React Development Company | React.js Services

Updated September 2026 · Written and maintained by the Progression Agency strategy team

Progression Agency is a React development company in New York City building web applications, SaaS products, portals and websites in React and Next.js, with dedicated React developers available for existing teams and full-stack delivery from design to deployment.

On this page · 11 sections

What does a React development company do?
React development services
Key features and components
Common integrations
Standards and quality
Our react development process
How much does React development cost?
Technology we typically use
Mistakes to avoid
Why choose Progression Agency for react development?
Related services

The short answerReact is the most used front-end library among professional developers and the foundation of Next.js, React Native and most modern web products. A React development company designs and builds React and Next.js applications, integrates them with APIs and back ends, deploys and hosts them, and supplies React developers to extend existing products. As planning figures, a React web application commonly costs $50,000-$250,000 and a dedicated senior React developer $12,000-$18,000 a month.

Cost ranges are US planning figures, not quotes.

React development searches — Companies search for a React development company when building a web app or SaaS product, replacing a legacy front end, or adding React developers to a team.

What does a React development company do?

A React development company builds user interfaces and full applications with React, usually with Next.js for routing and server rendering, TypeScript for reliability, and a Node.js, Python or .NET back end behind it. Services include product design, front-end and full-stack development, migration of legacy front ends to React, performance work, and dedicated React developers for existing teams.

React is a library, not a framework; the choices around it (Next.js versus Vite, state management, data fetching, hosting) decide how the product performs. See Next.js vs React, React vs Vue vs Angular and Svelte vs React.

The Stack Overflow Developer Survey 2024 reports React as the most used front-end framework among professional developers, which keeps hiring and long-term maintenance practical for clients.

Next — Next.js apps. Server-rendered, fast, indexable..

SPA — React SPAs. Dashboards and internal tools..

Full — Full-stack. Node, Python or .NET behind React..

Mig — Migrations. Angular, jQuery or legacy to React..

Hire — Dedicated developers. React engineers for your team..

RN — React Native. Mobile from the same skills..

React development services

Projects we are most often asked to build.

React and Next.js web application development

SaaS products, customer portals, marketplaces and dashboards built in React with Next.js, TypeScript and a scalable back end; see web app development.

React website development

Marketing sites and content platforms in Next.js or Astro with React components, server-rendered for SEO and Core Web Vitals; see custom website development.

Front-end modernization

Migrating AngularJS, jQuery, Backbone or server-rendered templates to React incrementally, route by route, without a big-bang rewrite.

Design systems and component libraries

Reusable React component libraries with Storybook, tokens and accessibility built in, shared across products.

Dedicated React developers

Senior React and Next.js engineers embedded in your team, US time zones, monthly engagement; see hire dedicated developers.

React Native mobile apps

iOS and Android apps sharing skills and code with the web product; see React Native app development.

iOS and Android apps sharing skills and code with the web product; see React Native app development.

Key features and components

What separates a useful build from a costly one.

React development: key components
Feature	Why it matters
TypeScript throughout	Fewer runtime bugs, safer refactors
Next.js App Router	Server rendering, streaming, Server Components
Component library	Consistent UI, faster features
Automated testing	Jest, Testing Library, Playwright
Accessibility (WCAG 2.2)	Usable by everyone
Performance budgets	Core Web Vitals on every release
CI/CD	Preview deployments, safe releases
Observability	Sentry, analytics, logs

Common integrations

Where the value usually comes from.

Common integrations
System	What we connect
Back ends	Node.js (NestJS, Fastify), Django, .NET, Laravel
Auth	Auth0, Clerk, NextAuth, Cognito
Data	PostgreSQL, Prisma, TanStack Query
Payments	Stripe, Braintree
CMS	Sanity, Storyblok, headless WordPress, Payload
Hosting	Vercel, Cloudflare, AWS

Standards and quality

React products are only as good as the engineering discipline around them.

We follow the official React documentation and Next.js documentation patterns, including Server Components where they reduce client JavaScript.
Accessibility to WCAG 2.2 AA is tested with axe and manual keyboard and screen-reader checks.
Security follows the OWASP Top 10; dependencies are scanned and updated on a schedule.
Performance is measured against Core Web Vitals in CI and after launch.

How we deliver react development — Server rendering with Next.js is decided per route at architecture time, which is what keeps React products fast and indexable.

Our react development process

We define the product and architecture, design the interface and components, build in two-week sprints with automated tests and previews, integrate your systems, deploy with CI/CD and stay on for support, or embed React developers in your team from day one.

How much does React development cost?

