Szymon Chmal
Szymon Chmal

Building the tools
I wish I had
for React Native.

A digital garden where I share my journey building developer tools to help create better React Native apps.

Read journal GitHub

Engineering journal

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Read Building Rozenite: The injection

Building Rozenite: The injection

Injecting custom DevTools panels into Metro's debugger frontend.

• 6 min read
React
Rozenite
Read Building Voltra: Renderer

Building Voltra: Renderer

How we dropped react-reconciler to build a custom, stateless renderer that converts React Native JSX into native widgets.

• 11 min read
React
Voltra

Open Source

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Harness

Harness

Run Jest-style tests for TurboModules directly in real native environments without mocking.

React Native
Testing
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Rozenite

Rozenite

A comprehensive plugin framework for React Native DevTools, enabling real-time debugging with plug-and-play panels.

React Native
DevTools
View Rozenite
Voltra

Voltra

Build dynamic iOS Live Activities and interact with the Dynamic Island using JSX directly from React Native.

React Native
SwiftUI
iOS
View Voltra

Featured Talks

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Why a Design System Wasn’t Enough for AI-Generated UI

AI Coding Summit Berlin

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

reactCon

JSX to Live Activity: The Story of Voltra

React Native Connection 2026