Shopify development company work should give you a store that behaves exactly the way your business does, not a template stretched to fit. CIT is a Vietnam-based team building custom Shopify themes, private apps, Shopify Plus checkouts and headless storefronts for merchants in the US, Singapore and beyond, with full source-code handover on every project.
Most brands do not need another agency that installs a paid theme, wires up three apps from the App Store and calls it a launch. They need engineers who understand Liquid, the Admin and Storefront GraphQL APIs, checkout extensibility and the trade-offs between a themed store and a headless build. That is the kind of Shopify development services partner CIT set out to be when we started in 2015, and it is why this page talks about architecture and code rather than logos.
What a Shopify development company actually builds for you
Shopify is deceptively simple on the surface and genuinely deep underneath. A merchant can open a store in an afternoon; a scaled operation running thousands of SKUs across multiple markets, subscription billing, ERP-synced inventory and a custom checkout is an engineering project. As a Shopify development company we spend most of our time in that second world, where the platform’s flexibility has to be shaped by people who know exactly where its boundaries are.
On a typical engagement we build custom themes in Liquid against the Online Store 2.0 architecture, private and custom apps against the Admin and Storefront APIs, checkout extensions and Shopify Functions on Plus, and full headless storefronts on Hydrogen when the front end has to move independently of the platform. Around that core we handle data migration, third-party integrations, conversion and performance work, and long-term maintenance. Each of those is a discipline in its own right, and the sections below go through them one at a time.
Custom Shopify theme development in Liquid
The theme is where most merchant value is won or lost, because it is the layer your customers actually touch. We build themes from the ground up in Liquid using the Online Store 2.0 model: JSON templates, sections available on every page rather than just the home page, app blocks, and metafields and metaobjects that let non-technical staff manage structured content without editing code. That last point matters more than it sounds. A theme built the 2.0 way lets your merchandising team assemble landing pages, size guides, ingredient panels or spec tables from the theme editor, while the underlying markup, schema and performance budget stay under engineering control.
We keep themes lean on purpose. Render-blocking scripts, oversized hero images and a stack of half-used apps are the usual reasons a Shopify store feels slow, and we treat Core Web Vitals as a build requirement rather than an afterthought. Lazy-loaded imagery, deferred non-critical JavaScript, responsive srcset handling and disciplined use of the section-rendering API keep Largest Contentful Paint and Cumulative Layout Shift in healthy territory on real mobile hardware.
Custom Shopify app development
When a merchant’s requirement cannot be met by the theme or by an off-the-shelf listing, the answer is a custom app. We build both private apps scoped to a single store and public-style custom apps against the Shopify Admin API, using GraphQL where it earns its keep for efficient, batched reads and writes, and REST where a workflow calls for it. On the buyer-facing side we use the Storefront API to power custom cart logic, product configurators and bespoke account areas.
Our app work follows Shopify’s own conventions so the result feels native rather than bolted on. That means embedded admin interfaces built with App Bridge and the Polaris design system, OAuth handled correctly, webhooks for order, product and inventory events, and background jobs that respect API rate limits and the cost-based throttling on the GraphQL endpoint. Whether the app is a warehouse sync, a loyalty engine, a quoting tool for B2B buyers or a subscription manager, it is built to survive Shopify’s platform updates and to hand over cleanly to your team.
Store migration, setup and re-platforming
A large share of the work a Shopify development company takes on is migration: moving a merchant off Magento, WooCommerce, BigCommerce or a legacy custom cart onto Shopify or Shopify Plus. The visible part is the theme; the risky part is the data. We map and migrate products, variants, collections, customers, historical orders and, critically, URLs, so that hard-won organic rankings survive the move behind correct 301 redirects. We reconcile inventory, re-map tax and shipping logic, and run the new store in parallel until the numbers match before anyone flips DNS.
Why Shopify, and when it is the right choice
We are not dogmatic about the platform. Part of being an honest Shopify development company is telling a prospect when Shopify is not the best home for their business, and occasionally pointing them toward a different stack. But for the large majority of direct-to-consumer and B2B commerce operations, Shopify wins on the things that quietly cost the most elsewhere: hosting, security, PCI compliance and the checkout are the platform’s problem, not yours.
