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Companies that use Node.js know that JavaScript is the go-to language for building dynamic websites.
Traditional back-end frameworks often struggle to keep up with increasing demands to deliver fast, scalable, and interactive products. They rely on multiple languages, heavy server loads, and complex integrations that slow down release cycles.
If you need something you can innovate quickly going forward, that gap between front-end agility and back-end performance becomes a real bottleneck.
That's where Node.js changes the game.
In fact, Node.js is so popular that quite a few major business enterprises are well-acquainted with the software. Companies that use Node.js include the following:
For many of these companies, including major financial services and fintech firms, Node.js has become their preferred runtime environment for JavaScript developers. Keep reading and find out why.
At Trio, our Node developers specialize in high-quality, fintech-grade backends that can keep up with the industry's ever-shifting demands.
Node.js is an open-source, cross-platform JavaScript runtime environment.
In practical terms, it's the technology that lets developers run JavaScript code outside the browser, including on servers, in APIs, and across distributed systems.
The fact that Node.js is open-source and cross-platform means that the framework is accessible in two ways. First, since it's open-source, developers can adapt its source code. Second, with it being cross-platform, it runs on virtually any operating system.
Node.js was developed in 2009 by Ryan Dahl. At that time, Apache HTTP Server handled the things that Node.js does now, but with less efficiency. Specifically, Apache couldn't handle concurrent requests. That was one of the primary motivators behind Node's creation.
Now, JavaScript developers can use server-side scripting to create dynamic web pages by running user requests on the server-side, or web server, rather than on the client-side, or web browser.
As we have already mentioned, Node.js is used by some of the most popular companies today. There are a couple of reasons why the runtime environment is so popular, many of which we have already alluded to.
Node.js is easy to learn. However, having said that, you still need someone with a good knowledge of JavaScript and object-oriented programming, so you'll probably still want seasoned developers.
If your team already uses JavaScript for their front-end, Node.js has a smaller learning curve. This shared skill base translates into shorter onboarding times and greater team productivity.
Because Node.js utilizes a 'JavaScript everywhere' paradigm, you don't need to switch programming languages between back-end and front-end development.
One language is the primary catalyst for full-stack development.
This simplifies things greatly, since it effectively leads to fewer files, less code, and overall fewer complications.
Many leading companies, including PayPal and LinkedIn, have cited faster development cycles and reduced deployment complexity as major wins after adopting Node.js.
Projects built using Node.js hit the market at a faster rate than if they were to use some other options. This is largely because of how lightweight Node is, which is one of the many reasons our developers find it useful for shipping an MVP and iterating on quick feedback.
From a technical standpoint, Node.js's event-driven, non-blocking I/O model allows it to handle thousands of simultaneous connections with minimal overhead. This makes it a top choice for real-time systems, like streaming apps and collaborative platforms, and even the building blocks behind some aspects of real-time payments.
Netflix, for example, reduced startup time by roughly 70% after moving to a Node.js-centered universal-JavaScript stack.
One of the reasons Node.js was made is to offer a more scalable alternative to Apache.
As we have already mentioned, Node.js can handle several concurrent connections. But another useful feature of Node.js is load balancing, which is the process of distributing tasks competently amongst resources.
Since Node.js applications are modular by design, they scale horizontally across clusters and microservices. Many large-scale companies like Walmart and Uber leverage this flexibility to handle millions of daily transactions while maintaining high uptime and low latency.
Similarly, this high uptime can be a great asset in things like banking apps.
Node.js has one of the largest open-source communities in software, which means strong support and a constant stream of community-built tooling.
Node Package Manager (NPM), the official package ecosystem for Node.js, is the largest and fastest-growing software registry in the world.
With over two million packages available on NPM, developers can integrate prebuilt modules for everything from authentication to analytics. This shortens development time dramatically.
For businesses, that means lower engineering costs and faster innovation cycles.
