React.js Development


React.js is a Javascript library for creating user interfaces, especially in web app development. Developers can use React.js to create large web applications that use data which is subject to change over time, without reloading the page. React speeds up the programming process and reduces errors with its reusable components, one-way reactive data flow, and virtual Document Object Model ( DOM ). Its main goal is to be quick, simple, and scalable.

Companies that use React.js

Advantages of React.js

Faster Development Time, Fewer Bugs

React.js allows you to easily construct front-end components from common UI design elements ( buttons, backgrounds, form fields, etc. ). These components are reusable, reducing the overall amount of code you need to write. Ultimately, your problems will be easier to isolate and fix.

Reactive Data Flow

React.js utilizes a unidirectional reactive data flow which reduces boilerplate and is easier to predict than traditional data binding. When your data shifts, React.js automatically updates and renders the correct components, making it faster and easier to write complex UI.

Virtual Document Object Model ( DOM )

React.js’ virtual Document Object Model ( DOM ) offers a quicker and more efficient way to update the view in a web application. A new virtual DOM representation of the UI is automatically created each time your underlying data changes.

Search Engine Optimized ( SEO )

Perhaps the greatest disadvantage of Javascript frameworks is that they are not search engine optimized. Though there have been some recent improvements in this area, search engines often have trouble reading Javascript-heavy applications. You can remedy this issue by running React.js on the server — its virtual DOM will be rendered to the browser as a regular web page.

React.js Customer Case Studies

Gett Gett
  • React.js
  • Redux
  • Ruby on Rails
  • Go Language
  • AWS (infrastructure)
  • MySQL
  • PostgreSQL
  • Webpack
  • Team Augmentation
  • Improved Code Quality
  • DevOps Consulting

Gett is a growing, on-demand mobility provider, offering customer and business services in New York, London, Moscow, and over 100 other cities worldwide. Sphere is working with Gett on a number of their international projects, including their ambitious plans to expand their business-related services. They aim to fulfill all their corporate clients’ transportation needs, including taxi, courier, and food services, while remaining competitive with growing companies like Uber and Lyft. Gett’s older system was not capable of handling these demands, and their teams required Sphere’s development expertise to convert them to a modern, flexible system based on micro-service architecture. One specific area of concern was the business-user interface. Corporate clients experienced delays when registering, selecting services, and placing orders through Gett’s website or mobile app.


Sphere is continuing to work with Gett to update its current system by implementing a new AWS architecture composed of self-contained micro-services organized by department. This improved system will enable continuous, horizontal expansion to adapt to Gett’s ever-growing needs and clientele. Sphere’s developers have joined Gett teams in various business account-related departments and divisions, including Customer Service, R&D, Supply & Demand, and B2B. For each micro-service, developers extract outdated code, rewrite code in the Ruby and Go languages, and integrate new code back into the system. To improve the business-user interface, the teams have implemented a new React.js and Redux stack. Corporate clients now experience fewer delays when registering, choosing services, and placing orders. React.js technologies also allow new code to be executed more efficiently, and any future UI-related issues can be more easily addressed and corrected. Sphere developers are continuing to share their knowledge and expertise with Gett developers, helping them to expand their business client services far into the future.

  • Ruby on Rails
  • PostgreSQL
  • Ember.js
  • React.js
  • ElasticSearch
  • SideKiq
  • Application Development
  • QA Automation
  • 3rd Party Vendor Integration

OneMain Holdings, Inc. (formerly Springleaf Holdings, Inc.) is a financial company that has been providing personal lending products for more than 100 years. They needed to start transitioning their brick and mortar business into the digital world. Their new service would be an site where a potential borrower could apply for a loan, get the application verified and approved, and receive the loan. The site also needed to offer customer support throughout the entire loan life cycle via backend logic and customer representative applications. With these improvements, OneMain’s clients would not need to visit physical branches at any point during the loan process.


Sphere provided a team of experts to assist with the rapid development of the application and the related test automation. We helped to implement complex integration with 3rd party financial vendors like IDology, InstantID, TheWorkNumber, Yodlee, GDS Link, Acxiom, and others. QA automation of a complex SOA (Service Oriented Architecture) application enabled fully testing the whole application in integration without hitting external services and allowed for the development of continuous integration. By augmenting our client’s team, Sphere helped OneMain to more quickly deliver their product and meet their ambitious goals.