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Hire Expert React.js Developers

Hire dedicated senior React.js developers as your extended team.

ISO 9001 & 27001 Certified with over 98% 5-Star Rating

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Are you interested to learn more about our React.js services?

What happens after you contact us?

Our solution experts will answer your questions in a secure online meeting. You will get good information and honest advice in plain English. You are then free to choose how to move forward.

Our clients include 150 Global Brands, Silicon Valley Founders

React.js Development Services

Capital Numbers is a leading custom company providing interactive React.js development services to create modern, interactive, and reliable user interfaces across all business domains. Our Developers require extremely low supervision and each one of our Developer is proficient enough to work remotely and contribute as an active member of your development process.

React.js Team Augmentation

React.js Team Augmentation

Hire dedicated React.js experts and engineers from us and save over 50% on development costs. The developers become part of your team and work directly under your control.

Testing & QA

Testing & QA

Partner with us to ensure that your UI/UX is compliant and secure. Also, compete with confidence as we bring your React.js architecture up to date and speed.

Architecture & Design

Architecture & Design

Our React.js architects create state-of-the-art web interfaces that tick all the right boxes regarding a positive user journey and experience.

React.js Development

React.js Development

React Web Development We develop tailor-made React Web Applications for all the niches. We have delivered applications for several industries, including healthcare, e-commerce, manufacturing, retail, travel, finance, and education.

Test Driven Development

Test Driven Development

Our developers use Jest and Enzyme to write test cases to ensure the correctness of React codebase. This ensures your React app is stable and error-free.

Migrate to React.js

Migrate to React.js

Whether you have an application running in any other framework or built using a template system, we can help you migrate your app to React. Our teams can also assist with the creation of APIs as needed.

PWA & SPA Development

PWA & SPA Development

Whether you want to build a Progressive Web App (PWA) or a Single Page Application (SPA), we know how to give you an edge through responsive designs that resonate with your users.

Maintenance & Support

Maintenance & Support

Have a legacy React.js app? We’re here to help. From debugging and maintenance to feature development and DevOps, we'll tailor a development plan to meet your needs.

DevOps for React.js

DevOps for React.js

Do you need help setup CI/CD pipeline for your React.js based applications? Our seasoned DevOps have expertise in working with all major cloud platforms such as AWS, Azure, and GCP.

Or, Use this form to tell us about your needs.

Our React Framework Expertise

  • great option

    A great option if you want a React-based static-site generation, server-side rendering, and serverless deployment Learn More

  • Gatsby is an

    Gatsby is an extremely popular static site generator based on React and offers many famous developer-friendly plugins.Learn More

  • No framework

    No framework? No Problem. Our expert React.js developers can handcraft your applications as per your needs.Learn More

  • Using TypeScript

    Using TypeScript with React can increase development speed, improve code readability, and much more.Learn More

  • An excellent choice

    An excellent choice for creating mobile apps that can be deployed on Apple and Google Play stores.Learn More

  • For writing applications that behave consistently, run in different environments (client, server, and Native), and are easy to test. Learn More

Or, Use this form to tell us about your needs.

Looking for Mobile App Developers?

Learn More about our React Native Development Services

Expertise with Related Technologies

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Book A Call

3 Steps To Build Your Custom Team Of React.js Developers


Choose React.js Developers

We have a team of 100+ React.js developers. You can interview and shortlist candidates from our in-house tech pool and decide who joins your team.Want to start with this step? Request Resumes >>


Integrate Team into Your Projects

Our developers have now become a part of your team. They work dedicatedly for you, and you can communicate with them directly. You can start assigning them tasks and get daily updates along with a timesheet.Have you got questions about working with remote developers? Book a no-obligation call >>


Scale On-demand

We also let you scale on-demand, grow your team during high-volume periods, and ramp down team size when needed. In short, we make it easy for you at every step like a true partner on whom you can rely.

Why Hire Dedicated Team from
Capital Numbers

  • We Match Your Needs We Match Your Needs

    By partnering with Capital Numbers, you'll get access to our 700+ in-house developers and will be able to fill any role immediately.

  • You’re in control You’re in control

    You get a dedicated React.js development team entirely under your control but without the administrative issues and hassles. You control your team’s work, and all processes are fully transparent, so you know exactly who’s doing what, when, and why.

  • Work with Experts Work with Experts

    We’ll help you hire React developers with a deep understanding of Web / Mobile Development, React.js, React Native, JavaScript, TypeScript, UI/UX, Git, and Agile.

  • Hassle-free production Hassle-free production

    Our HR specialists, office managers, and system administrators make sure your development team’s working conditions are perfect.

  • Low Attrition Low Attrition

    Corporate outings, regular training, engagement activities, career counseling, grievance handling – our HR veterans will sure every developer you hire with us stays motivated to try hard to make you successful.

  • Zero Overheads Zero Overheads

    Payroll, taxes, benefits, sick days, and vacations for your team – we’ve got you covered.

  • 50% Cost reduction 50% Cost reduction

    Our clients have been able to save up to 50% in labor costs.

