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Ecommerce architecture:
key options & selection guide
February 26, 2026
Ecommerce architecture means the overall structure of an ecommerce solution. It defines how various components of the software are arranged, how they interact with one another, and how data moves between the solution and external services to enable online buying and selling.
The architecture of the online store directly affects its performance, scalability, security, and
maintainability. These aspects determine whether the solution efficiently supports ecommerce operations,
provides high-quality shopping experiences for customers, and can adapt when the business needs change.
The architecture of a particular ecommerce solution depends heavily on the architectural approach it
follows, with bespoke, platform-based, SaaS-based, and composable being the main options. These architectural
approaches give retailers different levels of freedom and flexibility in choosing the structure,
frontend-backend relationship, and deployment models for their digital stores.
With multiple system
design variants available, retailers need to make several important choices about the software foundation and
the level of architectural freedom they need. These decisions will help them create a store in line with their
business needs and goals. Providing ecommerce development services for over 25 years, Itransition helps retailers choose the right approach to building ecommerce solutions and
implement high-performing, user-friendly, and secure online stores.
Types of architectural approaches in ecommerce solutions
Bespoke ecommerce solutions
Bespoke ecommerce solutions are developed from the ground up to align with unique requirements and commerce workflows of the retailer. In this type of ecommerce applications, every feature, user flow, integration, and business rule can be designed exactly as the company needs it. Therefore, retailers are not limited in their functionality or technology choices and can create a fully tailored online store.
Advantages
- High architectural freedom that allows to fully tailor solutions to the retailer’s business needs and growth plans
- Complete control over the solution and its evolution
- No risk of vendor lock-in
Limitations
- Longer time-to-market compared to solutions built on top of off-the-shelf platforms
- High upfront costs
Best for retailers that
- Want full control over their online store
- Have unique or highly complex business requirements that can’t be met with pre-built solutions
Platform-based ecommerce solutions
In contrast to bespoke ecommerce apps that are developed from scratch, platform-based solutions are built on ready-made ecommerce platforms like Adobe Commerce (Magento) or SAP Commerce (formerly Hybris). Businesses can configure and customize such platforms to meet their specific ecommerce needs. In most cases, the core architecture in a platform is standardized and fixed, so businesses can only partially adjust its functionality. This also means that to reshape the platform’s core services, data models, and business logic, retailers may need to invest significant efforts that are often unjustified.
Advantages
- Faster time-to-market and lower cost of initial implementation compared to bespoke solutions
- Reduced maintenance burden for ecommerce businesses since bug fixes, security updates, and functional upgrades are handled by platform vendors
- Easy integration with other systems due to the availability of pre-built APIs or connectors
- The availability of multiple deployment options (cloud, on-premises, or hybrid)
Limitations
- Limited flexibility in adjusting the platform’s core functionality or customizing workflows beyond a certain extent
- Typically higher ongoing costs due to platform licensing and subscription fees
- Dependency on the vendor updates, feature roadmap, and pricing policies
Best for retailers that
- Seek to lower development time and costs
- Prioritize time-to-market over unique experiences
SaaS-based ecommerce solutions
Similarly to the platform-based model, Software-as-a-Service (SaaS) ecommerce involves the implementation of ready-to-use solutions provided as cloud-based SaaS platforms that offer sets of pre-built features on a monthly or annual subscription basis (e.g., Shopify, Agentforce Commerce, SAP Commerce Cloud, and Adobe Commerce as a Cloud Service). However, SaaS platforms typically offer fewer customization options than the software products in the platform-based model. Such customizations are largely limited to configurations within predefined templates, themes, and extensions from official marketplaces. The vendor fully manages the SaaS platform, taking care of its hosting, infrastructure, maintenance, security patching, and functional updates. As a result, the flexibility of the SaaS platform’s architecture and deployment options is very limited.
Advantages
- Fast time-to-market due to the availability of a pre-built ecommerce platform with ready-to-use features
- Centralized platform updates from the vendor with limited post-update configuration and testing required for the business
- Easy scaling of the ecommerce solution ensured by the SaaS platform’s infrastructure
- Minimal software maintenance burden for retailers
Limitations
- Limited customization options that don’t allow retailers to create unique user experiences or support complex ecommerce workflows
- Higher ongoing costs because of subscription fees
- Lack of control over the platform’s functionality and infrastructure, which can make it harder for businesses to implement desired enhancements or quickly address operational issues
- No on-premises deployment option
Best for retailers that
- Prioritize fast time-to-market with minimal development effort
- Seek to minimize their software maintenance efforts
Composable commerce solutions
Composable architecture is the least common ecommerce development approach that involves a tailored ecommerce solution assembled from existing components, such as software products or online platforms, from different vendors instead of components from a single platform. Retailers can add, combine, and replace independent components as needed to quickly respond to market changes and customer demands. In composable solutions, each microservice handles specific functionality, such as a product catalog, shopping cart, and payment gateway, and is connected to others using API calls, message brokers, data flows, or service buses that ensure seamless integration across all modules. The flexibility and agility of composable commerce solutions allow businesses to quickly create unique customer experiences and experiment with new technologies, which makes them a perfect fit for businesses with dynamically evolving needs.
