Shopify powers 10%+ of all ecommerce. Here’s the developer’s guide: themes, Liquid, apps, and when to go custom.
Shopify Architecture
Shopify is a hosted ecommerce platform with themes (Liquid templating + CSS/JS), apps (built by you or third parties), and an Admin API. The core runs on Shopify’s infrastructure — you don’t manage servers. The tradeoff: you work within Shopify’s constraints. Most stores never outgrow them; a few hit real limits at scale and move to custom headless via Hydrogen or Next.js + Storefront API.
Themes and Liquid
Themes define the storefront appearance. Built with Liquid (Shopify’s templating language), JSON sections for editor controls, and standard HTML/CSS/JS. Shopify’s default Dawn theme is a solid starting point — free, performant, well-supported. Customize by forking Dawn, not by writing from scratch. Learn Liquid — it’s simple but specific. Shopify’s online editor is great for light changes; larger customization needs local dev with Shopify CLI.
Apps: Build or Buy
Shopify’s app ecosystem has 10,000+ apps. For most needs, buy don’t build: reviews (Judge.me, Yotpo), subscriptions (Recharge, Bold), upsells (Zipify, Rebuy), inventory, shipping. Build a custom app only when no existing app does what you need — and even then, start with an embedded app via Shopify CLI. Never build features that fit an existing app’s scope; the maintenance cost will crush your team.
When to Upgrade to Shopify Plus
Standard Shopify handles up to ~$2M annual revenue for most brands. Above that, Shopify Plus ($2,000/mo minimum) unlocks: advanced checkout customization, script-based discount logic (Scripts are dying; replaced by Shopify Functions), multi-store management, wholesale channels, dedicated account management. If you need Checkout Extensibility or process $2M+ revenue, Plus pays for itself.
Hydrogen and Headless Shopify
Hydrogen is Shopify’s Remix-based framework for headless storefronts. Same Shopify backend (products, orders, cart), entirely custom front-end. Performance is excellent. Complexity is much higher than Dawn customization — you maintain hosting, deploy pipelines, front-end features. Only go headless if: you’ve hit theme customization limits, you need a custom brand experience Shopify themes can’t match, or you’re running multi-channel (web + mobile app + kiosks).
Performance Hygiene on Shopify
Biggest Shopify performance killers: too many apps (each loads its own JS), unoptimized hero images, third-party scripts (chat widgets, popups, analytics layers), JavaScript-heavy theme additions. Audit monthly: remove unused apps, compress images, lazy-load anything below the fold. Shopify sites can hit 85+ Lighthouse scores; most don’t because of plugin bloat. Performance is a choice, not a platform limitation.
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