While Node.js is relatively new compared to other back-end frameworks, it is by no means a novelty. Let's look at how 15 global brands leverage Node.js for their own applications.
Netflix is a streaming service for television and film serving millions of users worldwide, and likely one of the most familiar to you of the companies using Node.js.
The user interface (UI) of Netflix was built using Node.js.
According to their team, the modularity of the framework is what encouraged them to use Node.js. As we already discussed above, that shift contributed to a roughly 70% reduction in startup time, improving the experience for millions of users.
Netflix engineers also note that Node.js's lightweight, asynchronous design helps them push frequent updates with minimal downtime.
Medium is an online platform for publishing articles with a large diversity of content. Their developers build the app servers with Node, accompanied by the web server NGINX.
They also take full advantage of the ability to share the same code across server-side and client-side, allowing them to ship platform updates quickly and keep the reading experience consistent.
Mozilla Firefox is a popular web browser. Many of its web apps use Node.js because of its memory capacity and the ease of use involved in being able to keep everything in a single JavaScript repository.
The tool also lets Mozilla developers quickly prototype, test, and deploy open-source tools.
Yahoo was first and foremost a web directory to find news, sports, and finance information. Its role soon extended to email and search engine services as well.
Front-end development is the main use of Node.js for Yahoo.
LinkedIn is the social network for professional connections.
LinkedIn switched from Ruby on Rails to Node.js in late 2011. This was mainly because LinkedIn developers wanted to optimize their mobile app, where everything is now written entirely in Node.js.
They were able to drastically cut down on server resources (from around 30 servers down to just 3), and the app is said to run 20 times faster than its predecessor.
Trello is a collaborative online tool that businesses use to organize projects and ideas using virtual boards.
The server-side of Trello uses Node.js, which lets users have near-instant updates.
Node's capacity to hold many open connections at once also benefits Trello, as it allows the platform to maintain smooth drag-and-drop functionality and real-time updates across global user sessions.
Businesses use GoDaddy to host websites and register domain names on the Internet.
Their back-end infrastructure is dependent on Node.js, allowing them to maintain quality apps and release new features quickly.
Uber is a ride-hailing service for people who need to get somewhere fast. Of the companies that use Node.js, Uber was one of the first to use the framework to its fullest extent by building the bulk of the Uber platform in Node.js.
There are three main reasons why Uber chose Node.js: ease of error-checking, fast processing speeds, and continuous development thanks to the open-source community.
Uber's dispatch system depends on Node.js to manage millions of simultaneous requests, dynamically scaling during peak hours to maintain performance.
As you're probably aware, NASA (National Aeronautics and Space Administration) is a United States government-sponsored department responsible for the research and exploration of space-related matters.
Microservices are a feature of Node.js where developers approach application development by presenting the software as a collection of small services rather than as an autonomous unit.
Using this feature, NASA was able to move its enterprise to the cloud. By consolidating its complex data systems through Node.js microservices, NASA improved data reliability and reduced time-to-recovery during critical operations.
PayPal is the go-to online platform for making electronic payments through a trustworthy service. PayPal uses Node.js to build user-facing content.
The PayPal software team likes that Node.js empowers developers to build both server-side and client-side applications with JavaScript.
When PayPal rebuilt its account-overview page on Node.js, it reported the app was built with 33% fewer lines of code and 40% fewer files, handled double the requests per second, and cut average response time by 35%.
E-commerce platforms like eBay let users buy products from individuals and companies via online transactions.
Node.js helps eBay by being able to maintain live connections to servers for nearly 200 million eBay users every day.
Groupon is another e-commerce platform, except it works with third-party services to provide special discounts and prices. Like LinkedIn, Groupon switched from Ruby on Rails to Node.js in 2015.
Their software developers migrated both their mobile and web traffic to the framework.
Higher scalability was their main justification, but this switch resulted in resource reduction for high traffic and faster web pages.
Walmart is a large American retail company operating several grocery and department stores across the world.
