5 Best Software Architectural Patterns You Must Know About

This article was originally published by Terasol Technologies.

The world increasingly relies on software, which permeates every aspect of human life, from mobile apps and medical applications to deep‑learning models, fintech systems, and smart buildings.

To deliver effective solutions, appropriate architecture must be used when developing these software systems.

Patterns are context‑specific solutions.

Architectural patterns are reusable solutions to common software architecture problems in a given environment.

Software defects have a huge impact on business; the main cause of failure is often the selection of an unsuitable architectural pattern, and many enterprises start development without a formal architecture.

When architecture design is missing, development teams are forced to choose a pattern without guiding principles, resulting in unclear roles, responsibilities, and dependencies.

Let’s look at a simple example.

An online banking app does not need the complexity of a micro‑service paradigm; a client‑server architecture is sufficient for retrieval requests. Without proper planning, the application can become overly complex and costly to refactor.

This article explains what software architectural patterns are and introduces several of them, reminding readers that many patterns can be combined within a single system to optimize each part of the code.

Although it is a computer‑science discipline, it is often considered an art.

Let’s explore what software architectural patterns actually are.

1

What Are Application Architecture Patterns?

Consider a marketing app development project.

Before building the app, you must define its design and architecture, which become the foundation for everything else, such as service communication, payment integration, and recommendation algorithms.

Decades ago, few patterns existed to address these challenges, but today we have a wealth of architectural patterns that provide specific benefits for different types of applications.

Software architectural patterns are repeatable solutions to general software‑engineering problems. In the earlier grocery‑store example, we can reuse a product‑recommendation algorithm and adapt it to the app’s needs.

The architecture used for the recommendation module is only a part of the overall pattern.

Now that we know what software architectural patterns are, let’s see why we should use them.

2

Why Use Software Architectural Patterns?

Software development companies apply architectural design patterns for three main reasons:

Build better systems

Patterns enable the creation of portable, reusable models that lead to scalable and extensible structures.

Simplify design changes

Many patterns can be modified early in development, resulting in a flexible, robust, and error‑free core architecture.

Facilitate stakeholder communication

Architectural patterns provide a common abstraction that stakeholders can discuss, negotiate, and reach consensus on.

Now that the significance of architectural patterns is clear, let’s examine five popular software architectural design patterns and where they can be applied.

3

5 Best Software Architectural Patterns

Let’s look at several popular architectural patterns that many software companies use to develop applications.

1. Layered Software Architecture

As the name suggests, components (code) are divided into layers of sub‑tasks stacked on top of each other. This is the most common strategy, often built around a database, so many business applications naturally store information in tables.

Many popular frameworks such as Java EE, Drupal, and Express are designed with this structure, resulting in naturally layered applications.

Sometimes called the “N‑tier architecture.” The diagram below shows a four‑layer design.

Presentation layer: the user‑interface where users view and input data.

Business layer: executes business logic in response to server requests.

Application layer: acts as a bridge between the presentation and data layers.

Data layer: manages datasets using a database.

When should the layered architecture pattern be used?

Consider the following scenarios:

When a small team needs to create an application quickly.

Applications that prioritize maintainability and separation of concerns.

Enterprise‑level applications that must follow traditional IT structures and processes.

Layered architecture is suitable for:

Amazon‑style e‑commerce web applications.

General desktop applications.

2. Microkernel Software Architecture

The microkernel (or plug‑in) architecture is used when building systems with replaceable components. It consists of two main parts:

The core system handles the most basic operations of the application.

Plug‑in modules provide additional, specialized functionality.

Imagine a chat application whose core lets users exchange text offline. Later you add voice messaging; the microkernel pattern lets you plug this new feature into the existing system without rewriting it.

When should the microkernel architecture pattern be used?

When there is a clear boundary between basic routines and higher‑level rules.

The application has a stable core and a set of dynamic rules that need frequent updates.

It works well for distributed development teams.

Microkernel architecture is suitable for:

Product‑based and scheduling applications.

Enterprise‑level applications that require adaptability, scalability, and portability.

3. Event‑Driven Software Architecture

Event‑driven architecture (EDA) is a flexible approach where services or operations are triggered by events.

What exactly is an event?

When a user performs an action in an EDA‑based application, a state change occurs and generates a reaction—this action is the event.

In layered architectures, data flows sequentially from one layer to the next. In contrast, EDA allows modules to react when specific events happen. EDA includes mediator and broker topologies.

When should the event‑driven architecture pattern be used?

For applications that require asynchronous data‑flow systems.

When scalability and extensibility are needed without altering existing systems.

To build complex applications that need perfect data streams or to gradually grow an application.

Event‑driven architecture is suitable for:

Building JavaScript websites and e‑commerce sites.

4. Microservices Software Architecture

Microservices consist of independent, communicating small programs that together form a complete system. Each microservice has a specific responsibility, allowing teams to work on them independently.

The common denominator is communication; messages between microservices must remain backward compatible.

When an application is built with microservices, adding new features or updating a service does not affect others. Modules are loosely coupled, making them easy to understand, modify, and extend.

When should the microservices architecture pattern be used?

For teams that want to rewrite monolithic systems in a more sustainable way.

For applications with large, rapidly scaling data systems.

When development teams are distributed globally.

Microservices architecture is suitable for:

Websites with a moderate number of components and clearly bounded enterprise data centers, e.g., Netflix.

5. Space‑Based Architecture

Space‑based architecture addresses scalability and concurrency challenges by distributing processing and storage across multiple servers, eliminating a single database bottleneck and using in‑memory data grids for high scalability.

This architecture spreads processing and storage across many servers, minimizing functional failures under high load.

When should the space‑based architecture pattern be used?

For applications that handle massive concurrent database accesses or writes.

When an application must solve scalability and concurrency problems.

Space‑based architecture is suitable for:

Developing e‑commerce or social sites such as YouTube.

4

Choosing the Right Architecture Pattern for You

Other patterns such as Model‑View‑Controller, Blackboard, Proxy, and Event‑Bus designs are also useful in various aspects of software development.

The core idea for everyone is consistent: define basic quality metrics for the application, improve product functionality, and accelerate the building process.

We hope this blog post helps you understand the fundamentals of software architectural patterns and identify which patterns best fit your application needs.

Original link:

https://terasol.medium.com/5-best-software-architectural-patterns-you-must-know-about-20ba9c54c9cd

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