React Native Developer Claude Skill: JSI, Expo & FlatList

Name: React Native Developer AI Skill - Cyprian
Brand: KissMySkills
Price: 19 USD
Availability: InStock

React Native Developer, Cyprian AI skill by KissMySkills, cover

React Native Developer AI Skill - Cyprian

Find out whether your React Native bug lives in JavaScript, the bridge, or native code before you touch a line.

$19 this skill one payment yours forever

Claude skill package instant downloadcyprian-react-native-cross-platform-engineer.skill

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How it works

Ask it something hard.

📎 cyprian-react-native-cross-platform-engineer.skillLOADED ✓

React Native list screen: 60fps on iOS, 25fps on Android, same code, Hermes on. What's different under the hood?

CLAUDE · WITH THIS SKILL Same JS, different floor - Android renders through more layers and mid-range hardware exposes what an iPhone hides. First split JS-thread from UI-thread drops in Perf Monitor: JS at 25fps means bridge/JSI churn, usually inline functions and fresh objects created every render feeding a FlatList - fix keyExtractor, memoize renderItem, add getItemLayout, and the Android number typically doubles. UI thread low means overdraw or heavy elevation shadows - flatten the item view. And confirm you're profiling a release build: dev-mode Android runs 2-3x slower and fools everyone. Which thread shows the drop?

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Questions before you buy? A person answers, usually the same day: hello@kissmyskills.com

// the file itself

Read it before you buy it.

The first lines of the file your AI will read, exactly as delivered. Nothing rewritten for the page.

// the skill your AI runs on

You are Cyprian, a Senior React Native Engineer who locates a symptom on the JS side, the bridge, or the native side before touching FlatList or Hermes. You have been activated to ship one codebase to both app stores.

Drop Cyprian into Claude and get a Senior React Native Engineer who has shipped consumer and enterprise apps to both app stores from a single JavaScript/TypeScript codebase, and who knows exactly where that promise of "write once, run anywhere" breaks down and what to do when it does. Cyprian does not treat React Native as "web development that happens to run on a phone." He treats it as a bridge architecture problem: JavaScript and native code are two separate runtimes that must communicate efficiently, and most of the performance and stability bugs that show up in production trace back to that boundary being crossed too often, too slowly, or without cleanup. Cyprian covers the full React Native lifecycle: architecture decisions (bridge versus JSI, Fabric, TurboModules), Expo versus bare workflow tradeoffs, writing and debugging native modules that call into Swift or Kotlin, navigation and state management choices, performance diagnosis and fixes (re-render storms, FlatList tuning, Hermes engine behavior), over-the-

SKILL.md · 270 lines · instant download

// what's inside

What's inside this skill

Bug isolated to JavaScript, the bridge or native code
Profiling walkthrough with the right tool for each layer
Fix plan with the specific code changes to make
Performance checklist for list rendering and re-renders

React Native developers and mobile leads chasing freezes across the JS-native boundary.

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Trademarks of their respective owners. KissMySkills is not affiliated with or endorsed by them.

// ask your assistant

Or let your AI set up this skill for you.

Go to kissmyskills.com/pages/connector and set up the "React Native Developer AI Skill - Cyprian" skill (handle: cyprian-react-native-cross-platform-engineer-ai-skill) for me

Paste it into Claude, ChatGPT, Claude Code, Cursor or Codex. Your AI walks you through connecting KissMySkills (about 3 minutes, 7-day free trial) and loads the skill. What your AI will read →

What you're actually buying

Find out whether your React Native bug lives in JavaScript, the bridge, or native code before you touch a line.

Cyprian is a Senior React Native Cross-Platform Mobile Engineer skill built for the specific place React Native projects go wrong: a bridge/JSI boundary crossed too often or without cleanup, an Expo-versus-bare decision made out of habit instead of a real constraint, a FlatList tuned by guesswork instead of a profile, and an OTA update that quietly promises to ship a native change it can't. He covers the Old-versus-New Architecture split (bridge, JSI, Fabric, TurboModules), native module bridging to Swift and Kotlin, React Navigation and state management choices, FlatList/FlashList performance tuning, Hermes engine behavior, EAS Update (expo-updates) rollout strategy, and app store submission mechanics.

Who it's for

mobile engineering leads, React Native developers, and teams shipping a single JavaScript/TypeScript codebase to both the App Store and Play Store.

Key capabilities

States which side of the JS-native boundary a symptom lives on (pure-JS re-render, bridge/serialization, or native-side) before proposing any fix.
Confirms Old versus New Architecture (newArchEnabled, RN version) before diagnosing anything bridge-related.
Decides Expo managed, Expo prebuild, or bare workflow on the actual native capability or constraint forcing the decision, never "bare to be safe."
Tunes FlatList performance (getItemLayout, keyExtractor, windowSize) or recommends a FlashList migration only after profiling with React Native DevTools or the React DevTools Profiler.
Routes JS-only fixes to EAS Update (expo-updates) and native changes to a full store build, stating which bucket a change falls into before promising a same-day OTA fix.

How to use it

Paste Cyprian's SKILL.md into your Claude Project Instructions (or any AI system prompt), then describe your react native cross-platform engineer problem. Works with Claude, ChatGPT, and any AI chat. Under 2 minutes to install.

// how to install Under 2 minutes

Four steps. Any AI chat.

01
Download the file
After checkout, the download link lands in your inbox. Save the .skill file: Claude takes it as it is.
02
Open your AI chat
Any AI chat you already use: Claude, ChatGPT, Gemini, Grok, Copilot or another.
03
Add it to your AI
Claude: Settings → Capabilities → Skills, upload the .skill file. ChatGPT, Gemini and others: open the .skill file like a .zip archive and paste SKILL.md into custom instructions or Project instructions.
04
Start working
Your AI is now configured as a specialist. Ask it anything inside its domain.

No technical knowledge required.

With Library there is nothing to download. Connect your AI once, then just ask: "Load React Native Developer AI Skill from KissMySkills."

Setup guide → Library · $9/mo →

// faq

Questions about this product

What AI tools does this work with?+

Any AI chat that accepts custom instructions - Claude, ChatGPT, Gemini, and others. Paste the SKILL.md content into your project instructions or system prompt.

How do I install it?+

Download the file, paste its full contents into your AI's custom instructions, project instructions, or system prompt field. Takes under 2 minutes.

Is this a course or a tool?+

It's a tool - a structured expert persona and workflow, not a video course. You use it immediately by pasting it into your AI chat.

Why does Cyprian ask whether I'm on the Old or New Architecture before touching a bridge bug?+

Because the legacy bridge (async JSON serialization) and the New Architecture (JSI, Fabric, TurboModules) behave differently enough that a fix for one can be irrelevant or actively wrong for the other. Cyprian checks newArchEnabled and the React Native version before diagnosing anything bridge-related.