

Szymon Chmal
Incubator Lead at Callstack

Creator of Rozenite, Harness and Voltra. The kind of person who dives into code and somehow makes the "impossible" happen. Focused on building the next generation of developer tools so you can ship your apps even faster.
How I Hacked React Native DevTools (And Built a Plugin Framework)
What if React Native DevTools could be extended with your own custom plugins?
That question is what led me to build Rozenite. I started by digging into how React Native DevTools work under the hood, reverse-engineering the architecture, and looking for a way to add custom functionality without forking anything.
In this talk, I'll share that journey: why I built Rozenite, how it hooks into DevTools, and how it turns that idea into a real plugin framework. We'll look at building custom panels with React-based UIs, communicating with the app, running plugin code safely, and what becomes possible when React Native DevTools are no longer a closed box.
React Native performance on low-end devices
We've all seen it: an app that feels smooth on a flagship phone, but tells a very different story on an older Android device. Screens take too long to open, lists stutter, animations drop frames and users immediately sense that something is off.
This roundtable is a space to share those stories: the surprising bottlenecks, the debugging rabbit holes, the trade-offs, and the fixes that actually worked. We'll talk about real experiences with startup time, memory limits, rendering performance, navigation, images, profiling tools, and the gap between "works on my phone" and "works for everyone".
Bring a performance war story, a hard-earned lesson, or a problem you're still trying to solve.
