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Brownfield

Brownfield development represents the journey of gradually adopting React Native within established native mobile applications. Discover strategies, best practices, and real-world examples of successful brownfield migrations that allow teams to leverage React Native while preserving existing native investments.

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From Brownfield Complexity to AI-Supported React Native Migration

Explore a structured, AI-supported approach to adding React Native to native apps without breaking startup or packaging flows.

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Handling Navigation in React Native Brownfield Apps

Learn how to connect React Native and native navigation using a typed bridge with @callstack/brownfield-navigation.

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Announcing: React Native Brownfield v3 with Expo Config Plugin

Use React Native Brownfield v3 and Expo to migrate native apps incrementally with artifact-based integration for iOS and Android.

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Introducing Brownie: Type-Safe Shared State for React Native Brownfield Apps

A type-safe shared state library for React Native brownfield apps. Brownie syncs native and React state from a single TypeScript schema.

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Vega Developer Meetup

Learn how to integrate React Native into Android TV apps at the Vega Developer Meetup. Workshop, roadmap, and community talks, live in Munich.

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Scaling React Native at Zalando: How Brownfield Migration Paid Off

Discover how Zalando scaled React Native across a massive e-commerce app, from internal buy-in to brownfield rollout, and what they learned.

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React Everywhere: Bringing React Into Native Apps

Most teams use React on the web but still rely on native code or WebViews in their mobile apps. This talk explores how React Native can replace WebViews with minimal effort, allowing React to power both web and mobile.

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React Universe Meetup, New York

Join us in NYC or online for React Universe Meetup: tech talks, real-world insights, and networking with React Native devs. June 24, 2025.

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Adding React Native to iOS and Android Apps Has Never Been Easier

Learn how to easily add React Native to your iOS and Android apps with a modern brownfield setup powered by Callstack’s open-source tooling.

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You Don’t Need a Rewrite, You Need React Native Brownfield

Discover how modern React Native Brownfield integration enables cross-platform power in native apps, without rewriting from scratch.

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Powering Native Apps with React Native Brownfield

Discover how React Native Brownfield makes it easier to blend React Native features into native apps without full rewrites or heavy migrations.

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Using React Native in Existing Apps for Faster Cross-Platform Features

Learn how to use React Native in existing apps to speed up cross-platform development without a full rewrite. Watch the expert-led webinar now.

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Adding React Native to existing apps?

We help teams introduce React Native into brownfield projects effectively.

2×Estimated AI-assisted delivery speedupJetBrains
25Working days from kickoff to mergeJetBrains
1Plugin across three frameworksJetBrains
10min from code change to mini-app releaseTeamworks
multi-dailystaging deployments instead of weekly releasesTeamworks
7mini-apps supported in one modular mobile platformTeamworks
2CI/CD lanes for mini-app and host-app distributionTeamworks
2xgrowth in mobile user base during the migration periodAutoZone
4.2 -> 4.7app rating increase after migrating to React NativeAutoZone
0missed releases during the transition to React NativeAutoZone
33%fewer re-renders across most featuresQuestrade
18%faster time-to-interactiveQuestrade
-28%CPU usage in critical trading flowsQuestrade
78%bundle size reduction (from 50 MB to 11 MB)Dream11
30%faster component mount time after render optimizationDream11
60%faster initial load time enabled by switching to HermesDream11
5xfaster message sending timeExpensify
4.5xfaster search screen loading timeExpensify
#1SEO rank, recovering from 3-9AutoZone
260kBless in blocking JS payloadAutoZone
2–5xfaster feedback loopAutoZone
2.8xincrease in knowledge over 8 weeks (25% → 71% assessment scores)Hello Fresh
15developers trained across web and native backgroundsHello Fresh
86%of devs self-rated their knowledge as 3/5 or higher after training (up from 0%)Hello Fresh
130%increase in users post-upgrade7cups
63%adoption rate; majority of attendees registered in the appReact Universe App
67%of attendees connected through QR badge sharingReact Universe App
45%created personalized badges to showcase identity and goalsReact Universe App
49%of attendees onboarded before day one, arriving ready to networkReact Universe App

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