Callstack Engineers (@callstackio) / X

Callstack Engineers

4,355 posts

Callstack Engineers

@callstackio

We ship cross-platform products at AI speed. Training LLMs (Apex). React Native Core Contributors & React Foundation Members. Bringing you @AgentConf.

Wroclaw, Poland

Joined August 2016

Pinned
Callstack Engineers
@callstackio
May 26
When the way software is built changes, we help companies adopt it. For over a decade, that meant bringing React Native to production across mobile, web, desktop, and TV. Now we are expanding that same mission to AI-native engineering: helping teams ship software with agents,
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Callstack Engineers
@callstackio
36m
Zattoo’s React Native migration was not mainly about sharing code. It was about fixing the operating model around a multi-platform streaming product: release paths, team ownership, consistency, and platform expansion. Learn more from the webinar 👇 Link below
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Callstack Engineers
@callstackio
35m
Watch the full webinar 👇
From Native to React Native for TV: The Zattoo Case | Callstack
From callstack.com
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Callstack Engineers
@callstackio
1h
After a mobile agent writes the code, how does it verify the app? @thymikee and @lukebfarrell talk through the workflow and where @agent_device fits: simulator access, UI checks, logs, and a second QA pass when teams want it ⬇️
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Callstack Engineers reposted
Michał Pierzchała
@thymikee
16h
Remote iOS Simulator control from a Linux agent container. One command on the Mac: » agent-device proxy Here’s a remote Claude container connecting to my Mac through a cloudflared tunnel and controlling Maps on an iOS Simulator like it’s local.
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Callstack Engineers
@callstackio
16h
✅ works with remote Android emulators too
Michał Pierzchała
@thymikee
16h
Remote iOS Simulator control from a Linux agent container. One command on the Mac: » agent-device proxy Here’s a remote Claude container connecting to my Mac through a cloudflared tunnel and controlling Maps on an iOS Simulator like it’s local.
00:00
665
Callstack Engineers
@callstackio
22h
Users usually do not describe performance in engineering terms. They just say the app feels slow, heavy, or rough. That is why TTI and FPS still matter. They connect what users feel to what teams can measure and fix. We break that down in our performance guide ⬇️
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Callstack Engineers
@callstackio
22h
Get your copy ➡️
Improve Your React Native App Performance With a Few Tricks | Callstack
From callstack.com
201
Callstack Engineers reposted
Michał Pierzchała
@thymikee
23h
PSA: React Native Best Practices skill just got a big upgrade: → agent-first profiling via @agent_device and @callstack/inspector → version-aware RN, @expo, FlashList, Legend List → fewer misleading guidance and brittle benchmarks → smaller footprint » npx skills update
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Callstack Engineers reposted
Agent Conf | Sept 17-18, 2026 | Warsaw
@AgentConf
Jun 25
First speakers are in. Here are 4 themes they will be covering: 🔹Vibe Coding How people think, prompt, and iterate with agents while they build. 🔹Agentic Engineering Fundamentals Loops, memory, cost, failure modes, and the mechanics behind how these tools behave.
409
Callstack Engineers reposted
Szymon Chmal
@ChmalSzymon
Jun 24
Nothing to see here. Just me playing with a watchOS app written in React ⚛️
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52K
Callstack Engineers reposted
Agent Conf | Sept 17-18, 2026 | Warsaw
@AgentConf
Jun 24
Only 7 Early Bird tickets are left for Agent Conf. Once they’re gone, Regular tickets take over, and the price goes up from €553.50 to €676.50. Join @kentcdodds, @TejasKumar_ , @dabit3, @thekitze, @davidmokos_, and more in Warsaw on Sept 17-18. Tickets 👉
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Callstack Engineers
@callstackio
Jun 24
React Test Renderer is being deprecated. So what comes next for React Native Testing Library? @mdj_dev explains why RNTL needed a new test renderer and what building one reveals about Fiber, HostConfig, and React Reconciler. Learn more 👇 Link below
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Callstack Engineers
@callstackio
Jun 24
Read the article here 👇
Writing Custom Renderers for React
From callstack.com
252
Callstack Engineers
@callstackio
Jun 24
One of the biggest ASC CLI use cases is localization. @rudrank talks with @grabbou about using agents to translate app titles, subtitles, descriptions, and keywords, then apply those changes across locales without repeating the same App Store Connect work. Listen now🎧
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1.3K
Callstack Engineers
@callstackio
Jun 24
Listen to the latest episode here 👇
App Store Connect CLI, Agents, and Mobile Release Automation With Rudrank Riyam
From callstack.com
223
Callstack Engineers
@callstackio
Jun 24
Thanks for joining us, @mrousavy! Stay tuned for the episode in July ☀️
Marc
@mrousavy
Jun 23
Just recorded a new React Universe on Air podcast episode about VisionCamera with @grabbou - stay tuned for some Nitro & V5 insights 👀
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