Hire React experts for your next project
From core feature work to performance optimization, our team can support your React application wherever it's needed—design systems, rendering pipelines, architecture and more.
Why React is the right foundation for your frontend?
React is trusted by companies like Meta and Microsoft to build everything from dashboards to multi-surface platforms. It gives teams the flexibility and control they need to scale quickly—without sacrificing performance or DX.
Easy to get started
React’s declarative model makes it easy to describe complex UIs with predictable behavior—helping teams ship features faster, with less room for error.
Easy to get started
React’s declarative model makes it easy to describe complex UIs with predictable behavior—helping teams ship features faster, with less room for error.
Composable ecosystem
Whether you're using Next.js, Vite, or your own build setup, React integrates cleanly with modern tooling for routing, data fetching, testing, and CI.
Composable ecosystem
Whether you're using Next.js, Vite, or your own build setup, React integrates cleanly with modern tooling for routing, data fetching, testing, and CI.
Maintainable at scale
React supports gradual refactors, shared patterns, and architectural boundaries—so your app and your team can grow without slowing each other down.
Maintainable at scale
React supports gradual refactors, shared patterns, and architectural boundaries—so your app and your team can grow without slowing each other down.
Building modern education platform with a custom React architecture for Eedi
Eedi, a teaching and homework platform used by UK schools, partnered with Callstack to rebuild their product from scratch using a React-first approach. We helped design a scalable architecture, implement a shared design system, and build fully custom components to meet complex classroom use cases.
What are the things you should look out for?
React gives you a flexible foundation, but at scale, complexity builds fast. Without strong structure and shared practices, it’s easy for apps to slow down, grow inconsistent, or become hard to maintain.
State Management
As apps grow, local state and ad-hoc context stop scaling. Without a clear data layer, teams duplicate logic, misuse React Context, or introduce untracked async flow—leading to bugs and slowdowns.
Unnecessary re-renders
Performance bottlenecks often stem from deeply nested components, unstable props, or unoptimized render paths. Without profiling and memoization, UI responsiveness suffers.
Component Composition
Lack of shared patterns leads to inconsistent behavior, visual drift, and duplicated effort. Teams often reinvent the same components in parallel.
Security
React apps that deal with forms, auth, and user input are vulnerable to issues like XSS or CSRF. Many teams miss hardening around third-party dependencies or browser APIs.
Testing Coverage
As the codebase grows, flaky or missing tests slow confidence and releases. Without consistent unit, integration, and E2E layers, regressions slip through easily.
Integrations
Integrating with legacy systems, APIs, or third-party services requires consistent contracts. Without abstraction or standardization, errors and breakages become hard to trace and debug.
The Complete Developer Guide to React 19
React 19 introduces powerful new primitives to improve async workflows, error boundaries, and state management. This guide breaks down the most impactful changes—starting with async handling using hooks.
- Learn how to handle async logic with use and Suspense for seamless UI updates
- Use Actions to simplify form submissions and server mutations
- Improve perceived performance with built-in transitions and streaming rendering
Hands-on engineering support for React teams
Build new application with React
We help design architecture, ship core features, and implement scalable UI patterns—delivering stable foundations for fast-moving product teams.
Improve performance of an existing React app
Clean up state management, simplify component structure, and resolve performance issues caused by re-renders, prop drilling, or ad hoc context usage.
Ship faster with our expert engineers in your team
We work as part of your team—pairing on delivery, improving DX, and guiding decisions around architecture, testing, and long-term maintainability.
Extend React to a new platform
Run your React components on mobile, desktop, and other platforms using tools like React Native, Expo Router, or Electron.
Why leading companies work with Callstack
Meta Official Partners
We are official Meta partner for React Native, co-organizers of React Conf and hosts of React Universe Conf.
Working at scale
We know how to make React Native work at enterprise scale, both technically and organizationally.
React Native Core Contributors
We don’t just use React Native to build cross-platform apps, we help shape it for millions of developers.
Team at scale
We’re a team of 200+ engineers ready to start fast and scale with your needs.
Enterprise-friendly
We hold ISO certifications and follow strict security standards to make onboarding smooth and compliant.
Wide range of services
As a partner for your full application lifecycle, we offer a full range of services around React and React Native.
FAQs
Bringing React into large teams or mature products often raises important technical questions. Here’s how we typically support teams through different stages of delivery and scale.
Yes. We regularly embed with teams during critical phases—launching, scaling, or stabilizing complex apps.
We pair with your engineers, handle delivery together, and often support platform or architecture tracks.
Yes. We help uncover root causes—architecture, testing, performance—and improve delivery pace with hands-on engineering.
Absolutely. We’re often responsible for owning specific domains or refactors while collaborating closely with product and design.
We do. We help teams align testing layers with architecture, and set up CI pipelines that reflect how code is actually used.
We’re comfortable designing boundaries, supporting shared packages, and working in monorepos with complex ownership and coordination needs.
We’re built for integration. We can typically kick off within days and begin adding value immediately.
Need help with React?
Let’s talk about your app goals and React stack. Together, we’ll define a path to better performance, developer experience, and maintainability.
