A Shopify Development Agency for Work That Has to Hold
Senior Shopify developers for Liquid themes, custom apps, checkout extensions, Hydrogen storefronts, and the systems behind them. From one difficult feature to an enterprise replatform, the engineers who scope the work are the people who ship it.
Trusted by brands that define their categories
Senior Shopify developers, not a junior pool
Every SDG engagement is built by experienced Shopify developers who have shipped on the platform for years, across some of the largest catalogs and most demanding launches in commerce. The senior people in discovery remain close to the code, architecture, reviews, and launch. You do not spend the first phase explaining the business to one team and the delivery phase teaching it again to another.
That model works for enterprise programs, but it also makes focused work move faster. The person debugging the issue or designing the feature can see the implications across storefront, data, performance, accessibility, and operations without a chain of handoffs.
Shopify theme development and custom storefronts
We design and build custom Shopify themes in Liquid, extend existing themes responsibly, and create reusable sections and components that give merchandising teams control without turning every page into a fragile page-builder experiment. Theme architecture, product data, search, collections, cart, localization, and account behavior are treated as one storefront system.
For an existing store, we can improve a single template, replace a brittle theme, or progressively modernize the codebase while the business keeps trading. Performance budgets, semantic HTML, accessibility, analytics, and SEO are part of the development standard.
Custom apps, extensions, and Shopify Functions
When native Shopify or a proven app fits, we use it. When the requirement creates genuine differentiation or operational leverage, we build it. That includes custom Shopify apps, admin tools, customer account extensions, Checkout Extensibility, POS UI Extensions, Shopify Functions, middleware, workflow automation, and private operational interfaces.
The work starts with ownership and failure modes: where the data lives, who needs to operate it, what happens when a dependency is unavailable, and how the feature will be monitored. That keeps a custom capability from becoming unexplained infrastructure six months later.
Headless Shopify when the case is real
We build headless and composable storefronts on Shopify Hydrogen and Oxygen, as well as custom React architectures when the requirements justify them. We also know when a high-quality Liquid build will be faster to operate, easier to merchandise, and less expensive over its life.
The recommendation is based on content and experience needs, team capability, release model, performance, internationalization, integrations, and total cost of ownership. Barnes & Noble and Society6 demonstrate headless at extraordinary catalog scale; Everlane shows the value of a hybrid architecture that preserves flexibility without rebuilding every Shopify capability.
Enterprise integrations and data engineering
The storefront is only as reliable as the information and operations behind it. Our developers connect Shopify to ERP, OMS, PIM, WMS, CRM, CMS, loyalty, search, payments, tax, analytics, and fulfillment platforms with event handling, reconciliation, observability, and recovery designed in.
Explore our Shopify integration agency practice for platforms including NetSuite, SAP, Microsoft Dynamics, Manhattan Active Omni (MAO), IBM Sterling, Salsify, Sanity, and Contentful.
Takeovers, embedded teams, and ongoing development
We regularly inherit Shopify stores and in-flight builds from internal teams, freelancers, and other agencies. We begin with a technical audit, establish what is stable, isolate the risks, and produce a prioritized path that respects live trading and the existing roadmap. Where needed, we can embed alongside product and engineering teams or take full accountability for delivery.
Engagements range from a focused feature or stabilization sprint to a multi-month build and ongoing retainer. See how the engineering holds up in our Shopify case studies, or explore support and maintenance for a senior team that stays with the store after launch.
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.
Strategy & architecture
Platform evaluation, TCO, roadmaps, and technical architecture grounded in two decades on Shopify.
UX/UI design
Brand-led storefront design and interface work, engineered to convert as well as it looks.
Storefront development
Theme and fully custom front-end builds, from a single template to a complete storefront.
Headless & composable
Hydrogen, Oxygen, and custom React storefronts engineered to hit performance budgets others miss.
Replatforming & migrations
Moves onto Shopify and Shopify Plus without downtime or data loss, including the largest catalogs in retail.
Systems & data integration
ERP, OMS, PIM, CRM, and bespoke middleware — the back-office systems global retail runs on.
Performance engineering
Core Web Vitals, speed, and reliability treated as a baseline, not an afterthought.
Shopify SEO
Technical SEO, site architecture, and structured data so the right buyers find your store.
CRO & experimentation
Conversion-rate optimization and A/B testing that turn existing traffic into more revenue.
Support & retainers
Ongoing monthly support, maintenance, and enhancement — a senior team on call for your store.
Accessibility
WCAG-compliant builds and audits, so your storefront works for every customer.
Apps & custom functionality
Custom Shopify apps, checkout extensions, and bespoke features the platform doesn’t ship out of the box.
Frequently asked questions
What does a Shopify developer do?
A Shopify developer builds and customizes stores on Shopify and Shopify Plus: theme and front-end development, custom apps and checkout extensions, integrations with back-office systems, performance work, and headless builds. SDG covers all of it with senior engineers.
Do you do custom and headless Shopify development?
Yes. We build fully custom storefronts and headless/composable commerce on Hydrogen, Oxygen, and custom React, engineered to hit performance budgets most teams never reach.
Should I hire a freelance Shopify developer or an agency?
A freelancer can be right for a quick fix. For anything mission-critical, a senior team gives you design, development, integration, and support under one roof, with continuity and accountability a single contractor can’t match.
Do you take on small development tasks?
Yes. We size each engagement to the actual work, from a single feature or bug fix to a complete custom build. Many clients start small and keep us on retainer.
What Shopify technologies do you work with?
Liquid, Hydrogen, Oxygen, React, the Shopify Admin and Storefront APIs, custom apps, and integrations with ERP, OMS, PIM and CRM systems.
Do you offer ongoing development support?
Yes. We provide monthly retainers for ongoing development, maintenance, and enhancement long after launch.