  • 4.8/5 Rating on Clutch 4.8/5 Rating on Clutch

    Our clients highlight our ability to build great personal relationships with them, except for the excellent code quality.

  • 75% of the company – senior and middle developers 75% of the company – senior and middle developers

    We invest in attracting the best talent from the market. We hire only strong middle and senior React.js developers and no juniors.

  • ISO 27001 Information Security ISO 27001 Information Security

    Capital Numbers adheres to ISO 27001 certified information security standards to ensure that your IP and investment are protected.

Case Studies

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Real-time Video Chat App for Food-lovers

Tech Stack: Node.js, React.js, Socket.IO, Twilio, NoSQL, Microsoft Azure

This interactive web app lets users avail discounts on their food deliveries. Users need to generate food delivery coupons, copy-paste them in this web app, and win in-app games to get added discounts on their online orders.

Read More
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Candidate Screening Platform Development for Remote Hiring

Tech Stack: Node.js, React.js, MongoDB, REST APIs, Braintree, PayPal, AWS

This is a cutting-edge candidate screening portal that connects the recruiters with the best fit candidate matches from across the globe. It helps employers find the most qualified full-time, part-time, on-site, flexible, and remote talent with just a few clicks.

Read More
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FinTech Web App and Chrome Extension Development

Tech Stack: Python, React.js, Innovis API, Sinch API, Finicity API, Dwolla API, SendGrid, PostgreSQL, AWS

This is a FinTech web app that speeds up digital lending and improves the borrower's journey.

Read More

Not Just React.js - You can Build a Complete Team with Capital Numbers


People who excel at everything from planning and scheduling to progress tracking and workflow optimization.

Related tools and technologies:

Our experienced business analysts will help you refine the project requirements and improve business processes through rigorous research and detailed documentation.

Related tools and technologies:

Our Designers help you transform your product vision into user-friendly designs and create user journeys optimized for the best user experience and highest conversion rates.

Related tools and technologies:

Our front-end developers create the part of your application that the users see and directly interact with. They make sure the experience is equally smooth and user-friendly to every person who uses the app.

Related tools and technologies:

Reducing the time needed to integrate changes while improving the quality is a tremendous competitive edge in today’s world. We employ the best CI/CD practices to minimize the number of errors during integration and deployment to streamline your project.

Related tools and technologies:

From meticulous manual testing to writing complex automated testing solutions, our bright QA engineers and scrupulous testing teams will ensure your software solution is free from any performance, stability, or functionality issues.

Related tools and technologies:

Or, Use this form to tell us about your needs.

Frequently Asked Questions

Capital Numbers is an ISO 9001 and ISO 27001 certified digital solutions company with 650+ experts working full time across 3 Delivery Centres. Established in 2012, Capital Numbers are headquartered in Kolkata, India, with offices in the US and Australia. We are winners of multiple awards from Duns and Bradstreet, Clutch, GoodFirms, Deloitte, Financial Times, Nikkei, Economic Times, and Bengal Chamber of Commerce (The oldest chamber of commerce in India).

We are incredibly proud to have over 100+ Five Star Reviews on platforms like Clutch, Google, and GoodFirms which is the most compared to any of our peers in the industry.

We thoroughly screen our React JS developers to ensure we only match you with the talent of the highest caliber. Of the more than 10000 people who apply to join Capital Numbers each year, fewer than 5% are selected for interviews, and only 1% are hired. You’ll work with engineering experts (never generalized recruiters or HR reps) to understand your goals, technical needs, and team dynamics. The end result: expert vetted talent from our network, custom matched to fit your business needs.

We make sure that each engagement between you and your React.js developer starts with a trial period of up to one week. This means that you have time to verify the arrangement will be successful. If you're delighted with the results, you can continue for as long as you'd like. If you're not entirely convinced, you won't be invoiced for the time spent. From there, we can either part ways, or we can assign another developer who may be more suitable and with whom we will commence another, no-risk trial.

We have a total of 40+ React.js developers who are having an average of 5+ years of experience in React.js development.

Yes, our developers will be matched with your needs, and we will share their profiles with you for review. You can conduct an interview with our developers before selecting them.

If, in any circumstance, if you are not satisfied with our developers, then we will replace the developer ASAP.

Yes, We sign a Non-disclosure agreement to secure the confidentiality of the source code and project idea.

Or, Use this form to tell us about your needs.

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Great Reviews

97 Out Of 100 Clients Have Given Us A Five Star Rating On Google & Clutch

Charles Douglas-OsbornCapital Numbers 5/ 5
Will HershfeldCapital Numbers 5/ 5
Jon KayserCapital Numbers 5/ 5
DeVon FavorsCapital Numbers 5/ 5
Scott R. WellsCapital Numbers 5/ 5
Xavier VillafuerteCapital Numbers 5/ 5
Read More Reviews

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650+ In-House Experts
25+ Awards in the last 9 Years
237+ Clients Worldwide
150+ Five Star Reviews On G2, Clutch, Google and GoodFirms
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