
Mobile AI Lab. We train specialized models & build tools for agentic mobile development: @apex__ai + @agent_device. Hosting @AgentConf. React Native experts.
Wroclaw, Poland
Joined August 2016
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Callstack Engineers@callstackioOct 21
Poland
PolandConnected via WebAccount-level information, not a live location or per-post device.
An enterprise team we worked with moved React Native adoption from <10% to about 30% while feature delivery continued. The model: migrate screen by screen, keep stable native flows in production, package React Native as native artifacts. Read case study: clstk.com/3TLyWcY

Callstack Engineers@callstackioOct 20
Poland
PolandConnected via WebAccount-level information, not a live location or per-post device.
Checking an invitation panel means recreating the invitation every time.
With Appduct, an AI agent can call a function your team writes to trigger the panel with test data, wait until it’s ready, and inspect the UI.
See how: clstk.com/4smYoCo

Callstack Engineers@callstackioOct 20
Poland
PolandConnected via WebAccount-level information, not a live location or per-post device.
Put @apex__ai on a React issue from your backlog 🔎 It currently ranks #2 in ReactBench’s Fixing React category: finding and fixing problems in existing code while preserving behavior. Try it in your repo: clstk.com/3VJmM4Z

Callstack Engineers@callstackioOct 20
Poland
PolandConnected via WebAccount-level information, not a live location or per-post device.
What evidence would make you comfortable shipping an agent’s changes?
Join us in Amsterdam on Oct 22 for three talks with speakers from Callstack, @expo, @jetbrains, and Chromatic.
Sign up here 👉 luma.com/i8wkxgyg

Callstack Engineers@callstackioOct 19
Poland
PolandConnected via WebAccount-level information, not a live location or per-post device.
The printed report is out in the wild. Want a digital copy now, before you catch us in person? Download it at clstk.com/47MgFj7
React Native at Scale 2026 draws on conversations with 12 organizations and a decade of our React Native work.

Callstack Engineers@callstackioOct 19
Poland
PolandConnected via WebAccount-level information, not a live location or per-post device.
Turn mobile designs into working features with a lower-cost AI model.
@thymikee will explain the verification loops behind a rise from 60% to 98% of PRs merged on the first attempt in the workflow he’ll present.
Oct 22 · Amsterdam · Save your spot: clstk.com/3WynEcJ

Callstack Engineers@callstackioOct 16
Poland
PolandConnected via WebAccount-level information, not a live location or per-post device.
Keep control of what ships when agents write your UI.
Craig Walker and @KasperPeulen explore how to steer and verify agent-generated UI with Storybook’s agent-native CLI and WebStorm’s design-to-browser workflows.
Save your spot at clstk.com/4BbFhz5

Callstack Engineers@callstackioOct 15
Poland
PolandConnected via WebAccount-level information, not a live location or per-post device.
Keep app iteration fast as your project grows.
@cedric_dev will demo agents verifying changes in parallel on cloud simulators with Expo and EAS, returning evidence for human review.
📆 Oct 22 · Amsterdam · Save your spot: clstk.com/4zxtfye

Callstack Engineers@callstackioOct 15
Poland
PolandConnected via WebAccount-level information, not a live location or per-post device.
Dubai, thanks for joining us at DevDay Exchange Community with our CEO and Codex Ambassador @grabbou and @OpenAIDevs!
We’re planning community demos at the next meetup. Building with Codex or the @OpenAI API? Join our WhatsApp group for updates ➡️ chat.whatsapp.com/DWdJlI0bdD…

Callstack Engineers@callstackioOct 15
Poland
PolandConnected via WebAccount-level information, not a live location or per-post device.
Agent retries add up 📈 In our React Native evals, @apex__ai scored 87.8% on task requirements; Claude Opus 5.5 scored 88.6%. Apex’s lower estimated model cost leaves more room to iterate. Try it on a task from your repo: clstk.com/4s8cyab

Callstack Engineers@callstackioOct 15
Poland
PolandConnected via WebAccount-level information, not a live location or per-post device.
Give a React Native component its own window on Meta Quest.
The Meta VR Layout SDK keeps it in the same React tree, with props and context intact. Watch both counters update, then build your own second panel:
More on our blog: clstk.com/4dGqgeA







