> Markdown version of [/@szymon-chmal](https://www.wearedevelopers.com/@szymon-chmal). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Szymon Chmal React Native Expert at Callstack building developer tools to bypass platform constraints. ## About Szymon Chmal builds developer tools as a React Native Expert at Callstack. He is the creator of Rozenite, Harness, and Voltra, focusing on making app delivery faster and solving complex engineering constraints. He leads the Toru艅 Web Development Meetup to help local engineers share knowledge. On stage, his talks cover everything from avoiding hype-driven development to building custom React renderers that translate JSX directly into SwiftUI. Szymon got his start in programming as a kid, driven by an early fascination with computer games. ## Past Sessions ### World Congress 2026 Europe 路 July 8, 2026 Berlin, Germany - [JSX to Live Activity: The Story of Voltra](https://www.wearedevelopers.com/videos/100118-jsx-to-live-activity-the-story-of-voltra) 路 30 min 路 馃帴 Watch recording ### World Congress 2024 路 July 17, 2024 Berlin, Germany - [Resistant to hype: How to avoid being deceived by technological trends?](https://www.wearedevelopers.com/videos/1136-resistant-to-hype-how-to-avoid-being-deceived-by-technological-trends) 路 30 min 路 馃帴 Watch recording ## Videos - [JSX to Live Activity: The Story of Voltra](https://www.wearedevelopers.com/videos/100118-jsx-to-live-activity-the-story-of-voltra) 路 Szymon Chmal - [Resistant to hype: How to avoid being deceived by technological trends?](https://www.wearedevelopers.com/videos/1136-resistant-to-hype-how-to-avoid-being-deceived-by-technological-trends) 路 Szymon Chmal ## Links - [X](https://x.com/ChmalSzymon) - [LinkedIn](https://pl.linkedin.com/in/szymon-chmal)