Shopify fits well when you sell physical or digital goods and want to move fast without running your own infrastructure, when you need a checkout that converts and stays compliant without a dedicated payments team, and when you value a mature ecosystem of apps and integrations you can lean on. It fits especially well when paired with engineers who can extend it, because the ceiling on a well-built Shopify store is far higher than most merchants realise.
Shopify versus a fully custom e-commerce build
The alternative is building your own commerce platform, or adopting a composable stack of separate services for catalog, cart, checkout and payments. That path buys total control and unlimited flexibility, at the cost of owning every piece of security, scaling and maintenance yourself. It makes sense for a handful of businesses with genuinely unusual commercial models or extreme scale. For everyone else, the honest maths favours Shopify plus targeted custom development: you get most of the flexibility of a bespoke build for a fraction of the cost and risk, because the platform absorbs the undifferentiated heavy lifting. When a merchant does need a custom application layer around commerce, our broader e-commerce app development practice covers ground that sits outside Shopify’s remit.
Our Shopify development services in detail
The phrase Shopify development services covers a wide range, so here is what we mean by it concretely. Every engagement is scoped from your actual requirements rather than a fixed package, but these are the building blocks we assemble from.
Front-end and theme engineering
Custom themes built in Liquid, migration of existing themes to the Online Store 2.0 structure, section and block development, metafield and metaobject architecture for structured content, and theme-app-extension work so your custom features live cleanly inside a merchant-editable theme. We also take over and stabilise inherited themes that have accumulated technical debt, refactoring them without a full rebuild where that is the sensible call.
Back-end, apps and automation
Custom Admin API apps, Storefront API integrations, webhook-driven automation, and internal tools that connect Shopify to the rest of your operation. We build the unglamorous but decisive things: bulk-operation jobs that sync tens of thousands of products against the GraphQL Bulk Operations API, inventory reconciliation across multiple locations, and Shopify Flow automations extended with custom connectors where the standard triggers stop short.
Conversion rate optimisation and performance
Speed and conversion are engineering outcomes, not marketing slogans. We instrument your store, find the friction, and fix it in the code: streamlining the cart and pre-checkout flow, tightening the mobile experience, cutting the app bloat that drags down load times, and structuring product and collection pages so they rank and convert. Where you are on Shopify Plus, we extend that work all the way into the checkout itself.
Maintenance, support and retainers
A store is never finished. We offer ongoing retainers that cover monitoring, security and dependency updates, bug fixes, small feature work and the seasonal readiness that matters when a single hour of downtime during a peak sale is expensive. Retainers are sized to the store; a lean single-market shop and a multi-region Plus operation need very different levels of attention, and we scope accordingly rather than selling a one-size block of hours.
Shopify Plus and headless commerce
The most technically interesting work an experienced Shopify development company does happens at the Plus tier and in headless architectures, because that is where the platform opens up its deepest extension points.
Checkout extensibility and Shopify Functions
Shopify Plus merchants now build on checkout extensibility rather than the deprecated checkout.liquid and the old Shopify Scripts model. We build Checkout UI extensions that add fields, messaging, upsells and custom validation at the exact points in the flow where they lift conversion or reduce failed orders, all inside Shopify’s secure, upgrade-safe checkout. Alongside them we write Shopify Functions in Rust or JavaScript to customise discounts, shipping and payment method logic, cart transforms and delivery customisations at the platform level, so complex promotional and B2B pricing rules run reliably rather than living in fragile client-side code.
B2B, wholesale and multi-market
Shopify’s native B2B features, company accounts, catalogs, price lists and net-payment terms, have matured to the point where a serious wholesale operation can run on Plus without a separate portal. We configure and extend that B2B layer, and combine it with Shopify Markets for multi-currency, multi-language and market-specific catalogs so a single store can serve buyers in the US, Singapore, Europe and beyond from one operational core.
Headless commerce with Hydrogen and the Storefront API
Headless is the right answer when your front end needs to move faster than the theme layer allows, when you are unifying commerce with heavy editorial content, or when you want a React-based experience with app-like interactivity. We build headless storefronts on Hydrogen, Shopify’s React framework, deployed on Oxygen, consuming the Storefront API for products, cart and checkout. We are candid about the trade: headless gives you enormous front-end freedom but moves responsibility for performance, previews and the editing experience onto your build, so we only recommend it when the business case is real rather than because it is fashionable.
