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# JSX to Live Activity: The Story of Voltra


- **Date:** Thursday, Jul 9, 2026
- **Time:** 14:50–15:20 (30 min)
- **Room:** Stage 13
- **Event:** World Congress 2026 Europe

## Recording

[Watch recording](https://www.wearedevelopers.com/videos/100118-jsx-to-live-activity-the-story-of-voltra)

## Description

What if you could ship native iOS Live Activities and Dynamic Island experiences without writing a single line of Swift? This talk tells the story of Voltra, a library born from a viral tweet and a collaboration between Saul Sharma and Callstack to bridge the gap between React and native iOS extensions. We'll go behind the scenes of building a custom React renderer from scratch to translate JSX into SwiftUI primitives, bypassing the traditional "Swift wall." You will learn how we tackled the extreme technical constraints of the platform: from the tiny 4KB data limit to server-side driven UI that doesn't require a pre-shipped implementation. Join us for a deep dive into Voltra's architecture and learn how you can start shipping React to a brand-new platform today.

## Speaker

### [Szymon Chmal](https://www.wearedevelopers.com/@szymon-chmal)

React Native Expert at Callstack


## Related talks at this congress

- [Xcode development redefAIned](https://www.wearedevelopers.com/events/world-congress-2026-europe/sessions/1229-xcode-development) — MIlan Todorović
- [Swift, Server-side, Serverless](https://www.wearedevelopers.com/events/world-congress-2026-europe/sessions/1071-swift-server-side) — Sebastien Stormacq
- [Prompt, Render, Debug: AI-Powered React Development with Chrome DevTools](https://www.wearedevelopers.com/events/world-congress-2026-europe/sessions/1222-prompt-render-debug) — Suchitra Swain
- [Exploring Server Side Rendering](https://www.wearedevelopers.com/events/world-congress-2026-europe/sessions/1238-exploring-server) — Krasimir Tsonev