Callstack Engineers

@callstackio

Mobile AI Lab. We train specialized models & build tools for agentic mobile development: @apex__ai + @agent_device. Hosting @AgentConf. React Native experts.

Wroclaw, Poland

callstack.com

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Callstack Engineers
@callstackio
Sep 1
🎉 @margelo_com Joins Callstack to Advance High-Performance React Native Engineering Vienna, Austria. 1 September 2026. Callstack, a leader in React Native and cross-platform development, today announced that Margelo, the Vienna-based high-end engineering company behind Nitro
Marc
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Callstack Engineers
@callstackio
20h
Introducing Appduct: Call your app functionality from the outside, instantly. Appduct doesn't use accessibility information or vision. It integrates directly into your app. More setup, instant interactions. Works with Swift, Kotlin & React Native. incubator.callstack.com/appduct/
Szymon Chmal
@ChmalSzymon
23h
Your E2E test isn't slow because of the thing you're testing. It's slow because of the login, the onboarding, the cookie banner, and the cart you rebuild tap by tap every single run. Call `seedCart(3)` instead. Start the test at the part that matters. incubator.callstack.com/appduct
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Callstack Engineers
@callstackio
23h
Teams can share plenty of code and still run iOS and Android as separate products. Where does new mobile work land by default, and who owns the native exceptions? React Native at Scale 2026 looks at how experienced teams make that call 👉 clstk.com/4hpke31
Callstack Engineers
@callstackio
Sep 22
We’re excited to share this one: the Agent Conf talks are live on YouTube. A huge thank you to every speaker who helped us shape this conference. Watch Agent Conf on YouTube 👉clstk.com/4hIGiG7 Which talk are you starting with?
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Callstack Engineers
@callstackio
Sep 22
Your engineers shouldn’t have to ration intelligence. We control Apex’s full pipeline: training, evaluation, and EU-hosted deployment. When a better open-weight model arrives, we can test, tune, and roll it out within days. Here’s how it changed the way we ship software ↓
Michał Pierzchała
@thymikee
Sep 22
What would you build if you stopped worrying about tokens? In the @AgentConf keynote: how we went from chatting with agents to running software factories. We train, evaluate, and self-host our model Apex for a team of 200+. SOTA on React Native. Used daily for everything else.
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