JavaScript Development Services

Relevant has been providing full-stack JavaScript development services since 2013. We help mature businesses and startups set up remote full-stack JavaScript development team.

Client testimonials

Full-stack JS development solutions we provide

Frontend development

If you’re starting a web application, we’re here to implement the visual experience its users will love, using React.js, Angular.js or Vue.js frameworks.

Backend development

We will choose the right tech stack and develop a backend according to the latest best practices, using proven tools and technologies like Node.js, PHP, Python or Ruby.

API integration and development

Relevant’s experts will build reliable and secure connectivity between your systems and applications.

Database design

Our database designers ensure your data is properly stored and replicated, guaranteeing the optimal performance of your backend.

How we differ

Agile approach

We offer a highly-skilled team of specialists you can extend or reduce whenever you need. 


Dedicated project managers

Our project managers can handle multiple tasks, planning and organizing the project workflow.


Average staffing time — 2 weeks
The staffing process is efficient and fast enough to start working as soon as possible.

8.9/10 client satisfaction score

Our clients appreciate the code quality we deliver and the great personal relationships we build with them.

80% of the company – senior engineers

We can boast of a team of experienced and talented specialists since we only hire senior and middle engineers.


78% employee retention rate

We nurture long-term relationships with our employees, which makes them want to continue working with us.

Tech Stack

We focus on technologies that allow for building reliable, nimble, and secure web products. Our JavaScript services include cloud and DevOps.



Google Cloud
Microsoft Azure
IBM cloud

Our JavaScript development projects


Developing a SaaS platform that assists UK homebuyers

View case


Gamifying customer support with a Zendesk app

The Netherlands
View case


Visualizing air quality sensor data in a web dashboard

View case

Engagement models

Decide which model best suits your project


We follow the Agile methodology and our processes correspond with the average software development life-cycle. They include ideation, planning, designing, coding, testing, deployment, and maintenance.

As a reputable full-stack web development company, we assure you that all our engineers are qualified to implement professional software solutions. But If you plan to hire a full-stack developer at Relevant, you’re welcome to conduct as many interviews with our specialists as you need to make sure they are the right people for the job. This includes holding Skype calls and giving technical assignments to check their skills.

We use Atlassian’s famous Jira software for progress, issue, and bug tracking. As a manager, you’ll have special high-level access to this system.

Absolutely. At Relevant, we follow Agile, Scrum, or Kanban depending on the project and the client’s requirements.

From 1 to 100, depending on your project size and duration.

Yes. At Relevant, we assign a project manager who will be keeping an eye on all processes in your project, monitoring the development and making sure everything goes according to your requirements.

As a company providing full-stack website development services, we offer product development and assembling a dedicated team. Discover more on our Pricing page.

Yes. We will sign a non-disclosure agreement to ensure the security and protection of your sensitive information before the development takes off. We’re also open to signing a Service Agreement (MSA), a Statement of Work (SOW), and a DPA (Data Processing/Confidentiality Agreement). More on these and other essential documents here.

We will always keep you in the loop when building your software. The dedicated project manager will make sure you know about the progress and any issues, while you can personally check the progress in Jira or similar software.

We use a wide range of project management tools, including Jira, Slack, and Skype. However, we’re always open to using the tools the client prefers and feels more comfortable with. 

This has never happened at Relevant, since making sure the client is satisfied with our JavaScript app development services is our priority. Nevertheless, if you’re not satisfied with our work, please tell us right away, and we’ll try to solve the issue as quickly as possible.

JavaScript will retain its popularity, considering that almost 70% of developers around the world use it regularly. After all, this programming language is still considered the easiest to use among its competition, and it’s ingrained into absolutely everything. As a JavaScript development company, we’re sure JavaScript development services will remain in demand for many years.

The increased development efficiency and higher performance are the primary reasons. Moreover, full-stack JavaScript development has plenty of resources for you to use and access to open-source tools that will help you in your projects. Additionally, when you hire full-stack developers, you get many lines of reusable code, which speeds up JavaScript application development.

Having qualified full-stack developers in your team speeds up the development. Instead of dividing user stories into frontend- and backend-specific tasks, you could work with a single person responsible for a particular story. This leads to less miscommunication and more stable workload.

The difference between the MERN and MEAN stacks is the use of the Angular.js framework in MEAN instead of the React.js library in MERN for frontend web development.

According to Career Foundry’s analysis of over 200,000 coding tests in 143 nations, 72% of companies around the world hire JavaScript developers. Also, a HackerRank report revealed that the global demand for JavaScript outweighs the available expertise on the market.

We invest in the best pieces of stack out there. Here is the list:

  • React: A JavaScript library that helps building user interfaces and is primarily used for single-page applications. The benefits of React are its speed, flexibility and usability.
  • Angular: A TypeScript-based platform and framework. Its component-based architecture provides a high code quality, while each component is encapsulated with its functionality.
  • Visual Studio Code: An efficient text editor that’s already a standard for most JavaScript developers. Makes building and debugging modern applications easy, providing tools for working with local or cloud applications.
  • Chrome Developer Console: The most popular and genuinely powerful tool for any frontend developer. Inspecting, debugging, and even light prototyping are among its features. Additionally, there’s a Lighthouse app that provides a detailed report on your app about its performance, accessibility, SEO, and other metrics.
  • ESLint: Known by almost any JavaScript developer, this source code analyzer or linter for JavaScript is a flexible and powerful tool to check your source code for bugs or potential errors.
  • Vue: The JavaScript framework combines modern technologies like Virtual DOM, TypeScript, Reactivity, and CLI with the classic web technologies like HTML, JavaScript, and CSS.
  • Babel: A compiler that allows writing code with the latest JavaScript features without worrying about the support of dated browsers.
  • Closure Compiler: An excellent tool for optimizing your source code JavaScript, it also checks the syntax and removes dead code by recompiling your JavaScript source into optimized JavaScript code.
  • Rollup: A module bundler that compiles pieces of source code into an application or even a library.
  • Parcel: This tool is a web application bundler with great performance that requires no configuration.
  • JSHint: A community-driven tool that can detect different types of errors and problems in JavaScript code.
  • Mocha: A feature-rich JavaScript test framework that can make synchronous and asynchronous testing a simple and enjoyable process.
  • Jasmine: A behavior-driven framework for testing JavaScript that doesn’t require any other framework or DOM and has a clean syntax.
  • Jenkins: This tool is famous for being an open-source automation server that allows developers to efficiently deploy their software.