Design Principles For Building Scalable Systems With Custom Software

Building Scalable Systems With Custom Software

With custom software potentially garnering massive traffic volumes, scalability is a major challenge. It’s critical to make sure that software can scale to manage increases in traffic while maintaining performance and security. You should create Custom software by keeping scaling in mind, taking measures from the beginning to ensure that it can handle the demands of scaling, to scale efficiently.

Let’s look into scaling custom software and investigate some guiding principles when creating it.

Important Scalability Design Principles For Custom Software

Scalability design principles are guidelines for creating custom software that can adapt and grow as the needs of the business change over time. Here are some key scalability design principles:


Caching frequently accessed data can significantly improve the system’s performance and make it more scalable. Heavy data affect the overall performance of the software. Caching is a traditional technique for this problem. A cache temporarily saves data to send future requests for that data to the client more quickly.

It removes the need to connect to and query the database whenever the client asks something. This speeds up access to the data and is especially effective when growing read-intensive web applications.

For instance, if a client asks for a user profile, the software first looks in the cache for that information. The client receives it if it exists. Otherwise, a query is made to the database. Measurement of cache hits/misses and LRU age is crucial. Furthermore, it is occasionally necessary to divide local and global cache.

Adopt An API-First Mindset

In an API-first strategy, the custom software’s APIs are viewed as separate modular components. It guarantees that an API can access all of the software’s features. The API-first strategy also improves scaling. It allows software constructed from smaller disaggregated elements to grow efficiently by scaling only the necessary parts. API gateways offer extensive functionality across several API endpoints.

The API gateway acts as the application’s sole point of entry. It integrates several user requests and sends them to the present locations. The gateway then combines the results of several queries before delivering them to the user, decreasing the interactions between the user and the software.


Concurrent queries improve overall speed unless the DB server begins to strain. It is typically the main bottleneck. Fortunately, the clientele prefers reading over writing. A user’s authentication, the page display, and the comments loading can all be done without having to write anything.

Therefore, even if the primary database is unavailable, a read replica can still provide the majority of necessary flows. And you are free to launch an unlimited number of read replicas. Launch replicas of replicas if necessary to resolve this problem if it is not resolved.

Similarly, keeping most session-related data on the client side seems appropriate. This method avoids the dreaded locks on the sessions table unless you overcomplicate the procedure and run into client-side data migrations. It also allows several servers to handle requests for the same client.

Avoid A Single Point Of Failure

Competing in a market that is expanding is tough. Keeping everything under control indicates that you aren’t working hard enough. Failures do occur. The most crucial thing, though, is to lessen their overall impact and ensure that you always have a choice in such situations.

A failure should also happen as soon as possible, even though it may seem contradictory. Using this strategy, you may limit any issues and prevent them from spreading by capturing shared resources.

Scale Horizontally Rather Than Vertically

Both physically located servers and virtual machines have a maximum size. A system can only scale horizontally to a certain degree. But that barrier is being advanced farther and further. Databases themselves are heading in that direction. Additionally, the cost of (horizontally) installing yet another (commodity) server increases linearly while the cost of (vertically) upgrading a server climbs exponentially.

Design For Automation And Maintenance

Software needs to be monitored and updated over time to ensure good operation. Our perspective needs to alter as we transition from one era to the next. Do we still require server reconfiguration? Is it impossible to replace outdated ones with new ones configured offline as part of their image creation?

What is monitoring data relevant to us? What specific details does it give us? Never undervalue the time and effort required to maintain your application. Your first public software release is a remarkable result, but it also represents the start of the real work.

Asynchronous Processing

The asynchronous method must be integrated into software because it is crucial to client-server communication. Asynchronous processing enables a system to handle large amounts of data or processing requests. It breaks them into smaller, manageable units that you can process parallelly. When a user submits a request, we can notify them of a successful deal and update them as the request is being handled.

Strive To Be Stateless

Stateless systems do not maintain any client-specific state, making them more scalable as they can handle more clients more easily. Avoid the urge to track specific state details in, for example, your application servers to avoid inter-component communication.

We can never completely avoid state data unless we host just static pages. We must ensure that state information is stored in as few locations and within components designed for it as possible. Although distributed key-value stores are, web and application servers are not. From a scalability perspective, keeping it there enables you to treat your web servers as fully replaceable instances.


Maintaining growth is difficult, especially when supplying new features and collecting a technical debt. It is twice as difficult in a highly competitive market. The most important rule for us is reducing complex things into small, basic, and predictable chunks. These eight principles will help you make scalable custom software for your businesses and improve performance. So, read the above point, and if you have any queries, you can contact Expert Helping Businesses.

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