how to build scalable Web Application

Components of Web Application Architecture

A web application is like teamwork of various components, such as user interfaces, databases, servers, and so on. It is a systematic process working in sync by leveraging the power of a blueprint, called web application architecture

In other words, the web application architecture represents a logical layout of the connection between the server and the client. The components of web application architecture ensure a better user experience, which further helps to grow a business online. 

Two Key Components of a Web Application:

Efficient web application architectures are able to keep changing as per business requirements to ensure optimum performance and the best user experience. 

web application architecture

A web application comprises two structural components: client-side and server-side. The client-side or frontend is where the user interaction takes place. That means the front-end of a web app should be interactive and functional to catch the audience’s attention. 

On the other hand, server-side or the backend addresses HTTP requests. Another component also contributes to the process, called database server. It acts as the bridge between the client-side and the server-side.

Different Web Application Architecture Components:

It is time to talk about the components of web application architecture:


Domain Name System (abbreviated as DNS) transforms human-perceivable domain names into computer-perceivable IP addresses. 

So, whenever you enter a website address in your browser, DNS converts it into the corresponding IP address, as the computer can only interact with numbers. DNS also saves Internet users from memorizing a long string of numbers. Modern web application architecture calls for a significant number of backend servers to cater to high-volume traffic requests from clients in a cost-effective way. 

A load balancer performs load balancing by distributing client requests to servers, which can cater to such requests by maintaining maximum speed. 

Moreover, a load balancer also stops a server from overworking to keep up the performance of the web application architecture. 

Whenever a server gets unable to fulfill the client’s request, the load balancer redirects the request to other backend servers. 

If the traffic load gets increased, then a new server may get incorporated into the group of servers. If that happens, the load balancer starts sending client requests to it by default.

Load Balancer:
what is load balancing
(Image Source: Ngnix)

Before understanding the load balancer, you need to know what load balancing is. We know servers contribute to handling client requests. Load balancing helps to share network traffic throughout a few backend servers (called server pool). 


Databases contribute to adding, deleting, organizing, searching, updating, and conducting computations. This web application component stores a large volume of records to help servers to process clients’ requests. 

Web App Servers:

One of the major components of the architecture of web applications is web app servers. It handles a client’s request and gets back to the browser with documents. However, when it comes to processing a client’s request, web app servers need the support of back-end infrastructures, which include database, cache server, and so on. 

At least two web app servers need to be active to process the client’s requests while being linked to the load balancer. 

Caching Service:

Caching service stores data that streamlines data searching and data storing. When the server-side sends the requested information to the client-side, the information gets stored into the cache, which further accelerates future request processing. 

In other words, caching plays a pivotal role to speed up computation, multiple computations, and generating the same results for a specific request. 

Now, let us check out two optional components of web application architecture:

The job queue is an organized list of jobs to be processed by servers in web application architecture. Servers need to process a heavy load of client requests. 

However, the most important or high-priority job must be processed first. To ensure it, servers connect to the job queue and process requests according to priority. 

Full-Text Search Service:

When a full-text search service is added to web application architecture, it helps users to search for information with the help of text function. That means users do not need to navigate through the entire website to find the desired result. 

A full-text search service leverages the power of keywords and searches for the required information among a heavy load of documents. An Almost Invisible Component of Web Application Architecture Services is generated at a certain stage of a web application. These services remain almost invisible to other components of web application architecture. However, other services and the web app itself keep interacting with them. 

Wrapping Up

Web application architecture is a systematic approach to communicating between every component of a web application. It directly impacts user interaction, user experience, and user engagement. Hence, when it comes to ensuring the best user experience, highly scalable web application architecture should be preferred. The web application architecture should also be efficient, problem solver, easily testable, and flexible along with having other features.

We are kotai Electronics, build high quality and scalable web applications with complete inhouse Design, Development, and Testing. Check our services section for more details about our web and mobile application development services.