Jakub Stadniczuk

💻 @callstack, Lego and tennis fan after work

[Rafael Mendiola @GroundControl]

Firehose, our AI engineering platform, is the enjoyable place for teams that want to go dangerously fast and be confident on the quality of their software.

If you want to be an early adopter join our list here: https://t.co/pPZk5fEpv1

[Mike @grabbou]

We've spent 10 years migrating companies to React Native. Earlier guides focused on traditional brownfield migrations.

AI makes greenfield and hybrid paths more realistic. Agents can inspect native behavior and recreate existing flows.

In this guide, we break down how it works ⬇️

[Rafael Mendiola @GroundControl]

We’re planning something special in Mexico City this fall. 🇲🇽

On October 27, we’re hoping to bring together React and AI developers for a tech meetup timed with Mexico Tech Week and Día de Muertos.

The idea is simple: bring great developers together, invite some interesting speakers, and give people from outside Mexico a chance to experience one of the most exciting tech communities in the world.

If you’ve been looking for an excuse to visit Mexico City, meet Mexican developers, and spend a few days talking about React, AI, and what we’re all building, this might be a pretty good one.

We’re collecting interest now as we put the event together.

🇲🇽 Interested in joining us? Sign up here:
https://t.co/rZQlLBU8SU

And if you know React or AI developers who might want to come, please send this their way.

[Michał Pierzchała @thymikee]

We cut the agent loop in half without making it slower.

Old: snapshot → act → snapshot → act → …
New: snapshot → act --settle → act --settle → …

⊙ 30% fewer steps
⊙ 50% less variance
⊙ Same total time
⊙ Fewer tokens

@agent_device just got a lot more reliable

[Jakub Stadniczuk @kubastad]

Wrapping up the 17-hour trip home from @ChainReactConf (thanks for cancelling my flight KLM). Worth every hour though. Great catching up with the community, meeting old and new friends and hearing what everyone’s been building. Can’t wait for the next one!

[Jakub Stadniczuk @kubastad]

@GroundControl @watchful_toast I guess ill have to work on my posing game 🤣 or at least bend my knees next next time

[Matt Hargett @syke]

Pleased to announce I’m working with Callstack as a consulting Principal, and I’ll be with them at @RenderATL and speaking at the Boston meetup. If anyone wants to meet up and chat about what cross-platform tech and OSS collaboration means in the new operating reality of AI, hit me up!

[Michał Pierzchała @thymikee]

agent-device mentioned by @ccheever ❤️

watch @ChainReactConf live: https://t.co/33PRSlvubE

[Jakub Stadniczuk @kubastad]

Super excited to be at @ChainReactConf again this year! If you’re attending, stop by the Callstack booth.

@grabbou and @ChmalSzymon will be running demos of Apex, our React Native-specialized model, Agent Device, and a few other things they’ve been cooking up. Come say hi👋

[Mike @grabbou]

And here we are! Boarding flight to Portland! 🛫

[Jakub Stadniczuk @kubastad]

@GroundControl See you there Rafael!

[ROFI @bidah]

https://t.co/iP1i1gXb4w is the most revolutionary technology that had happened to React Native since Expo. Is that good. It's for UI and Logic too. Any issue that arises through testing the app will show up in the server logs that the agent will fix too. Any UI issue can be caught by screenshots. I do not do manual testing on my apps anymore up until the end of the app creation process. On that point I do manual testing but even then all findings are passed to the agent that will use agent device AGAIN to fix those. INSANE.

[Michał Pierzchała @thymikee]

React Native Evals are out with a bunch of new models:

→ Sol only slightly better at 3x cost compared to Terra or Grok 4.5.
→ Muse Spark 1.1 feels like OpenAI's fourth model in terms of perf vs cost
→ Grok 4.5 scores 12 pp higher than Grok 4 at 4x less cost

[Hur Ali @hurali97]

Part 3: MAUI(xamarin) 🤝 React Native

Brownfield integrations always require sharing data like user profiles and tokens. But syncing state across frameworks can quickly turn into a nightmare.💥

Watch @callstack/brownie handle it seamlessly using a folly c++ store 🎥👇

[Szymon Chmal @ChmalSzymon]

Nothing to see here. Just me playing with a watchOS app written in React ⚛️

[Mike @grabbou]

Another great case study of Module Federation in React Native. How you can improve your DX and cut release time with @repack_rn ⬇️

[Jakub Stadniczuk @kubastad]

@SzymonRybczak @theo @o_kwasniewski Love the hoodies! 🔥

[Michał Pierzchała @thymikee]

run Maestro tests 2x faster on Android with this tool

» 𝚊𝚐𝚎𝚗𝚝-𝚍𝚎𝚟𝚒𝚌𝚎 𝚝𝚎𝚜𝚝

[Mike @grabbou]

Founder mode = activated. Setting up first round of discovery calls with companies that signed up for Apex beta.

If you missed it - do it now! ⬇️

LFG! 🔥

[Margelo @margelo_com]

We just released react-native-runtimes! 🥳
👉 Render React components on separate JS Runtimes
👉 Share state (Zustand) across Runtimes, synced in C++
👉 Dual-Thread-approach for rendering/business logic
We plugged this into MetaMask which made the app start substantially faster: