Adobe Commerce development
Performance & SEO
AI & agentic commerce
Release tracker
Custom Magento extension development for Adobe Commerce 2.4.9
When no existing extension fits your process, we build one: clean Magento 2 modules that follow Adobe’s coding standards and survive the next upgrade.
Describe your extensionWhat’s included- Modules for Open Source and Adobe Commerce
- Breeze, Hyvä and GraphQL compatible
- App Builder apps for Cloud Service stores
Magento extension development means building a custom module when the core and the Marketplace do not cover your process. A good extension uses Magento’s plugins, events and service contracts, ships as a Composer package with tests, and keeps working after the next 2.4.x upgrade.
Anatomy of a well-built module
What you will find in every extension we deliver, and why it is there.
Vendor/Module/
├── registration.php # registers the module with Magento
├── composer.json # versioned package, installed with Composer
├── etc/module.xml # name and load order
├── etc/di.xml # plugins and preferences: no core edits
├── etc/db_schema.xml # declarative database schema
├── Api/ # service contracts other code can rely on
├── Model/ · Plugin/ · Observer/
├── Setup/Patch/Data/ # repeatable data changes
├── view/frontend/ # templates for Breeze, Hyvä or Luma
├── Test/Unit/ # automated tests
└── README.md # install, configure, hand over
What’s included
Checkout & cart logicCustom pricing, shipping, fees and order rules.
Admin toolsGrids, forms, imports and bulk actions for your team.
IntegrationsERP, PIM, shipping and payment connectors.
GraphQL & REST APIsEndpoints for headless frontends and apps.
Frontend compatibilityWorks with Breeze, Hyvä and Luma themes.
Fixes & upgradesThird-party modules repaired for 2.4.9 and PHP 8.5.
Build, buy or configure?
| Your need | Best option |
|---|---|
| Adobe Commerce already does it | Configure the core |
| A Marketplace extension covers most of it | Buy it and extend it |
| Unique business logic | Build a custom module |
| Cloud Service store or isolated logic | Out-of-process App Builder app |
Custom code is the most expensive option to own, so we check the first two before writing any.
Extensions you will not have to rewrite
Upgrade-safePlugins, observers and service contracts instead of core edits, so 2.4.x upgrades do not break them.
Tested and reviewedAutomated tests and checks against the Magento Coding Standard before every release.
DocumentedDelivered as a Composer package with installation, configuration and handover notes.
How we build every module
- No core edits: plugins, observers and preferences only where needed
- Declarative schema and data patches for the database
- Unit and integration tests, plus coding-standard and static-analysis checks
- Versioned Composer package in your repository
- Configuration and handover documentation
Is this right for you?
A good fit if- Your business rule is unique: pricing, fulfilment, approvals or product configuration
- You need a connector to an internal or niche system
- A third-party module broke after an upgrade and the vendor has no fix
- You run Adobe Commerce as a Cloud Service and need App Builder logic
Probably not the right fit if- A Marketplace extension already does 90% of it: buying and extending is cheaper
- The need is temporary or a one-off data change: a script may be enough
What you receive- A short specification you approve first
- A Composer package with version history
- Automated tests and coding-standard report
- Installation, configuration and handover notes
How it works
You see the findings, the scope and the price before any code changes.
- AuditWe review code, extensions, hosting and speed.
Plan & priceA fixed scope and price, or a retainer.
Build on stagingTested on a copy of your store, never live.
Launch & supportA planned release, rollback ready, then monitoring.
Stores we have built
Live projects from our portfolio.
Related guides
In-depth articles from the Mistri blog.
Frequently asked questions
How much does a custom Magento extension cost?
It depends on the scope: a small admin tool is very different from an ERP connector. We write a short specification first and then give you a fixed price.
Who owns the extension code?
The code is written for you and delivered into your own repository, so you can keep using and changing it.
Will the extension work with Hyvä or Breeze themes?
Yes, if we plan for it. We build the frontend parts for the theme you use and test them on that theme.
Can you fix a third-party extension that broke after an upgrade?
Usually. We first check for a vendor update; if there is none, we patch or replace the module and document the change.
What is an App Builder extension?
App Builder runs custom logic outside the Adobe Commerce application and talks to it through APIs and events. It suits Adobe Commerce as a Cloud Service and integrations that should stay separate from the core.
Can you take over an extension another developer wrote?
Yes. We review the code, list the risks and fix or refactor it before adding features.
Do you publish extensions on the Adobe Commerce Marketplace?
We can prepare an extension for Marketplace submission, which has its own technical and marketing review. Most custom extensions stay private to one store.
Related services
Adobe Commerce developmentNew stores, B2B features and integrations on 2.4.9.Learn more →Headless Adobe CommerceGraphQL, API Mesh, Edge Delivery and React frontends.Learn more →Upgrades to 2.4.9Safe upgrades from 2.4.6, 2.4.7 and 2.4.8.Learn more →
Our portfolioAdobe Commerce stores and web projects we have built.See the work →
Need a feature Magento does not have?
Describe what it should do. We will reply with a short specification and a fixed price.