, the Central Coast, and distributed teams across the state, as well as clients nationally and internationally.
What makes SDG different from other California Shopify agencies?
Tenure and depth. We are Shopify’s original enterprise partner, a Shopify Platinum Partner, and a Build Award winner with two decades on the platform, staffed by senior engineers who take on the enterprise builds most agencies decline.
Are you a Shopify Plus agency in California?
Yes. SDG is a Shopify Plus and Platinum Partner based in California, engineering enterprise Shopify Plus builds, replatforms, and integrations for brands across the state.
Do you provide Shopify development in California?
Yes. We provide Shopify development, Shopify Plus development, Hydrogen and Oxygen builds, custom Shopify apps, Checkout Extensibility, Shopify Functions, analytics, and systems integration for California brands.
Do you handle Shopify migrations for California brands?
Yes. We migrate brands to Shopify from Magento, Salesforce Commerce Cloud, Oracle ATG, Adobe Experience Manager, BigCommerce, WooCommerce, and custom platforms, with SEO, data, and integrations planned into the cutover.
Do you take on smaller projects, or only enterprise builds?
Both. We are known for enterprise work, but we size each engagement to the actual scope, from a single feature to a complete replatform. Many California brands start small and grow with us.
Everything your store needs, from one senior team
SDG is a full-service Shopify partner. The same senior engineers and designers behind enterprise replatforms also take on focused projects, ongoing support, and everything in between — for brands large and small. One accountable team, end to end.
Explore all SDG services
Strategy & architecture
Platform evaluation, TCO, roadmaps, and technical architecture grounded in two decades on Shopify.
Explore serviceUX/UI design
Brand-led storefront design and interface work, engineered to convert as well as it looks.
Explore serviceStorefront development
Theme and fully custom front-end builds, from a single template to a complete storefront.
Explore serviceHeadless & composable
Hydrogen, Oxygen, and custom React storefronts engineered to hit performance budgets others miss.
Explore serviceReplatforming & migrations
Moves onto Shopify and Shopify Plus with reconciled data, cutover rehearsals, and recovery planning for complex retail catalogs.
Explore serviceSystems & data integration
ERP, OMS, PIM, CRM, and bespoke middleware — the back-office systems global retail runs on.
Explore servicePerformance engineering
Core Web Vitals, speed, and reliability treated as a baseline, not an afterthought.
Explore serviceShopify SEO
Technical SEO, site architecture, and structured data so the right buyers find your store.
Explore serviceCRO & experimentation
Conversion-rate optimization and A/B testing that turn existing traffic into more revenue.
Explore serviceSupport & retainers
Ongoing monthly support, maintenance, and enhancement — a senior team on call for your store.
Explore serviceAccessibility
WCAG-compliant builds and audits, so your storefront works for every customer.
Explore serviceApps & custom functionality
Custom Shopify apps, checkout extensions, and bespoke features the platform doesn’t ship out of the box.
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