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10 Best React.JS Development Companies for Startups
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10 Best React.JS Development Companies for Startups

TL;DR

Here are our top 3 picks of companies to hire React developers:

  1. ReactSquad
  2. Blazity
  3. Gun.io

Choosing the right React.js development company can make or break your startup. You need a partner who’s fast, reliable, and experienced with scaling tech startups—not just another agency that builds generic apps. 

We’ve handpicked 10 of the best React.js development companies that specialize in working with startups. Each one brings proven expertise and a track record of building successful products.

Best React.js Agencies for Startups

Here’s our selection of the best companies to outsource React.js projects to:

#1 ReactSquad

We are a marketplace of vetted React developers for SaaS startups. We screen our devs through 3 interviews and 4 weeks of a paid test project. They’re also handpicked by Jan Hesters, our CTO, and guaranteed to consistently deliver high quality. If you want to hire React developers with over 6+ years of experience, we’re the one to choose. 

Why Startups Choose Us

  • We offer transparent and startup-friendly pricing.
  • Get started on your project within 48 hours.
  • We offer a 7-day risk-free trial.
  • Flexible payment options.

Tech Stack

React.js, React Native, Next.js, JavaScript, Redux, Node.js, Remix, TypeScript, TailwindCSS, Shadecn.

Pricing

Pricing starts at $75 per hour. We offer flexible monthly payments to companies as well.

#2 Findreactdevelopers.com

This company is a Ukrainian company that develops web solutions with React.js. They specialize in diverse projects, from single-page websites to custom enterprise solutions.

Why Startups Choose Them

  • Time zone overlap with the US

Tech Stack

React.js, Redux

Pricing

Pricing is by request as Findreactdevelopers do not list prices on its website. 

#3 Relevant Software

​Relevant Software is a custom software development company that designs and builds digital products for companies across various industries, including travel, insurance, media and entertainment, and agriculture. It is headquartered in Lviv, Ukraine, but operates globally. Relevant Software offers services to hire web developers skilled in React.js, among other technologies.

Why Startups Choose Them

  • Has experience across multiple industries
  • Operates in US time zones. 

Tech Stack

React.JS, React Native, 

Pricing

You have to request a quote by filling out a form on its website.

#4 Devox Software

​Devox Software is an EU-based IT services and consulting company that specializes in creating custom web and mobile development solutions for startups and enterprises. They provide services in blockchain development, artificial intelligence, and logistics and offer services such as web development and UI/UX design. 

Why Startups Choose Them

  • Has a proven track record

Tech Stack

React, Redux, MobX

Pricing

Selleo does not list pricing on its website. However you can get a custom quote by filling out a website form where you share details about your project.

#5 Selleo

Selleo is a Polish software development company founded in 2005, specializing in custom web and mobile applications. Its team of developers focuses on technologies like React, Node.js, and Ruby on Rails to deliver scalable, high-quality software. Selleo works with clients across various industries, including healthcare, fintech, and e-learning.

Why Startups Choose Them

  • Experienced devs
  • Good communication and collaboration

Tech Stack

React.js, Node.js, React Native, Ruby on Rails, Ember

Pricing

Selleo does not list pricing on its website. After reaching out to Sales to discuss your project, you will receive an estimation of the workload and cost of your project.

#6 Blazity

Blazity is a specialized software development company based in Warsaw, Poland, known for its expertise in Next.js and React. Their service offerings include custom web application development, code audits, enterprise architecture consulting, and migration to frameworks like Next.js and React.

Why Startups Choose Them

  • Specialists in Next.js
  • Attention to detail

Tech Stack

React.js, Next.js

Pricing

Blazity also doesn’t display its prices. You need to fill out a form to get a quote. 

#7 Callstack

Callstack is a software engineering consultancy that specializes in building applications using React and React Native technologies. They offer services such as product development, process optimization, technology upgrades, and team training. Beyond client projects, Callstack contributes to the open-source community with projects like React Native Paper and Linaria.

Why Startups Choose Them

  • Responsive and professional
  • Highly skilled in React Native projects

Tech Stack

React Native, Remix, Next.js, Kotlin, JavaScript, CSS, C++

Pricing

Callstack does not display its prices. You must fill out an online form with your details to inquire about their prices.

#8 Brainhub

Brainhub is a software engineering company that helps tech companies build and modernize software. They offer services like web and mobile app development, cloud engineering, and UX/UI design, specializing in technologies such as React, Node.js, .NET, and AWS.  In December 2024, they merged with STX Next to enhance their expertise in AI, data engineering, and machine learning. 

Why Startups Choose Them

  • Offers flexible team scaling.
  • Experience in multiple industries

Tech Stack

TypeScript, .NET, Node.js, React.js, React Native, Electron, AWS

Pricing

Brainhub does not display pricing. You can request a proposal on their website.

#9 The Frontend Company

As its name suggests, TFC is a software development company that specializes in frontend development services and design. They offer front-end auditing services as well as legacy app modernization to companies.

Why Startups Choose Them

  • Good customer service
  • Experienced devs

Tech Stack

Angular, React, MongoDB, React Native

Pricing

The company does not list its prices on its website. You fill out a contact form and a sales rep will reach out to you. 

#10 Gun.io

Gun.io is a talent-matching platform that connects businesses with vetted software developers for freelance, contract-to-hire, and full-time positions.

Why Startups Choose Them

  • Large talent pool

Tech Stack

React, Node, Next.js

Pricing

Gun.io doesn't have set rates on its website. To get a quote, you'll need to contact the Gun.io team via a form on its website.

Who We Recommend

That’ll be us! Not to brag, but we have the talent and expertise to develop any React.JS project. As a 100% React-focused agency, we have specialists for all React.js technologies, including Redux developers, Next.js developers, TypeScript developers, React Native developers, and more. Each dev is rigorously vetted before being accepted into our talent pool too. We also offer a 7-day no-risk free trial to try before you buy.

Schedule a call today and get matched with a dev in 48 hours.

Hire reliable React Developers without breaking the bank
  • zero-risk replacement guarantee
  • flexible monthly payments
  • 7-day free trial
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About the Author
Jan Hesters
Chief Technical Officer, ReactSquad
What's up, this is Jan, CTO of ReactSquad. After studying physics, I ventured into the startup world and became a programmer. As the 7th employee at Hopin, I helped grow the company from a $6 million to a $7.7 billion valuation until it was partly sold in 2023.

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