E-commerce agency since 2017 · Shopify Partner
We write the code that neither your theme nor the apps in the Shopify App Store have: custom sections and themes in Liquid, custom apps on the Shopify API and headless stores with Hydrogen, for stores that have outgrown their theme. LEADLION, an e-commerce agency in Bucharest since 2017, develops stores on Shopify and Magento 2.
Both are Online Store 2.0 themes, with sections on every page, which your team then edits without code. The difference is where you start: from a Theme Store theme or from scratch.
Option 1
You start from a tested theme and adapt it to your brand and catalogue.
We add the missing sections and blocks and only change the code where the theme editor cannot reach, on a theme copy.
What to know:
A good fit when the theme's structure suits your store.
Option 1 · Theme Store themes, November 2026
The Horizon family: 10 themes at no cost, launched on 21 May 2025 and built on theme blocks.
Dawn, Shopify's older theme, is still listed in the Theme Store.
Bought once, directly from the Theme Store.
Theme choice and design are covered on the Shopify web design page.
To be listed in the Theme Store, a theme needs an average Lighthouse score of at least 60 for performance and 90 for accessibility.
It must also include a Custom Liquid section on all templates with sections and support app blocks on the product page.
Option 2
The structure follows your design and catalogue, not the other way round.
We write the theme in Liquid, with sections, theme blocks and the settings your team changes in the theme editor.
We work within Shopify's limits: 25 sections per template, 50 blocks per section and at most 8 levels of nested blocks.
A good fit when your brand needs a structure of its own.
For each requirement we first look for a suitable app and only write code where one is missing. Our experience with custom code also comes from our 15 in-house Magento 2 modules.
Over 16000 apps (Shopify App Store, November 2026), each put through a 100-point review before publication. Public apps with Shopify Functions work on any plan.
Since 2026 it is built in the Dev Dashboard and installed without App Store approval and without billing through Shopify. It works through the GraphQL Admin API and webhooks, with periodic reconciliation.
Shopify portfolio
We moved Tudor Personal Tailor from Magento 1 to Shopify and worked on the Cosmetology store. Each project has its own page in our portfolio.
Before we start, you receive a specification and a written estimate. After that, the steps depend on what we are building.
Analysis
We work out what can be done in the theme editor, what an app can do and what needs code.
Sections and theme blocks
We write the sections and blocks in Liquid, on a theme copy rather than the published theme, with settings your team changes without code. We also keep a versioned copy of the theme in Git.
Testing
We test every section on the theme copy before publishing.
Publishing
We publish the theme once you approve it and hand over the code and documentation.
Deliverables
the theme or the new sections, plus the code and documentation, which stay yours
App Store or custom
We first look for an app in the Shopify App Store and only write code where one is missing.
Development
We build the app in the Dev Dashboard, on the GraphQL Admin API and webhooks.
Testing
We test the app on a development store before installing it.
Installation
We install it on your store once you approve it. Shopify releases a new API version every three months, and the updates are part of maintenance.
Deliverables
the app installed on your store, plus the code and documentation, which stay yours
Searched the Shopify App Store and no app does exactly what you need? We build it for your store. The code stays yours, and the app does not appear in the App Store.
What is a custom app?
An app built only for your store, in the Dev Dashboard. According to Shopify, it is installed without App Store approval and without billing through Shopify.
Your own discount, delivery or payment rules
Shopify Functions
In a custom app, only on Shopify Plus; on the other plans, through a public app from the App Store.
Data synchronised with another system
GraphQL Admin API and webhooks
Webhooks announce the changes, and a periodic reconciliation catches whatever did not arrive: Shopify does not guarantee their delivery.
A new block after the order is placed
Checkout UI extension
On the Thank you and Order status pages it works from the Basic plan; in the checkout steps, only on Shopify Plus.
In short: we only write code where no suitable app exists.
Two big decisions, which we only recommend when themes and apps are no longer enough.
The Shopify Plus plan
When you need a fully customised checkout, custom functions or several stores. Since April 2026, B2B with up to 3 catalogues also works on Basic, Grow and Advanced, so it no longer requires Plus.
Headless
Only when themes and apps do not cover what you need: according to Shopify, a headless storefront costs more to build and maintain than a theme.
A chosen and customised theme or a custom design, built around your brand
View detailsFrom WooCommerce, Magento, PrestaShop or any other platform
View detailsInvoicing, couriers, payments, marketplaces and ERP
View detailsWork per task or on a monthly subscription, after launch
View detailsTurnkey Shopify stores: design, configuration and integrations
View detailsNew stores on Magento Open Source and Adobe Commerce
View detailsTell us which platform and plan you are on and which feature is missing. We will come back with questions and a written estimate.
