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Aleksandra Desmurs-Linczewska

Software Engineer @ Callstack

What I love most about Callstack is the constant opportunity to grow.

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Software Developer @ Callstack

If you're focused on development, Callstack will support and challenge you.

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Finance & Administration Manager @ Callstack

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React forms the foundation of modern web and mobile development with its component-based architecture and declarative approach. Master React's core concepts, from hooks and state management to performance optimization techniques that apply across both web and React Native applications.

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Writing Custom Renderers for React

Learn how React renderers work, why RNTL needed a new test renderer, and what it takes to connect React Reconciler to a host environment.

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Building iOS Live Activities With React: Inside Voltra

Learn how to build iOS Live Activities and Dynamic Island experiences using pure JSX, no Swift or native code required.

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From React Native Web to React Strict DOM

Nicolas Gallagher (Meta) explains how React Strict DOM evolved from React Native Web, providing a shared syntax that compiles to native or web with zero overhead.

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React Foundation: New Governance Model for React and React Native

Seth Webster, Executive Director of the React Foundation, details its new governance model, Meta's role, and how partners like Callstack and Microsoft will ensure stability and scale.

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Exploring TanStack Ecosystem: From React Query to TanStack Start

Tanner Linsley breaks down TanStack’s evolution-from React Query to Start, and why client-first React apps still matter in today’s full-stack landscape.

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Create React App is Out: Exploring Alternatives & Community Proposals

CRA is now deprecated, so we explore other options for starting web React projects, going through Vite, TanStack Router, Parcel, and Rsbuild to check the developer experience.

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State of React 2024 Breakdown

Let's take a deep dive into the long-awaited State of React survey from 2024; brace yourselves for a two-hour ride.

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How to Get Started With 3D in React

Learn how to implement 3D in React apps, learn more about top libraries like React Three Fiber, and dive into WebGPU's future.

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The Complete Developer Guide to React 19, Part 3: Upgraded Support

Learn how React 19's new features enhance SEO, page performance, and custom elements support for better, faster web applications.

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Welcome to the React Universe

This is the Keynote talk presented at React Universe Conf 2024, the largest community conference that unites developers and thought leaders to explore trends, share insights, and push the boundaries of React and React Native.

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The Complete Developer Guide to React 19, Part 2: New Enhancements

Discover React 19's key updates, including improved `ref` usage, error reporting, and context consumption in part 2 of this practical developer guide.

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The Complete Developer Guide to React 19, Part 1: Async Handling

Explore the key features of React 19 beta, focusing on new hooks that enhance async handling, state management, and form submissions.

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We support teams building scalable apps with React and React Native.

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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