As US planning figures, a React or Next.js marketing site costs $20,000-$80,000, a React web application $50,000-$250,000, and a dedicated senior React developer $12,000-$18,000 a month (mid-level $8,000-$13,000). See website development cost and app development cost.

React development cost ranges (planning figures)
Scope	Typical range	Timeline
React / Next.js website	$20,000-$80,000	6-12 weeks
React web application (MVP)	$50,000-$120,000	3-4 months
React SaaS product (first release)	$120,000-$250,000	4-8 months
Dedicated senior React developer	$12,000-$18,000 per month	Monthly

Technology we typically use

Mainstream, maintainable choices.

Technology we typically use
Layer	Choice
Front end	React 19, Next.js, TypeScript
State and data	TanStack Query, Zustand, Server Components
Styling	Tailwind CSS, CSS Modules, shadcn/ui
Testing	Jest, Testing Library, Playwright
Back end	Node.js, Django, .NET
Hosting	Vercel, Cloudflare, AWS

Mistakes to avoid

Common causes of overruns and low adoption.

Building a public site as a client-only SPA and losing search visibility.
Choosing libraries by fashion rather than maintenance.
No TypeScript on a product meant to last.
Skipping a component library and rebuilding the same UI repeatedly.
Ignoring bundle size until users complain.
Hiring React developers without a product owner or architecture.

Fast — React. Server rendering, budgets..

Hosted — React. Vercel, Cloudflare, AWS..

Staffable — React. Largest talent pool..

Why choose Progression Agency for react development?

Engineering, design and go-to-market in one team.

Product design, React engineering and growth marketing in one team.
Next.js expertise from architecture to hosting, in your accounts.
Dedicated developers who work in US hours and your tools.
You own the code, data and accounts.
Headquartered in New York City, working nationwide.

See Next.js development company, front-end development company, hosting for React and Next.js, web development frameworks and hire app developers.

Ready to scope it?

Tell us the users, workflow and systems involved. We will propose a first release and planning estimate.

Get a proposal

Getting found in search

AI, AEO and what is changing

Paid media and lead generation

Websites and design

Choosing and working with an agency

Software and app development

Web development, platforms and hosting

Social, content and brand

By industry and by situation

Frequently asked questions

What is a React development company?

An agency that designs, builds, deploys and maintains web applications and websites using React, usually with Next.js and TypeScript, and supplies React developers to teams.

Is Progression Agency a React JS development company?

Yes. As a React JS development company we build React and Next.js applications and websites, migrate legacy front ends to React and supply dedicated React developers, from our New York City headquarters to clients nationwide.

What React development services do you offer?

Next.js and React web apps, React websites, front-end modernization, design systems, dedicated React developers and React Native mobile apps.

How much does it cost to hire a React development company?

Projects commonly run $20,000-$80,000 for sites and $50,000-$250,000 for applications; dedicated developers $8,000-$18,000 a month.

Can I hire a dedicated React developer?

Yes, senior and mid-level React and Next.js engineers on monthly engagements, embedded in your team.

Do you use Next.js?

Yes, for most public-facing products; Vite for internal tools and embedded interfaces.

Is React good for SEO?

With Next.js server rendering or static generation, yes; a client-only React app is weaker.

Can you migrate our Angular or legacy front end to React?

Yes, incrementally, route by route, so the product keeps shipping during the migration.

Do you build the back end too?

Yes, in Node.js, Python (Django, FastAPI) or .NET, or we integrate with your existing APIs.

Which hosting do you recommend for React apps?

Vercel for Next.js products, Cloudflare for static sites, AWS for scale and compliance.

Do you use TypeScript?

Yes, on every product meant to last.

Can you build a mobile app with the same team?

Yes, in React Native, sharing components and skills with the web app.

How do you ensure quality?

TypeScript, automated tests, code review, preview deployments, accessibility and performance checks in CI.

Who owns the code?

You do; repositories, hosting and accounts are in your name.

How long does a React project take?

6-12 weeks for a site, 3-8 months for an application, depending on scope.

Where are your developers?

Progression Agency is headquartered in New York City with a US-based team.

Do you work with startups?

Yes, from MVPs to scaling products; see MVP development.

Do you offer React consulting?

Yes: architecture reviews, performance audits and technical due diligence.

How do I start?

Send a brief or an existing repository; we return a written proposal.

Need software built?We design, build and support custom software, web apps and SaaS platforms, with a written scope first.

Get a software proposal

Get a free marketing proposal

Tell us what you are trying to grow and we will come back with a plan, not a pitch deck. Same-day reply on weekdays.

React Development Company | React.js Development Services & Dedicated React Developers