React JS Development
React JS Development Services
We build React front ends that load fast, stay readable as they grow, and can be picked up by your own developers later. Web apps, dashboards, SaaS products and customer portals, written in TypeScript with Next.js or Vite, tested before they ship.
Trusted by product, analytics and growth teams
React app, first release
Typical plan- 011 week
Scope
Written scope and per-feature estimate
- 021–2 weeks
Design and architecture
Screens, stack decisions, repo and CI
- 033–5 weeks
Build
Staging link, demo every sprint
- 041 week
Test and harden
Browser, accessibility and speed checks
- 05Few days
Launch
Production release with monitoring
Typical durations for a focused first release. Your plan is set after scoping.
- 01Ship a working first release in weeks, with a staging link from the first sprint.
- 02Keep pages fast with measured Core Web Vitals, not a guess at launch.
- 03Own a typed, tested codebase with a component library your team can extend.
- What it is
- Design and build of web apps and front ends with React
- Typical timeline
- 4–8 weeks to a first release, 3–6 months for a full product
- Core stack
- React, Next.js, TypeScript, Node.js, Playwright
- How we engage
- Fixed scope, monthly team, or dedicated developers
Services
React JS development services we offer
Some clients need a whole product built. Others need two senior React developers for a quarter. Both are fine.
- 01
Custom React web applications
Single-page and multi-page apps built around your workflows: booking systems, internal tools, marketplaces, customer accounts. We agree the screens and data first, then build in small releases.
- 02
Next.js and server-rendered React
Marketing sites, content platforms and e-commerce fronts that need SEO and quick first paint. We use the App Router, server components and caching where they help, and plain client rendering where they do not.
- 03
SaaS front ends and dashboards
Data-heavy interfaces with tables, filters, charts and role-based views. We pay attention to loading and empty states, because that is where dashboards usually feel broken.
- 04
UI component libraries
A documented set of buttons, forms, tables and layouts in Storybook, matched to your design system, so new screens are assembled instead of redrawn.
- 05
Migration to React
Move from AngularJS, jQuery, older class-based React or Create React App to a current setup. We migrate page by page behind the same URLs, so the product keeps working throughout.
- 06
React Native mobile apps
iOS and Android apps that share logic and types with your web app. Suitable when you need both platforms and do not need heavy native graphics.
- 07
Performance and code audits
We profile bundle size, rendering and network calls, then give you a ranked list of fixes with the expected gain for each. You can have us fix them or hand the list to your team.
- 08
Maintenance and team extension
Dependency upgrades, bug fixes and new features on a monthly plan, or developers who join your stand-ups and work in your repository.
What we build
React projects and the stack behind them
The right setup depends on what the app has to do. This is how we usually choose.
Process
How we run a React project
Short cycles and a working link every week. You should never wonder what was done.
- 01
Scope
We go through goals, users, screens and integrations, and return a written scope with an estimate per feature.
- 02
Design and architecture
Wireframes or your existing designs, plus decisions on rendering, state, data fetching and hosting written down with reasons.
- 03
Build in sprints
One or two week sprints. Each ends with a demo on staging and a short note on what shipped and what is next.
- 04
Test and harden
Cross-browser and device checks, accessibility pass, performance budget, and security review of auth and data handling.
- 05
Launch and iterate
Production release, monitoring, and a list of improvements based on what real users do.
What you get
What you own when we finish
Everything is in your repository from the first commit. Nothing is locked to us.
Source code in your Git
TypeScript throughout, linted and formatted, with a README that gets a new developer running locally in minutes.
Tests and CI
Unit tests for logic, component tests for key UI, and end-to-end tests for the flows that make money, all running on every pull request.
Component library and docs
Storybook with every shared component, its props and its states, plus notes on folder structure and conventions.
Deployed app with monitoring
Production and staging environments, error tracking, and Core Web Vitals reporting so regressions are visible.
Best fit
Who this is for
Founders building a first product
You have a clear idea and need a team that can take it from screens to a launched app.
SaaS teams short on front-end capacity
Your back end is ahead of your UI and the roadmap is slipping.
Companies with a legacy front end
The current app is slow to change and hard to hire for, and a rewrite has to happen without downtime.
Teams that need a design system
Every screen looks slightly different and building new ones takes too long.
We are probably not the right choice if
- You need a simple brochure site. A website builder will be cheaper and quicker.
- You want the lowest hourly rate and are happy to manage quality yourself.
- The app is a graphics-heavy game or needs deep native device features.
Engagement models
Three ways to work with us
Pick the one that fits how certain your scope is. You can switch between them as the product matures.
01
Fixed scope
4–8 weeks
A defined first release or a migration with clear edges.
- Written scope and fixed quote
- Weekly demo on staging
- Tests and CI included
- Handover with documentation
02
Product team
3–6 months
A product that will keep changing as users give feedback.
- Developers, designer and QA
- Sprint planning with your lead
- Monthly billing, flexible scope
- Roadmap reviewed each month
03
Dedicated developers
Month to month
Your team needs more React hands on an existing codebase.
- Works in your repo and tools
- Joins your stand-ups
- Full-time or part-time
- Scale with a month's notice
Durations are typical, not commitments. Estimates rise with unclear designs, many third-party integrations and unstable APIs, and fall when designs and endpoints are ready before the build starts.
Why work with Multivariate on React
This website and our own tools are built with React and Next.js, so the practices we recommend are the ones we live with. We also build the data and API side, which means front-end decisions are made with the whole system in view.
- 01TypeScript, tests and code review are standard on every project, not extras.
- 02We set a performance budget at the start and measure against it each sprint.
- 03You get a staging link in the first sprint and a demo at the end of each one.
- 04The code and infrastructure are in your accounts from day one.
FAQ
React JS development questions
Ask us directlyWhat do React JS development services include?
Planning, UI design or design implementation, front-end development in React, API integration, testing, deployment and maintenance. We can also build the back end and APIs if you need a full product team.
How much does it cost to build a React application?
Cost depends on the number of screens, integrations, and how complex the logic is. A focused first release is a few weeks of work for a small team. Larger SaaS products run for several months. We give a per-feature estimate after scoping so you can choose what goes into the first release.
How long does a React project take?
A first usable release typically takes 4 to 8 weeks. A full product with accounts, billing and admin tools usually takes 3 to 6 months. Dedicated developers can start within a couple of weeks.
Should we use Next.js or plain React?
Use Next.js when pages need to rank in search, load fast on first visit, or mix content with application features. A Vite-based single-page app is simpler and works well for tools that sit behind a login. We recommend one after seeing your requirements.
Can you migrate our existing application to React?
Yes. We move it in stages, usually route by route, so the old and new code run side by side and users are not disrupted. We start with the screens that change most often, because that is where the benefit shows first.
What is the difference between React and React Native?
React builds web interfaces that run in a browser. React Native uses the same component model to build iOS and Android apps with native UI. Teams often share business logic, types and API clients between the two.
Can we hire dedicated React developers from you?
Yes. Developers can join your team full-time or part-time, work in your tools, and follow your process. You can scale the team up or down with a month's notice.
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