Szymon Chmal

Szymon Chmal

Software Developer

Passionate React developer with experience in Next.js, Astro, Angular, and Node.js, always eager to explore new technologies. Public speaker with 24+ talks on web performance and accessibility, making complex topics engaging. Founder of Google Developer Groups Toruń, dedicated to knowledge sharing, mentoring, and improving the web.

What I’ve been shipping

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Introducing Rozenite: A Plugin Framework for React Native DevTools

Build custom debugging panels inside React Native DevTools with Rozenite: a modular, TypeScript-ready plugin framework with full device-scoped support.

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Why Knowing Your App’s Bundle Contents Matters for React Native Performance

Learn why your React Native app’s bundle size matters & how tools like Expo Atlas help you optimize performance, reduce app startup time & improve dependency management.

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What's New in Next.js 15

Tune in to our breakdown of everything new in Next.js 15, from React 19 and React Compiler support to Turbopack and secure Server Actions.

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Rozenite: The Missing Part of React Native DevTools

Learn how Rozenite hooks into DevTools to enable clean, custom plugin development, restoring the extensibility devs loved in Flipper.

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Building React Native App for Vega OS

React 19.2 brings <Activity> and useEffectEvent, new ideas for React state management arrive, and Vega OS debuts as a React Native-powered Linux OS.

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Live Dev Session: React Universe Conf, RN 1.0, Expo Updates & More

In Week 37 of our Live Dev Session we talked about React Universe Conf with guest Szymon, ranted about AI, explored what React Native 1.0 really means, reviewed Expo updates, and covered the latest moves in the React Native ecosystem.

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How I Hacked React Native DevTools (And Built a Plugin Framework)

Learn how React Native DevTools work under the hood, and how to inject custom plugins with clean hooks and no forks.

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Live Dev Session: Rozenite DevTools Plugins Framework, Precompiled React Native for iOS, TanStack DB 0.1

Discover Rozenite: DevTools framework for React Native, faster iOS builds, on-device AI, and key updates from this week’s livestream.

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How I Hacked React Native DevTools (And Built a Plugin Framework)

Learn how React Native DevTools work under the hood, and how to inject custom plugins with clean hooks and no forks.

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Live Dev Session: Breaking Down Vercel Ship 2025

Tune in to developer reactions to Vercel Ship 2025, from AI sandboxes and bot detection to smarter compute pricing and microfrontends.

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Master JavaScript Performance in React Native (Part 2)

Learn to fix JS performance issues in React Native-from debounce bugs to Redux selectors, in this hands-on webinar with real code examples.

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I Built a File-Based Router for React Native

A deep dive into building a file-based router for React Native using Metro’s hidden APIs, dynamic routing, loading states, and smart hacks included.

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Master JavaScript Performance in React Native (Part 1)

Watch Callstack's webinar on React Native JS performance. Learn to fix bottlenecks, leaks & FPS issues from the 2025 Ultimate Guide authors.

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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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LynxJS: First Impressions, Live Coding & What’s Under the Hood

We’re checking out LynxJS for the first time! Join us as we test it out, see how it works, and share their thoughts.

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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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Astro – Island Technology in the Name of Optimization

Next.js is the default choice, but Astro offers strong competition in some areas. Let's compare their features and differences.

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Join us

Join the team building the React Universe

We’re a team of trusted React and React Native contributors who care deeply about great code, Open Source, and solving real-world problems together.