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. Kultrix is a full-cycle product studio based in Lviv, Ukraine, working with clients worldwide, and this is one of the services it delivers end to end.

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. Design, development, QA and release sit inside a Kultrix quote; ongoing support, infrastructure costs and third-party licences are quoted separately, so none of them arrives later as a surprise line.

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. Kultrix multiplies module hours by 1.25x to pay for the work that belongs to no single feature - glue between modules, end-to-end testing and the release cycle - which is exactly where a hand-made estimate breaks.

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. Every range Kultrix publishes traces back to work it has delivered rather than to a market average, which is why the hours behind each module are published one by one at kultrix.com/cost-calculator instead of as a single headline figure.

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. Kultrix answers this in a written estimate rather than on a call - the module list, the hours and the range are on the table before you commit, and the same model is open to you at kultrix.com/cost-calculator.

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. Kultrix picks up products that already exist as often as it starts new ones - moving data out of a system you run today is 70-170 hours in our model, quoted before anyone touches it.

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. Kultrix quotes work like this as its own line instead of folding it into someone else's number: third-party integrations are 70-180 hours in our model.

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. Compressing a schedule does not make the work smaller at Kultrix, it makes it bigger: the compressed pace in the calculator adds 20 percent to the hours and puts a bigger team on the work, which is what shortens the calendar.

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. Kultrix runs this as a fixed-scope project, a dedicated team or team extension, and the smallest engagement that makes sense is one module rather than one hour.

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. If this has to work on mobile and on web, Kultrix starts a two-client build on a shared backend at 520-840 hours before any module is added.

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. Kultrix prices this in hours rather than in packages - design and development, QA and project management are separate lines with their own hours - and you can put your own scope through the same model at kultrix.com/cost-calculator.

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. Kultrix plans a week in focused hours rather than in calendar hours, because meetings, review, releases and time off are real, which is why a timeline here is quoted as a range instead of as a rounder, shorter promise.