Callstack Engineers

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Callstack Engineers

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 Katılım Ağustos 2016
391 Takip Edilen16.7K Takipçiler
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Callstack Engineers
Callstack Engineers@callstackio·
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, safely and at scale. This is our new manifesto.
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Michał Pierzchała
Michał Pierzchała@thymikee·
Expensify is automating their app performance work with AI loops using @agent_device - you can do it too
Callstack Engineers@callstackio

Agents reason about code well, but they lack proper tooling to see results of code changes running live on a device. Integrating agent-device into the development loop gives the agent hands and eyes on devices and simulators, so they can reproduce bugs, record the proof, measure performance, and profile renders on its own. We wrote about how Expensify uses agent-device to do that. Read the article here 👇

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Callstack Engineers
Callstack Engineers@callstackio·
Agents reason about code well, but they lack proper tooling to see results of code changes running live on a device. Integrating agent-device into the development loop gives the agent hands and eyes on devices and simulators, so they can reproduce bugs, record the proof, measure performance, and profile renders on its own. We wrote about how Expensify uses agent-device to do that. Read the article here 👇
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Callstack Engineers
Callstack Engineers@callstackio·
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
Callstack Engineers@callstackio·
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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Michał Pierzchała
Michał Pierzchała@thymikee·
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
Callstack Engineers@callstackio·
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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Michał Pierzchała
Michał Pierzchała@thymikee·
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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Agent Conf | Sept 17-18, 2026 | Warsaw
Agent Conf | Sept 17-18, 2026 | Warsaw@AgentConf·
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. 🔹Orchestration and Multi-Agent Systems What changes when the work starts moving across multiple agents, tools, and steps. 🔹Adoption and Case Studies What teams learned once agent workflows met deadlines, constraints, reviews, and production code. Agent Conf is built around the work teams are doing now. Join us in Warsaw on September 17-18, 2026. Get your ticket: agent.sh/tickets
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Szymon Chmal
Szymon Chmal@ChmalSzymon·
Nothing to see here. Just me playing with a watchOS app written in React ⚛️
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Callstack Engineers
Callstack Engineers@callstackio·
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
Callstack Engineers@callstackio·
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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Keşfet

@reactnavigation @agent_device @thymikee @lukebfarrell @expo @kentcdodds @TejasKumar_ @dabit3