Advantages
- Greater flexibility and agility of the ecommerce solution
- Fast time-to-market due to availability of ready-made components
- High on-demand scalability of pre-made components
- Easy access to innovative technologies
- Suitability for existing infrastructures where some components are already in place
Limitations
- Highly complex implementation because of the need to integrate multiple independent components from different vendors and set up data flows
- Potential maintenance challenges as each component has its own APIs and dependencies and requires separate updates
Best for retailers that
- Operate as global, multibranch companies where different business units across regions use different systems
- Need to build an online store on top of existing infrastructure where several components are already available
- Seek to use the most suitable or best-in-class components for specific tasks
Need help building a tailored ecommerce solution?
Key ecommerce architecture options
By structure
Monolithic architecture refers to a traditional approach to developing ecommerce systems in which all
their components are built and deployed as one cohesive unit. The app’s user interface, business logic,
and data access layers are created within a single codebase, which makes them tightly interconnected. All
app layers share the same resources, which can limit scalability for larger apps.
To address
these scalability issues, developers can divide the traditional monolith system into a set of smaller,
loosely coupled software modules, each responsible for a separate aspect of the app’s functionality (like
product catalog, checkout, or inventory management). While modular ecommerce applications remain a single
deployment unit, modules within them are developed, tested, and maintained separately. This allows
companies to add, scale, or replace components, quickly adapting the solution to evolving business needs
and customer expectations.
While the monolithic design pattern can be less scalable than
distributed systems, it is still the most popular option for building small and medium-size online stores
and ensuring their low technical overhead.
Advantages
- Simplicity in initial development, testing, deployment, and maintenance since there is only one codebase
- Faster time-to-market due to a straightforward and predictable development process
- High performance since all app parts were built together and communicate directly
Limitations
- Limited flexibility in introducing new features to the solution or scaling it, since changes to one component often require modifying and redeploying the entire application
- Switching to new technologies is challenging once the system has been implemented
- High risk of cascading failures, with one issue potentially affecting the whole ecommerce solution
Best for
- Small to mid-size ecommerce solutions with conventional ecommerce workflows
Scheme title: Example of monolithic architecture for a web-based ecommerce application
In a microservices-based solution, the architecture is built from loosely coupled services called microservices. Each microservice handles separate functionality, such as product catalog management, user management, order processing, and inventory control. Each microservice is deployed independently of the others and operates as a standalone subsystem that has its own business logic and internal architecture and communicates with other services via APIs. Allowing for more flexibility, this architectural design pattern enables developers to upgrade and scale individual components so that the other parts of the ecommerce solution remain unaffected. All this makes the microservices approach well suited for ecommerce solutions that will be frequently improved and updated to match changes in business needs.
Advantages
- Easy and quick to update and scale, since you can modify only specific modules instead of the entire solution
- Different modules can be built using various technology sets
- High overall resilience of the solution due to fault isolation within individual modules
- Simplified integration with other solutions because of loose coupling of the modules and standardized protocols for communication between them
Limitations
- Complex development, implementation, and maintenance due to the distributed nature and independence of each module
- Increased latency and potentially lower performance of the solution due to communication overhead between the modules
- Higher project management and coordination overhead if multiple teams are engaged in development
- Potential security risks since multiple independent modules expand the attack surface
Best for
- Large online stores or marketplaces that require high scalability, frequent updates, and complex delivery approaches (e.g., different modules are developed by different teams or vendors)
Scheme title: Example of microservices architecture for an ecommerce platform
By frontend-backend relationship
In a coupled ecommerce solution, the presentation layer, or the frontend, responsible for displaying user interfaces, is tightly integrated with the backend that handles business logic and data storage. This means that both layers are developed and managed as a single system, so changes in one layer require corresponding changes in the other. Coupled ecommerce solutions are simple to build, so they can be an optimal choice for businesses that need a simple online store with a single storefront to support basic commerce workflows.
Advantages
- Simple development and deployment
- Easy to maintain since troubleshooting and updates can be performed centrally, without the need to coordinate across separate modules
Limitations
- Limited flexibility in changing or scaling the app, since frontend and backend must be updated together
- Limited support for multichannel commerce since adapting the storefront to web or mobile requires significant modifications and often results in duplicated development efforts for each channel
Best for
- Ecommerce store with a single storefront
Developing a headless ecommerce solution involves the separation of its frontend and backend layers and enabling communication between them via APIs created from scratch for bespoke solutions or provided out-of-the-box by platforms. Such decoupling enables businesses to create separate user interfaces for a wide range of different commerce channels (like web, mobile, social media, etc.) while using the same backend to ensure tailored ecommerce customer experiences across various touchpoints. With multiple tailored storefronts, retailers can adapt their commercial offering to the needs of various audiences, deliver consistent yet highly personalized customer journeys across all channels, and experiment with new customer-facing experiences without disrupting their business operations.
