React Universe Summit | June 23, 2026

Hello New York City! React Universe Conf is morphing into React Universe Summit. New city, new format, and even sharper focus on trends emerging in React Native and AI Engineering today. We’ll host a one-day deep dive for 200+ CTOs, VPs Eng, Heads of Mobile: real KPI stories on scaling React Native (brownfield wins, super apps, infra at scale, AI impact, security, future bets). Speakers from leading tech companies. High-impact networking in the room where enterprise RN decisions happen. Join us on June 23, 2026. Tickets & partnership spots open 👇clstk.com/4b2J8SF

Join us at Callstack x @vercel AI SDK Meetup in Wrocław 👉 clstk.com/4rmA7uQ 📅 March 4, 6 PM [CET]

Free on March 4? Join us in Wrocław for the Callstack x @vercel AI SDK Meetup and listen to: 🔹@ChmalSzymon on safe AI execution with the Vercel stack. 🔹@zaiste & @typeofweb on vibe-coding real commerce with Claude. 🔹@dom_sipowicz on shipping reliable agents. Sign up now ➡️ clstk.com/4tqvK3g

This Thursday in Berlin, we are holding the React Universe Meetup x Zalando. A few spots are still available if you want to join us! Sign up here & see you on January 29: clstk.com/4sUdfE9 🔵 Building a Video Experience with React Native: Lessons from Early Adoption by Eugene Verichev (@Zalando) 🔵 LLM inference on-device in React Native: the practical aspects by @artus9033 (@callstackio) 🔵 How to Optimize your health with React Native by @tejask (@IBM ) 🔵 Performance comparisons in Brownfield React Native projects by Mohit Karekar (@Zalando)

7:45 PM at React Universe Meetup x Zalando: Performance comparisons in Brownfield React Native projects by Mohit Karekar

7:20 PM at React Universe Meetup x Zalando: How to optimize your Health with React Native by @tejask

Next week in Berlin: React Universe Meetup x @Zalando! What’s on our agenda? Talks cover video performance and the new RN architecture, practical on-device LLM inference, using React Native and fitness trackers to optimize our health and performance comparisons in Brownfield. Expect practical lessons, real tradeoffs, and time to connect after the talks. Sign up here & join us on 29 January: clstk.com/49J42Wn

Have you saved your spot at the React Universe Meetup x @Zalando yet? @tejask is joining us in Berlin on Jan 29! See the full agenda & sign up ⬇️

Happy New Year everyone! Let’s kick off the 2026 event season. 🔥 First stop: React Universe Meetup x @Zalando in Berlin on Jan 29. Come by if you enjoy in-person events - it’s going to be tech-talk heavy but fun. RSVP: clstk.com/4suY4ky We’re also looking for speakers, so apply now to take the stage at @Zalando’s headquarters: clstk.com/4soAqWN

OTA: centralized hotfix tool or decentralized deployment? @adam_mruk (@Klarna) uses it as a fire extinguisher for critical bugs. @Zackary_Chapple (@zephyrcloudio) argues for Module Federation, giving teams deployment power across the full stack ⬇️

We played the newlyweds game with @cedric_dev, @tido64, & @DelphineBugner. What we learned? ➡️ Everyone hates class components. ➡️ Build fix horror stories: "wrote my own CLI" & "unplugging the external screen". ➡️ Don't put everything in one `index.ts` file! Full game ⬇️

"The biggest performance issue in React is just rendering too much". @jmeistrich argues the real bottleneck in RN isn't lists, it's state. React's top-down render isn't performant by default. His fix: a signal-based system where components subscribe only to the state they need ⬇️

Tired of rewriting CSS for React Native? @huxpro introduces Lynx, a framework-agnostic engine. It features native CSS support (port web CSS directly) and a two-thread model (BTS/MTS) for better hybrid UI. He also discusses React as a spec & community Vue/Svelte ports ⬇️

Node-API for React Native wasn't built in a weekend. Khalef Hosany (@Microsoft) & @kraenhansen (@MongoDB) detail the community effort, from a Windows-specific prototype to a public standard. They discuss "nerd sniping" & why they need your feedback now ⬇️

React Native is 10 years old, but stability is the new hot topic. @chris_trag & @moyessa (@Amazon) argue stable core just means more expansion (TVs, AR, Web). This puts a huge burden on library devs. They explain why brownfield is the real path to adoption ⬇️

Meet Uniwind! @jpudysz (@codemaskcom) discusses his new, blazing-fast styling library for Tailwind fans in React Native. He explains why he built it, how it shares the same core as Unistyles (which isn't going away!), and the power of JSI ⬇️

How do you teach an AI to write better code? @fernandorojo (@vercel) shares how he uses his own talk slides to train AI on composition. PLUS, he gives the scoop on the upcoming native v0 app and his AI-driven workflow ⬇️