Third-party integrations that hold together
A Shopify store almost never operates alone. It sits in the middle of a system that includes an ERP, an accounting package, a warehouse or third-party logistics provider, one or more payment methods, a shipping stack and a marketing platform. Integration is where many otherwise good stores quietly break, and it is a core part of what a capable Shopify development company delivers.
ERP and back-office
We connect Shopify to ERP and back-office systems, from NetSuite and Microsoft Dynamics down to regional accounting tools, so orders, inventory, customers and fulfilment status stay in sync without manual re-keying. The right pattern depends on volume and tolerance for latency: near-real-time webhook-driven syncs for order flow, scheduled batch jobs reconciled against the Bulk Operations API for large catalog and inventory updates, and idempotent handling so a retried message never double-counts stock or duplicates an order.
Payment, shipping and logistics
Beyond the standard gateways, we integrate regional and alternative payment methods, buy-now-pay-later providers and, on Plus, additional payment logic through Functions. On the fulfilment side we wire up carriers, rate-at-checkout services, 3PL and warehouse-management systems, and returns platforms, so the promise made at checkout matches what actually happens in the warehouse.
Marketing, CRM and analytics
We connect email and SMS platforms, CRM systems, customer-data platforms and analytics with correct, consented event tracking, including server-side tagging where privacy rules and data quality demand it. The goal is a single, trustworthy view of the customer that marketing can act on without engineers manually exporting spreadsheets every week.
Industries we build Shopify stores for
Because CIT has worked across many sectors since 2015, we bring pattern recognition rather than a single playbook to each build. We have delivered Shopify and broader commerce work for fashion and apparel brands with heavy variant matrices, for health, beauty and supplement merchants with subscription and compliance needs, for food and beverage sellers managing perishable inventory and delivery windows, and for industrial and B2B distributors whose catalogs and pricing rules break most template stores.
The through-line is that each industry stresses a different part of the platform. Fashion pushes on variants, merchandising and returns; supplements push on subscriptions and regulatory content; industrial B2B pushes on price lists, quoting and ERP integration. A Shopify development company that has seen these patterns before spends its budget solving your specific problem instead of relearning the platform on your time.
Engagement models that fit how you work
Different organisations buy development differently, and forcing everyone into one contract shape helps no one. We offer three broad models and adapt within them.
Fixed-scope projects suit a well-defined build with a clear finish line, such as a theme rebuild, a migration or a specific app, where you want a firm scope, timeline and budget. Dedicated team engagements suit an ongoing roadmap where you want a stable, ring-fenced group of engineers who learn your business deeply and ship continuously against your priorities. Retainer and support arrangements suit merchants whose store is live and needs reliable maintenance and a steady stream of small-to-medium enhancements.
The right model depends on how defined your work is and how much you want to steer week to week. If what you actually need is to add named specialists to a team you already run, that is a staffing question rather than a project one, and our hire Shopify developers page covers that model directly; this page is about scoped Shopify development services where we own delivery.
How our Shopify development process runs
Good outcomes come from a process that surfaces problems early, when they are cheap to fix, rather than at launch when they are not.
Discovery and technical scoping
We start by understanding the commercial model, the current stack, the integration surface and the constraints, then translate that into a technical scope: what gets built as theme, what needs a custom app, what integrates with what, and where the genuine risks are. You get a clear picture of architecture and effort before committing to a full build.
Design, build and iterative review
We work in short, visible increments against a shared backlog, with a staging store you can see progress on rather than a black box that opens on launch day. An English-speaking project manager owns communication, runs the reviews, and keeps the work aligned to your priorities across the time-zone gap, so distance never becomes an excuse for surprises.
Quality assurance and launch
Before launch we test across devices and real-world scenarios: checkout paths, discount and tax edge cases, integration failure modes, and performance under load. Migrations run in parallel with reconciled data until the numbers agree. Launch is a planned, low-drama event with redirects in place and a rollback path ready, not a leap of faith.