Advantages
- Ease of updating and scaling one layer without affecting others
- Easy integration with multiple frontends or external services via standardized APIs
- Omnichannel commerce support
Limitations
- Complex to implement, manage, and maintain
- Higher maintenance costs
Best for
- Online stores that target a wide range of audiences across different commerce channels
Scheme title: Example of headless architecture for an ecommerce platform
By deployment model
Ecommerce companies can opt for an online shopping solution that can be hosted in any environment, be it cloud, on-premises, or hybrid. Such a solution is not tied to the specifics of the underlying hosting infrastructure and can be moved to different environments with no or minimal changes to the code or configurations. To build such a solution, developers make a conscious decision to avoid using managed services and other vendor-dependent components focusing on widely adopted, standardized protocols, frameworks, and infrastructure components, usually available as open-source solutions. This allows the reduction of platform-specific dependencies and ensures app compatibility and portability across environments.
Advantages
- Flexibility in choosing the best deployment option based on business needs
- Prevention of vendor lock-in
Limitations
- More complex app optimization capabilities on certain hosting platforms that can lead to performance inefficiencies
- Limited possibility to use advanced built-in features of a specific cloud platform
- Complex maintenance due to multiple self-hosted infrastructure components
- Higher upfront infrastructure costs due to the need to reserve capacities for handling workload spikes, which stay underutilized outside peak periods
Best for
- Ecommerce stores that require flexibility in hosting and deployment due to operational or strategic considerations
Companies can design and develop their online stores to operate on a specific cloud platform to get access to its unique features, tools, and regional capabilities and achieve optimal app performance, reliability, and infrastructure costs. Hosting ecommerce applications in the cloud allows companies to scale computing resources and storage on demand, ensuring the solution’s high performance and availability even during traffic surges (e.g., during seasonal sales), and simplifies the delivery of upgrades or new features.
Advantages
- Excellent scalability due to elastic cloud infrastructure that can automatically adjust to traffic fluctuations
- High uptime due to deployment of the app across multiple availability zones or regions as well as load balancing and automated failover most cloud providers offer
Limitations
- Limited control over the underlying infrastructure and reliance on the provider for its maintenance, upgrades, and security patching
- Risk of vendor lock-in because of the dependency on the cloud platform’s proprietary services, APIs, and configurations
Best for
- Online stores with episodic traffic spikes
- Online stores that operate around the clock and/or across different countries
- Ecommerce solutions whose downtime can cause significant revenue loss and brand reputation damage
- Companies that want to avoid the complexity of maintaining their ecommerce store’s infrastructure
Build a robust ecommerce platform with Itransition
Ecommerce architecture options at a glance
Architectural approach | Architecture options by | ||
|---|---|---|---|
| Structure | Front / backend relationship | Deployment | |
Bespoke | Any | Any | Any |
Platform-based | Mostly predefined, fixed | Depends on the platform | Any |
SaaS | Predefined, fixed | Limited by templates, themes, and available extensions | Cloud-native |
Composable | Modular | Can differ from component to component | Any, often mixed |
How to choose & adopt a suitable ecommerce architecture approach
The software’s architectural design pattern depends primarily on what architectural approach you select for your future ecommerce solution based on your company’s specific business needs and strategic goals. Here’s a list of key steps that companies usually take to decide on the most appropriate architectural configuration for your case and effectively adopt it.
1
Business goals analysis
Start by analyzing your business context and clearly defining business objectives and long-term goals you plan to achieve with a new ecommerce solution, like expanding to new markets, adopting new sales channels, or providing personalized customer experiences. As part of this step, consider business aspects like the geographic scope of ecommerce operations (regional or global), expected data volumes (e.g., the number of SKUs, product images, and customer data), online store availability (24/7/365 or limited operating hours), and the need to integrate with external services (e.g., tools for tracking inventory or shipping). These factors and constraints will help you clearly understand your priorities and align all subsequent technical decisions with them.
2
Software requirements definition
Next, evaluate your current digital maturity to understand how well your existing software ecosystem, business processes, and technology stack can support your goals. Based on the results, you can outline the features and integrations the new solution should support and determine the non-functional aspects of your future ecommerce solution, including its performance, security, reliability, and scalability requirements.
3
Selection of the optimal architectural approach
Having a clear understanding of your business needs and software requirements, you can start evaluating
which architectural approach best fits them.
