Shopify Development Agency — Custom Themes & Apps

Custom development is worth it when your brand needs a unique storefront that off-the-shelf themes cannot achieve, when you need business logic that no app provides, or when performance is a priority. If a theme from the Shopify Theme Store meets your needs, that is often the faster path — Kultrix will tell you honestly.

Hydrogen is Shopify's official React framework for headless storefronts, built on Remix. It gives you complete design freedom, superior Core Web Vitals performance, and full control over the customer experience. Use it when your brand requirements or performance targets exceed what Liquid themes can deliver.

Yes. We build private apps for internal automation (sync inventory, custom discount logic, bulk operations) and public apps listed on the Shopify App Store. We use Shopify's App Bridge, REST and GraphQL Admin APIs, and the embedded app pattern.

Yes, within Shopify's allowed extension points. Shopify Plus merchants have access to checkout.liquid for deeper customization. All merchants can use Checkout UI Extensions for adding custom content, upsell offers, and custom fields post-cart.

We audit theme JavaScript (removing unused libraries, deferring non-critical scripts), lazy-load below-the-fold images, inline critical CSS, use Shopify's image CDN with modern formats, and eliminate render-blocking third-party scripts. Performance improvements directly correlate with conversion rate gains.

Yes. Kultrix handles full platform migrations — products, customer records, order history, and blog content. We use Shopify's import tools combined with custom migration scripts for large catalogs, and configure 301 redirects to preserve your SEO rankings.

Yes. Common integrations include ERP systems (NetSuite, SAP), warehouse management systems, POS (Shopify POS, Square), email platforms (Klaviyo), subscription apps (Recharge), and loyalty programs (Yotpo, LoyaltyLion). We build these via webhooks, APIs, and custom apps.

Shopify Plus unlocks checkout.liquid customization, Shopify Scripts for custom discounts, advanced B2B features, Shopify Flow for automation, and increased API rate limits. Kultrix implements these features to maximize the value of your Plus subscription.

Yes. Shopify Markets handles multi-currency pricing, local payment methods, and geo-based domain routing. We configure Markets with localized content, currency rounding rules, and duty/tax calculations for international checkout compliance.

We configure canonical URLs for collection and product pagination, optimize product and collection page meta templates, implement Product structured data, create an XML sitemap, and set up 301 redirects for any URL changes during theme launches.

Yes. Complex product configurators — 3D viewers, multi-step builders, conditional variant logic — are a common Shopify customization. We build these as embedded JavaScript applications within Shopify themes, using the Storefront API for dynamic pricing and cart updates.

A custom Liquid theme takes 4–8 weeks. A Hydrogen headless storefront takes 8–14 weeks. A custom Shopify app takes 4–10 weeks depending on complexity. Kultrix scopes each engagement with milestones and staging previews throughout.