As one of the companies that uses Node.js, Walmart relies on the framework for its UIs and also as an orchestration layer to create application programming interfaces (APIs) for the company's various apps.
Orchestration layers permit developers to integrate multiple applications or services together. In essence, Walmart app users can use one platform to access several distinct functions.
Yandex is a Russian multinational corporation specializing in several services, from transportation to search engines. Yandex has numerous API libraries built in Node.js.
APIs communicate procedures between an application and another related application or operating system.
Citibank is a bank that, naturally, offers financial services: both offline and online.
The company uses Node.js for its mobile services with the framework Hapi.js.
This setup allows Citibank to securely handle customer transactions while rapidly deploying new digital banking features in its mobile ecosystem.
Even companies that rely on Node heavily tend to use it selectively, pairing it with other tools when the situation calls for it. It's worth knowing where the framework can start to show its limits.
Node.js runs on a single thread, which is great for juggling many light tasks at once, but when you throw it something like complex number crunching, video encoding, or data modeling, that same design can start to slow things down.
In those situations, our teams often offload the heavy lifting to other languages like Python for data analysis, Go for concurrency, or Rust for performance-critical services.
JavaScript isn't strongly typed, which can mean that large projects get messy if you're not careful.
TypeScript helps a lot by adding a type system and catching mistakes early, but it's not always enough for industries that can't afford even small errors.
Think of aerospace control systems or enterprise banking software; those teams often stick with languages like Java or C# that guarantee strict type checking before anything ever runs.
Node.js tends to shine in microservice environments or event-driven systems where each component does one thing well.
But in older, monolithic setups with lots of intertwined code, its asynchronous nature can make things more complicated to manage.
For a long time, Node.js didn't support true multi-threading, which meant it couldn't efficiently split heavy tasks across multiple CPU cores.
Newer versions have introduced worker threads and cluster modules to help with that, but these features aren't plug-and-play.
Node.js can power everything from small APIs to massive distributed systems, but the best setup depends on what you're actually trying to build and how your team works.
Microservices break an application into small, focused services that talk to each other through APIs. Each one handles a specific task and can be deployed on its own timeline.
Node.js fits this model almost naturally. Its event-driven structure makes it easy to manage lots of independent services, and it scales horizontally when traffic spikes. Uber and Netflix both use Node.js microservices to scale with real-time demand.
This is usually the kind of architecture we recommend for fintechs that need to scale quickly going forward without redesigning their entire product each time.
In a serverless setup, the cloud manages your servers. You write small bits of code that run when triggered, like sending an email confirmation or updating analytics after a transaction.
Node.js works nicely here because it starts up fast and doesn't take up much memory, and platforms like AWS Lambda, Google Cloud Functions, and Azure Functions support it natively.
When your application needs to share data between different systems, Node.js is a strong choice for building APIs, managing high traffic and frequent requests without choking the server.
Walmart, for instance, uses Node.js as an orchestration layer to connect internal systems through APIs, and GoDaddy uses it the same way for its hosting and domain services.
Building a single modular Node.js app can be faster, simpler, and perfectly fine for early-stage products.
The trick is to keep things loosely coupled inside the codebase so you can later split features into separate services without rewriting everything.
For global platforms that need fast response times everywhere (like banking apps that need to work regardless of where your client is), Node.js performs well in edge environments. Because it's lightweight and container-friendly, it can run close to end users, reducing lag.
In the grand scheme of things, these are just a few companies that use Node.js. There are many more, for the same or different reasons. What they share is a payoff in speed, scalability, and developer productivity from standardizing on JavaScript across the stack.
It's important to remember that these companies that use Node.js and its features do not just snap their fingers and produce first-rate applications.
Whether you need to augment your team or work with a dedicated Node.js development company, Trio can match you with senior, pre-vetted engineers experienced in fintech-grade backends.
Get in touch to learn more about how exactly you can get expert Node.js developers on your team, with production experience in heavily regulated industries like fintech.
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