Magento has always been known for its flexibility. Developers can customize almost every part of the platform through modules, plugins, observers, APIs, and integrations.
But as Adobe Commerce evolves toward cloud-native and composable architecture, there is another important way to build custom functionality:
Adobe App Builder.
Instead of placing every customization directly inside the Magento/Adobe Commerce application, App Builder allows developers to build applications and integrations that run separately from the core commerce platform.
This represents an important architectural change for Adobe Commerce development.
What Is Adobe App Builder?
Adobe App Builder is Adobe’s framework for building cloud-native applications that integrate with Adobe products, including Adobe Commerce.
Developers can use it to build applications using technologies such as:
- Serverless functions
- APIs
- Events
- Webhooks
- Adobe I/O Runtime
- Adobe Commerce APIs
- External APIs and services
Rather than adding large amounts of custom code directly to Adobe Commerce, businesses can move suitable business logic into independent applications.
A simplified architecture might look like:
Adobe Commerce → Events / APIs → App Builder → External Services
This creates a much cleaner separation between the commerce platform and custom business logic.
Traditional Magento Module vs. App Builder
Consider a custom shipping integration.
With the traditional Magento approach, the extension may contain carrier models, API clients, configuration, observers, plugins, cron jobs, database tables, logging and other business logic directly inside Magento.
The more integrations that are added, the more complex the Magento installation can become.
With an App Builder architecture, much of the integration logic can potentially live outside Adobe Commerce.
For example:
Adobe Commerce
Sends shipment or quote information through an API or event.
↓
Adobe App Builder
Processes the request, applies business rules and communicates with external services.
↓
Carrier APIs
FedEx Freight, Estes, R+L Carriers, XPO, TForce or other transportation providers.
↓
Adobe Commerce
Receives the required rates, shipment information or other results.
Adobe Commerce remains focused primarily on commerce.
The integration application handles the integration.
Why This Architecture Matters
1. Less Custom Code Inside Adobe Commerce
Large Magento installations often accumulate dozens of extensions and customizations over many years.
Every customization added directly to Magento can increase the complexity of upgrades, deployments and troubleshooting.
Moving appropriate functionality outside the core application can reduce that dependency.
2. Easier Adobe Commerce Upgrades
One of the biggest challenges with heavily customized Magento installations is upgrading.
A traditional extension can depend on Magento classes, plugins, observers, database structures or internal framework behavior.
When Adobe Commerce changes, those dependencies may need to be reviewed and updated.
An application communicating primarily through stable APIs and events can be more isolated from internal platform changes.
That can make future upgrades considerably easier to manage.
3. Independent Scaling
Imagine an Adobe Commerce store processing thousands of shipping-rate requests.
If all carrier communication happens inside Magento, those requests consume Magento application resources.
With an external application architecture, integration workloads can be processed independently.
This is particularly useful for operations such as:
- Shipping rate calculations
- ERP synchronization
- Inventory updates
- Marketplace integrations
- Order processing
- Product feed generation
- AI services
- Data transformation
- Large asynchronous jobs
4. Better Separation of Responsibilities
A modern commerce platform often communicates with many systems:
Adobe Commerce ↔ ERP
Adobe Commerce ↔ WMS
Adobe Commerce ↔ Shipping Platforms
Adobe Commerce ↔ Marketplaces
Adobe Commerce ↔ CRM
Adobe Commerce ↔ AI Services
Putting every integration directly inside Adobe Commerce can eventually turn the commerce application into the integration layer for the entire business.
App Builder provides an opportunity to separate those responsibilities.
Adobe Commerce can manage the shopping experience, catalog, customers, checkout and orders while external applications handle specialized integration workflows.
App Builder and Event-Driven Commerce
One of the most interesting opportunities is event-driven architecture.
Instead of constantly polling Adobe Commerce to determine whether something changed, applications can respond to events.
For example:
Order Placed
↓
Adobe Commerce Event
↓
App Builder Application
↓
Send order to ERP
↓
Request shipping information
↓
Update another business system
This approach can reduce unnecessary processing while enabling integrations to react quickly to commerce activity.
Does App Builder Replace Magento Extensions?
Not completely.
Traditional Magento modules are still extremely useful.
Some functionality naturally belongs inside Adobe Commerce, particularly when deep interaction with Magento’s frontend, checkout, admin interface or internal business logic is required.
The important architectural question is no longer:
“How do we build this Magento module?”
It should increasingly be:
“Does this functionality need to run inside Adobe Commerce at all?”
If the answer is no, App Builder or another service-based architecture may be a better solution.
In many real-world projects, the best architecture will be hybrid.
A lightweight Adobe Commerce module can handle platform-specific functionality while App Builder handles external APIs, processing and integration logic.
Example: Building an LTL Shipping Application
LTL freight shipping is a good example.
A sophisticated LTL solution may need to communicate with multiple carriers, normalize different API responses, calculate accessorial charges, determine residential delivery requirements, manage credentials, generate BOL documents, track shipments and maintain detailed API logs.
Putting all of that logic inside Adobe Commerce creates a large extension.
A modern architecture could instead use:
Adobe Commerce
↓
Lightweight Commerce Integration
↓
Adobe App Builder
↓
LTL Rating & Shipping Logic
↓
Multiple Carrier APIs
This provides an opportunity to maintain one central shipping application while keeping Adobe Commerce integration much lighter.
It can also make it easier to expand the same backend platform to additional commerce channels in the future.
Preparing for the Next Generation of Adobe Commerce Development
Adobe Commerce development is gradually moving beyond the idea that every customization must be installed directly into Magento.
Developers increasingly need to understand:
- REST and GraphQL APIs
- Webhooks and events
- Serverless applications
- Asynchronous processing
- API-first architecture
- Microservices
- External data storage
- Cloud deployment
- Secure service-to-service communication
Adobe App Builder brings many of these concepts into the Adobe ecosystem.
For Magento developers, this isn’t simply learning another Adobe product.
It is learning a different way to think about commerce architecture.
Final Thoughts
Magento extensions are not disappearing.
But the architecture surrounding them is changing.
For many projects, the future may not be a choice between Magento extensions or Adobe App Builder.
It may be:
Magento Extension + Adobe App Builder + APIs + Events
Each component handles the work it is best suited for.
At EcomPlugins, we are exploring this architecture for the next generation of Adobe Commerce integrations, particularly complex shipping, API and business-system integrations.
The goal is simple: build Adobe Commerce solutions that are easier to maintain, easier to upgrade and better prepared for modern cloud architecture.