Callstack Engineers @callstackio
We ship cross-platform products at AI speed. Training LLMs (Apex). React Native Core Contributors & React Foundation Members. Bringing you @AgentConf. callstack.com Wroclaw, Poland Joined August 2016-
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Read the article here👇 clstk.com/4vzOJZj
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Vibe coding can get you to working fast. It can also get you to messy architecture, hidden bugs, and runaway token spend even faster. We wrote down 5 practical lessons from building with AI coding agents: ✔️stay in control ✔️scope tighter ✔️know your stack ✔️describe the data first ✔️watch the cost Learn more from the article👇 Link in the comments
Callstack Engineers retweeted
Coming with your team? Group tickets for Agent Conf are 15% off. Use Discount code "Teams15" for 3+ tickets. Compare notes, pressure-test ideas, and learn from other people building with agents. Get tickets: agent.sh/tickets
@jaisadarsh123 @brandtnewlabs @aidenybai Connects to React DevTools and reads optimized text format with top offenders (saving tokens). Also reads logs from the device. Also reads CPU profile from the sim. Also identifies dropped frames.
Callstack Engineers retweeted
This is what mobile performance optimization looks like in 2026. Powered by agent-device 👇
I didn't guess at any of this: 🤖 I profiled every regression on real devices with @callstackio's agent-device: frame timing, CPU, and memory 👨⚕️ I held the codebase to a 100/100 health score with @aidenybai's react-doctor. 🧪 Pure tick functions, 95% test coverage.
Callstack Engineers retweeted
→ agent-device works with iOS 17 → codex can now disable Liquid Glass for me → zero screenshots made, all through a11y info
If you missed WWDC today, here's our summary of what's new for On Device AI. Includes timestamps so you can watch the keynote yourself! 🎥
I put everything what's new into this article ⬇️ callstack.com/blog/on-device…
Callstack Engineers retweeted
agent-device-hub 🔜
Callstack Engineers retweeted
Wake up babe it's shipping week 🐑 Lots of updates for on-device AI from Apple. I think I'll drop this from @ReactSummit stage on Friday! 🔥
Callstack Engineers retweeted
React Native gets new features from day 1 #wwdc
We've been building the Apple Intelligence layer for React Native for a year now. Exciting to see the platform move in this direction, and even more exciting to help React Native teams start using it through one familiar API. Big update coming this week 🔥
Huge update to Apple Intelligence ✅ - Image inputs - Skills - Server models Can't wait to drop this for y'all this week to test! Let's go! 🔥
Callstack Engineers retweeted
See you in Paris in September 👋
And today’s the day of @satya164, creator of React Navigation, React Native Paper, and much more. Needless to say, he is one of the most impactful contributors to the RN ecosystem. 📆 Paris, September 24 👉 reactnativeconnection.io
We optimized self-hosted Gemma 4 31B for Apex, our specialized React Native coding model. The setup: vLLM, two-GPU tensor parallelism, KV cache tuning, context limits, and MTP speculative decoding. The result: up to 2.48x higher output-token throughput. Read more 👇 Link below
agent-device to take your app from 15 to 120fps 👇
Thanks @callstackio's agent-device 🙌
Callstack Engineers retweeted
Moonlighting as an Expo employee in my spare time
Second on the stage @Baconbrix talking about what’s possible with serve-sim for agents front rolling mobile app with Browser Use
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