Engineering services

A Shopify store that has outgrown off-the-shelf apps and theme limitations.

Shopify development: full service page

We build the custom parts of a Shopify store: apps, Functions, theme engineering and integrations.

Typical work

• Custom Shopify apps, Shopify Functions and theme engineering
• Integrations, performance work and international selling with Shopify Markets

• ProofThree App Store apps built by our founder
• JournalAgency, freelancer or in-house Shopify developer?
• JournalDo you need Shopify Plus? The features that actually require it

A workflow no off-the-shelf app supports, or an app stack that has grown too heavy.

Custom apps: full service page

Custom Shopify apps and app features built around how your store actually works.

Typical work

• A private app for one store’s workflow, in place of several partial apps
• Admin extensions and theme app extensions that fit the existing admin and theme
• Replacing an app that is shutting down or no longer maintained

• ProofThree App Store apps built by our founder
• JournalAgency, freelancer or in-house Shopify developer?
• JournalCheckout UI extensions vs Shopify Functions

Shopify Scripts stopped running on June 30, 2026. Logic that lived there has to be rebuilt.

Shopify Functions: full service page

Discount, delivery and payment logic built as Shopify Functions, running inside Shopify’s own infrastructure.

Typical work

• Rebuilding line-item, shipping and payment Scripts as Functions
• Custom discount rules the built-in discounts can’t express
• Hiding, renaming or reordering delivery and payment options by cart contents

• JournalCheckout UI extensions vs Shopify Functions
• JournalConfiguring Functions with metafields, so rules change without deploys

A theme that limits merchandising, product pages or how the catalog can be browsed.

Theme engineering: full service page

Custom sections, templates and features engineered into your Liquid theme, without rebuilding the store.

Typical work

• Custom sections and templates for products that don’t fit a stock layout
• Metafield and metaobject models so content lives in the admin, not in code
• Collection and navigation structures for large catalogs

• ProofFounder’s work at Transfer Kingdom
• JournalAgency, freelancer or in-house Shopify developer?
• JournalSigns a customized theme is costing you

A store that feels slow, or pages search engines don’t index the way you expect.

Performance and technical SEO: full service page

We engineer for performance from the start, from storefront architecture to the details that affect Core Web Vitals.

Typical work

• Finding what slows the storefront: apps, scripts, images and theme code
• Structured data, canonical tags and crawl paths for large catalogs
• Measuring with field data before and after, so results can be checked

• JournalHow AI assistants see a Shopify store
• JournalSigns a customized theme is costing you

Selling in more countries, currencies or languages from one store.

Shopify Markets: full service page

Setup and theme work for international selling with Shopify Markets, scoped to your markets.

Typical work

• Market, currency and language structure
• Theme changes for localized content and pricing

• JournalOne Shopify store with Markets, or expansion stores?
• JournalSelling in Arabic: right-to-left layout on Shopify

Someone has recommended a headless rebuild, and you want to know whether it pays for itself.

Headless and Hydrogen architecture: full service page

We build on Liquid by default and recommend headless only when it pays for itself. When it does, we plan the Hydrogen architecture.

Typical work

• A written recommendation: theme, headless or a mix, with the trade-offs
• Hydrogen architecture on the Storefront API when headless is the right call

• ProofSnow / Motion: technical showcase, not client work
• JournalMoving a Liquid store to Hydrogen: the checklist
• JournalHosting Hydrogen: Oxygen or self-hosted on Workers

Moving a store to Shopify, or to a new theme, without losing what works.

Migrations: full service page

Scoped case by case, once we have seen the current store and the data involved.

Typical work

• Data, URL and redirect planning
• Theme moves that keep custom features working

• JournalMoving a Liquid store to Hydrogen: the checklist
• JournalMigrating to Shopify: what breaks and how to plan for it

A company website or web application that has to be fast, maintainable and yours, with or without Shopify.

Web development: full service page

Responsive websites and web applications, engineered with modern frontend tooling such as React.

Typical work

• Corporate and marketing websites with content you can update
• Web applications, dashboards and portals on top of your own data and APIs

• ProofSnow / Motion: technical showcase, not client work

A website or web application that should be built, extended or rescued in React or Next.js.

React and Next.js development: full service page

Websites and web applications in React and Next.js with TypeScript, server-rendered where search and speed matter.

Typical work

• Next.js websites that are fast and indexable
• React web applications, dashboards and codebase upgrades

A property website that has outgrown its template: many listings, off-plan projects and leads that must reach an agent fast.

Real estate websites and portals: full service page

Real estate websites and property portals with listing search, project pages, lead capture and CRM integration.

Typical work

• Listing search with filters and maps, and pages for off-plan projects
• Lead capture routed to agents, and CRM or listing feed integrations

Customers ask AI assistants and AI search before they search the classic way, and your site should be understood correctly.

Generative engine optimization (GEO): full service page

Answer-first pages, clear entities, structured data and crawler access, so AI search features can find, understand and cite your site.

Typical work

• Answer-first structure and entity clarity on key pages
• Structured data, crawler access and machine-readable summaries

• JournalHow AI assistants see a Shopify store

An iOS and Android app that needs to share data and logic with your website or store.

Mobile app development: full service page

Cross-platform mobile apps for iOS and Android, backed by APIs, with the technology chosen per project.

Typical work

• A cross-platform app for iOS and Android from one codebase
• The API and integration work an app needs to use your existing data

An iOS and Android app from one codebase, and a clear choice between React Native and Flutter.

React Native and Flutter apps: full service page

Cross-platform apps in React Native or Flutter, with the APIs they need and releases to both app stores.

Typical work

• One codebase for iOS and Android, in the framework that fits your team
• App backends, integrations and App Store and Google Play releases

Important work running in spreadsheets, email threads or tools that no longer fit how you work.

Custom software development: full service page

Internal tools, customer portals, dashboards and business applications built around your process, with the APIs behind them.

Typical work

• Internal tools, admin panels and approval workflows
• Customer and partner portals, booking and quoting systems

Systems that don’t talk to each other: your store, website, app and back office.

Integrations and custom platforms: full service page

APIs and integrations that connect Shopify, your website or app, and the systems your business already runs on.

Typical work

• Syncing orders, inventory or customers with another system through APIs and webhooks
• Replacing manual exports and spreadsheet steps with an automated flow

• JournalCustom app or App Store app: build or install?
• JournalOne Shopify store with Markets, or expansion stores?