For example, a small retailer planning to launch a
boutique online store with exclusive product lines, low expected traffic, and minimal integration with other
tools can opt for a SaaS-based solution. This option will allow the company to set up the online store
quickly, minimize development and maintenance costs, and focus on sales instead of managing IT
infrastructure and software updates.
In contrast, a large retailer selling both online and in
physical stores and interacting with customers via web, mobile app, and several social media channels needs
to enable real-time inventory updates, personalized recommendations, and smooth checkout experiences across
all touchpoints. In this case, a flexible microservices-based, cloud-native solution with a headless
frontend is more suitable as it can support consistent customer experiences across channels and seamless
data synchronization among systems
4
Development tools & technologies selection
Having chosen the architectural approach for your solution, you can now consider what tools and technologies to use for its implementation. For example, in case of bespoke development, you should decide which programming languages to use when building and deploying your solution and what additional tools will help you deliver a seamless user experience, such as content management systems or search engines, and support your business operations.
5
Development processes & team structure setup
Ensure your development team has the right skills, composition, and tools needed to build, deploy, and maintain an ecommerce solution based on the chosen architectural approach. If you opt for a modular design, such as microservices, establish Agile processes and cross-team collaboration practices to streamline simultaneous development of several components. Also, in case your internal team lacks relevant expertise or experience, consider turning to external experts or software development companies to get the necessary support and accelerate the implementation.
6
Ecommerce solution development & implementation
Proceed with the actual development and/or implementation according to the chosen approach and selected development tools. At this stage, define the structure of the ecommerce solution’s components, as well as its data flows and integration points. Then, build the components for bespoke systems or customize and configure the off-the-shelf platform’s modules, set up integrations, and ensure seamless interaction between all parts of the solution. Once complete, deploy the solution to the target environment or, for the SaaS-based model, launch the store, continuously monitor its performance, and optimize it if needed.
Build your ecommerce solution with the right architecture
Whether building a simple online store, a complex multi-vendor marketplace, or a feature-rich mobile commerce app, retailers need to choose the right ecommerce architecture to provide high-quality customer experiences, efficiently support business operations, and support sustainable business growth. However, this choice can be challenging as it requires careful evaluation of their existing IT infrastructures and deep knowledge of the nuances of each implementation option. Itransition’s experts help ecommerce companies select the optimal design pattern for their ecommerce needs and implement digital solutions tailored to their business workflows.
FAQs
Ecommerce architecture provides a blueprint defining how online stores and other retail solutions are structured and how their components interact. With a well-designed architecture, retailers can build ecommerce solutions that meet their flexibility, scalability, and performance needs and support their business growth.
Ecommerce architecture has a significant influence on search engine optimization and ranking of an ecommerce solution. A well-structured architecture ensures fast page load times as well as a clear structure of internal links and logical URLs, which allows search engines to effectively crawl and index ecommerce site pages. When built using flexible architectures like microservices or headless commerce, ecommerce websites can easily handle a growing product catalog and the increasing number of users without downtime, signalling to search engines that the store is reliable.
MACH architecture is a modern approach to building flexible, scalable, and easy-to-maintain ecommerce solutions. The term MACH is an acronym of four technologies, microservices, API-first, cloud-native, and headless, used together to create an ecommerce solution that businesses can rapidly customize and adapt to changing customer needs and market demands. MACH architecture is particularly well-suited for ecommerce businesses because of their need for rapid adaptability, scalability, and omnichannel presence to meet ever-changing customer expectations.
Traditional ecommerce solutions usually follow the three-tier architecture that consists of several layers, each responsible for different functions in a solution and all working together. In more complex traditional systems, the number of layers can be increased to cover additional functional responsibilities.
- Presentation layer
This is the user-facing, or frontend, part of an ecommerce solution that customers see and interact with when browsing the store and making purchases. It includes a user interface, which visually represents all storefront elements, such as a homepage, product pages with images and descriptions, a shopping cart, checkout pages, menus, and navigation tools, and the underlying client-side logic that handles user interactions, manages communication with the server-side part, or backend, and ensures that the interface responds to customer actions. - Business logic layer
Also known as the application layer or the service layer, the business logic layer orchestrates the core functionality of an ecommerce platform, managing processes like processing orders, tracking inventory, calculating prices and taxes, handling payments, and applying discounts. The business layer ensures that all customer interactions with the online store are executed correctly. - Data layer
The data layer, typically represented by databases, is responsible for storing and managing the ecommerce platform’s data like product details, customer information, and inventory levels. It also ensures that data can be quickly accessed by other app components when needed. - Additional layers
In systems that have more than three tiers, extra layers are added to handle tasks affecting the entire ecommerce solution. The most common options include the infrastructure layer for deploying and hosting the application, the security layer for ensuring system security and protecting data, and the integration layer for connecting the ecommerce solution with other software systems like CRM, ERP, and inventory management systems.
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