JavaScript development

Get fast, feature-rich apps and websites built for your users’ needs

When to choose JavaScript app development

JavaScript (not to be confused with Java, but you probably know that, don’t you? :)) is one of the most popular programming languages on the planet, used to create user-friendly, interactive websites and web apps. So whenever you want one, you’ll probably have at least some work to do using it.

(If you know why you’re choosing JavaScript, you can skip this part. Our SEO person made us write it. And if you decide to work with us, we’ll help you verify if it is indeed the best choice for your app, anyway.)

We probably wouldn’t be wrong if we said that the majority of websites today use JavaScript. In fact, we just checked, and some 97% of all websites use JavaScript as a client-side scripting language. And, having evolved over the past 25 years, it’s one of the most universal languages, too.

On websites, it can be used to do things like adding hover effects to buttons and text, creating image galleries, animating elements on a page, playing audio or video, hiding and showing navigation menus, etc. Essentially, it makes a static web page dynamic. And it’s what you’ll use if you want to add some oomph to your website.

It’s also, quite obviously, used to create interactive web and mobile apps using an extensive library of frameworks, such as React or React Native. Developers also use it to build in-browser games.

Since it’s a client-side programming language, it’s technically used for frontend development in general. But it can also be used on the backend, helping make an app cohesive in its performance. So, finding a full stack JavaScript development company is always a good idea. Which – you guessed it – DeSmart is, with our 20 years of experience using JavaScript and other languages to build functional, usable software products. 

But before we go on to show you a few of them, let us do our SEO person a favor and discuss why JavaScript is probably a good idea for your software development project. (Or you can scroll right down to some samples from our portfolio.)

The benefits of custom JavaScript development

  • Speed

Because it’s faster to execute code right in the browser, on the client-side, JavaScript makes websites and apps perform better and reduces waiting times (and frustration levels) on the part of the user.

  • Versatility

JavaScript can be used in too many ways to count and works well in a variety of environments, with a variety of frameworks, to build a variety of apps and features. And it works in every modern web browser.

  • Efficiency

Apps built using JavaScript are light, fast, and more efficient. This is because (among other things), the code can be processed on the user’s system, helping free up server space (which also reduces costs.)

  • Functionality

You can use JavaScript to build a wide range of interactive features and components, creating functional user interfaces and feature-rich software products and websites.

  • Great user-experience

JavaScript is used to build usable, responsive websites and apps people can enjoy on any device. Most social media networks rely on JavaScript for their user interfaces. 

  • Cost-efficiency

Using JavaScript frameworks can reduce project delivery times and the amount of server space needed. It’s also open-source, so it keeps growing while you have unlimited access to the improvements and new developments.

Why choose DeSmart as your JavaScript development company

We know anyone would say that, but we’re really not your usual JavaScript development company. We’re a team of senior developers with 20 years of experience in custom app development using a wide range of programming languages, including JavaScript. 

And besides the software development itself, we’ll also support you along the entire product development cycle – from product discovery, idea validation, and defining your software business model to extensive user research and user experience design to creating the actual MVP and beyond. We spend quite some time at the beginning of our project together to make sure all the pieces fit together and that we’re using the best software solutions (including the programming language) to meet your product requirements, your business goals, and your users’ needs. 

This also means we’ll be honest with you if we think there are better ways to achieve your goals that are more beneficial to your business and bottom line. And that’s because once we start a project together, we’re part of your team, invested in your business goals – all to create a usable, scalable, and future-proof software product that wins the hearts of your target audience (and your C-suite).

Our software development projects

Since it’s the world’s most popular programming language, we’ve used JavaScript to create many successful software products in the past for clients across industries, including SaaS platforms and marketplaces. Always focused on a great user experience for their customers.

What our clients say about our software development services

DeSmart Software Development has succeeded where several other companies have not. I started this project with a certain vision of what I wanted, but no other companies have been able to provide me with what I wanted. With DeSmart Software Development, I have gotten what I wanted and more.
We received a great deal of effort for our money, and I’m happy with our collaboration. The quality of work was professional, and their team identified any bugs by themselves most of the time. Based on the ideas we provided, they came back with an improved solution. They also gave us extra product functionalities.
The initial meeting we had with DeSmart before we started the project was really effective. I recommend doing so if you have the opportunity. Also, their communication, speed of development, and expertise were impressive. DeSmart was excellent at providing their own ideas, which benefited the project greatly.
DeSmart is synonymous with service quality. The company works in a truly agile mode, regularly delivering work increments, which allows to quickly and easily synchronise on requirement details. I was especially impressed with the dev team’s capability to quickly learn and start using our new APIs.
I’d highlight that their ability to adapt is exceptional. We didn’t go with a fixed scope and ended up with a different product than we’d had in mind. They were accommodating of changes and adjustments. That made them very easy to work with. They were also very transparent about pricing, which we appreciated.
I was impressed with their developers' efficiency, speed, and flexibility . Cooperation was smooth and uninterrupted. Monitoring of resource consumption to be improved. Great culture fit. Good value for cost. Company values aligned.


We realize you might not be familiar with all the aspects of the software development process. So here are a few pointers and explanations you might find helpful. And if you have more questions, send us a message, and we’ll get back with the answers.

What are the first steps when we start working together?

1.We always start with consulting your project with our product and business teams to see if we’re indeed a good fit.

2.We’ll then create a cost estimate and a proposed timeline.
Then we’ll organize workshops to help us define the business and product requirements so that we can build the best software solution for your needs. The people who took part in the workshops will make up the foundation of your project team.

3.We sign the contract and set up a kickoff meeting to nail down all the project details.

What are the benefits and drawbacks of the technologies you use?

Our development team will talk you through all the benefits and drawbacks of a specific technology for your specific project so that you know all you need to know to make your decision before you actually make it.
One of DeSmart’s core values is transparency, and we always inform our clients about any risks involved.

Will I work with a dedicated contact person on your team?

This really depends on your requirements. We have project managers, testers, and developers on board, and everyone’s equally involved in the project. This means you can talk directly to the developer working on your software and avoid the usual miscommunication that can happen when information travels through the hands and keyboards of multiple people.

Do you use project management software like, e.g. Jira?

Yes, we communicate using Slack and Jira and try not to use email too much. We’re also open to adjusting to the tools your company uses.

Are you a stable company?

Oh, we are. In the past 19 years, we’ve completed over 200 projects and have a full-time in-house team of about 30 people. We’re also the founding members of – the Polish Software Development Association. Go to to read what our current and past clients have said about working with us.

Why would I want to work with you?

We’re a boutique software house hiring a maximum of 30 people. Among other things, this means that your project is always a priority for us – we just can’t take on too many projects at a time. We’re also super honest and transparent and will always give you a clear picture of what’s going on.

Our team includes experts with many years of experience, and we’re often asked by other software houses to support them with their projects.

We also have a unique company culture. We’re teal-oriented and value a human approach to software development (which is why “Human-first software development” is our tagline) and work in general. And you can see it both in how we run the company and the way we work with our clients.

Who can I talk to about an upcoming project?

Set up call with Bartosz Drzewiński - here's his calendar.

Take a look at our blog to learn more about our approach to software creation.

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