Unlock real code sharing across every platform
We work with large-scale teams to unlock true cross-platform code sharing—from mobile to web to desktop—by aligning architecture, tooling, and team structure around a single React-based stack.
Why code sharing is hard for large teams
Despite using React and React Native, many organizations struggle to share real code across platforms. Without a strong shared foundation, velocity and quality often suffer.
Fragmented build pipelines
Different platform targets—Web, iOS, Android or Desktop—require separate builds and configurations, breaking the promise of true reuse.
Fragmented build pipelines
Different platform targets—Web, iOS, Android or Desktop—require separate builds and configurations, breaking the promise of true reuse.
Inconsistent design and APIs
Without enforced cross-platform UI and logic contracts, teams drift apart and duplicate work instead of collaborating.
Inconsistent design and APIs
Without enforced cross-platform UI and logic contracts, teams drift apart and duplicate work instead of collaborating.
Code ownership
Feature teams own specific platforms, not features across them—making shared development an afterthought.
Code ownership
Feature teams own specific platforms, not features across them—making shared development an afterthought.
Unlocking true cross-platform code sharing for a global streaming platform
For a major global streaming brand delivering apps across TV, web, and mobile, we enabled true code sharing across six platforms—including Samsung Tizen, FireTV, and Android TV—using React Native.
By building a cross-platform foundation, we helped the client consolidate feature delivery and dramatically lower the cost of supporting new platforms in the future.
6+
TV platforms supported
3x
faster screen load time
Code sharing that accelerates delivery across platforms
A unified foundation built with React and React Native—enabling faster development and consistent features across web, mobile, desktop, and beyond.
Cross-platform architecture
Codebase that supports reuse across web, mobile, desktop, and TV—without duplicating code per platform.
Modular codebase
A well-structured app split into clear, composable modules—enabling multiple teams to build, test, and ship in parallel.
Consistent design and APIs
Shared interfaces, design tokens, and a reusable component library—delivered to help teams maintain UI consistency across platforms.
Unified tooling and workflows
Shared build, testing, and packaging infrastructure—reducing duplication and friction across platforms.
Feature-first collaboration
A team model focused on feature ownership over platform silos—enabling faster cross-platform delivery and better coordination.
Faster scaling to new platforms
Shared code means adding new platforms or features is faster, cheaper, and less error-prone in the future.
Share code across platforms with our open-source WebAssembly toolkit
With Polygen, you can run the same compiled modules—written in Rust, C++, or any WASM-compatible language—on both web and React Native. It’s a powerful way to extend code sharing beyond JavaScript.
Bring consistency and speed to your cross-platform codebase
Define a code sharing strategy for existing apps
We audit your current codebase and architecture to identify what can be shared, what should remain platform-specific, and how to evolve toward a more unified approach—without disrupting your roadmap.
Design for cross-platform scale from day one
For new initiatives, we help teams structure their architecture, UI systems, and tooling to support long-term code reuse across React and React Native—so scaling to new platforms never requires a rewrite.
Identify and align duplicated implementations
We locate redundant logic, mismatched features, or UI drift across platforms—and help teams consolidate them into clean, reusable modules with clear ownership.
Accelerate feature delivery through reuse
We work with your teams to shift new feature development toward shared components and logic—enabling faster rollout without requiring changes to legacy areas of the app.
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
Code sharing across platforms isn’t just a tooling problem—it’s architectural, organizational, and strategic. These are the most common questions we hear from teams trying to scale shared development across React and React Native.
Yes. We help teams introduce shared modules even in mature or inconsistent codebases—without rewriting everything or disrupting current delivery.
Often more than you think. With the right separation of logic, design tokens, and platform boundaries, teams share around 83% of business logic and UI components.
We identify where and why divergence happened—then align components and APIs where it adds the most long-term value, without forcing risky rewrites.
Yes. We help define shared ownership models and modular boundaries so teams can collaborate without blocking each other or introducing risk.
Absolutely. We’ve helped enterprise teams implement shared architecture across web, iOS, Android, macOS, Windows, and even TV platforms.
No. We focus on incremental wins—so you start reaping the benefits of code reuse on new features while keeping legacy code untouched.
We guide teams on creating stable shared APIs, versioning strategies, and ownership models—so reuse scales without becoming a point of friction.
Want to ship faster with shared React codebase?
We help engineering organizations align architecture and team workflows to maximize reuse across React and React Native—so you can move faster, reduce duplication, and scale with confidence.