Handover, support and ownership
At the end you receive the full, documented source code, and it is genuinely yours. Full source-code handover has been our standard since 2015, which means you are never hostage to a proprietary layer or a locked repository. If you continue with us on a retainer, we support what we built; if you take it in-house or to another team, everything they need goes with the code.
Why choose CIT as your offshore Shopify partner
There is no shortage of agencies that can install a theme. The reasons to choose CIT as your Shopify development company are narrower and more concrete than a list of services.
Real cost efficiency. Offshore delivery from Vietnam typically lands well below equivalent onshore US or Singapore rates while holding senior engineering quality, and merchants commonly see meaningful savings against local agency pricing. The exact figure depends on scope, seniority mix and how much ongoing work you carry, so we quote against your actual project rather than a headline promise, but cost is a genuine and durable advantage, not a one-off discount.
Communication built for distance. Every engagement runs through an English-speaking project manager and works in overlapping hours you can rely on. Offshore development fails when it becomes a black box; we run it the opposite way, with visible progress, direct access to the people writing the code, and no layers of account management standing between you and the work.
You own the source code. Full handover is the default. That single policy removes the lock-in that quietly traps merchants with other vendors and keeps the balance of power where it belongs, with you.
A decade of multi-industry delivery. Working since 2015 out of Ho Chi Minh City and Dong Nai, across many sectors and technology stacks, means we bring hard-won judgement about what breaks in production and how to build so it does not. That experience extends beyond Shopify: when a project needs a content-driven site instead, our WordPress development services cover that ground, and clients who want the wider picture on delivery from Vietnam can read our overview of software outsourcing in Vietnam. For the broader engagement and governance model behind all of it, our guide to software development outsourcing lays out how we structure long-term partnerships.
Frequently asked questions about our Shopify development services
How much does it cost to work with a Shopify development company like CIT?
Cost depends heavily on scope. A focused theme customisation, a full custom theme build, a migration, a custom app and a headless storefront are very different sizes of work, and pricing scales with complexity, integration count and seniority. As an offshore team we generally price well below onshore US or Singapore agencies for comparable quality, and we scope and quote against your specific requirements so the number reflects your build rather than an average. We are happy to give an indicative range early once we understand what you need.
Do we get the source code, or are we locked into your platform?
You get the complete source code, documented, with full handover. This has been our standard since 2015. There is no proprietary layer you cannot leave and no locked repository. Whether you stay with us for ongoing support or move the work in-house or elsewhere, the code and its documentation belong to you.
Can you build on Shopify Plus, including custom checkout logic?
Yes. We build on Plus using the current checkout extensibility model, Checkout UI extensions and Shopify Functions in Rust or JavaScript, rather than the deprecated Scripts and checkout.liquid approach. That covers custom discounts, shipping and payment logic, cart transforms, and B2B pricing and company-account configuration, all inside Shopify’s secure, upgrade-safe checkout.
Should we go headless with Hydrogen, or stay on a themed store?
It depends on the business case. A well-built Online Store 2.0 theme serves most merchants extremely well and is cheaper to build and run. Headless with Hydrogen makes sense when you need front-end freedom the theme layer cannot give, are unifying commerce with heavy content, or want a React-driven, app-like experience. We will tell you honestly which side of that line you fall on rather than defaulting to the more expensive option.
How do you handle time zones and communication with US and Singapore clients?
Every project has an English-speaking project manager who owns communication and runs regular reviews against a shared, visible backlog and staging store. We commit to overlapping working hours and direct access to the engineers building your store. The distance is a cost advantage we manage deliberately, not a barrier we ask you to absorb.
Talk to a Shopify development company that hands you the code
If you are weighing a new store, a migration, a Plus checkout project or a headless build, the useful next step is a conversation about your actual requirements, not a sales pitch. Tell us what you sell, what your current stack looks like and where it hurts, and we will come back with a clear technical view of what to build, roughly what it takes, and whether Shopify is even the right home for it. As a Shopify development company that has shipped across many industries since 2015 and hands over full source code on every project, CIT would rather earn the work by being straight with you than by overselling it. When you are ready, reach out and let us scope your Shopify build together.
