I prefer a feature-based structure: separate folders for screens, components, services, hooks, and state (store). Keep shared UI in a components library, isolate native integrations, and add tests and types alongside features. This keeps the app modular and easier to scale and onboard newcomers.

I focus on avoiding unnecessary renders (useMemo/useCallback), using FlatList/SectionList with proper keys and getItemLayout, enabling Hermes where appropriate, and offloading heavy computation to native modules or background threads. Profiling and targeted fixes are key.

I prefer encapsulating native code behind a small, well-documented JS bridge. For most needs I use the community modules; for custom APIs I create lightweight native modules in Swift/Kotlin and expose them via NativeModules or TurboModules when needed, with clear fallbacks for each platform.

I pick tools to fit the app: for small apps I use Context + hooks and local component state; for medium to large apps I prefer Redux Toolkit or MobX with selectors, normalized state, and persistence (redux-persist). I prioritize predictable flows and testable logic.

I use TypeScript, strict typing and linters, add unit and integration tests, and capture runtime errors with tools like Sentry. CI runs automated tests and E2E suites (Detox/Appium) to catch regressions early.

I use reliable local storage solutions (Realm, WatermelonDB, or SQLite) with optimistic UI updates, background synchronization, and clear conflict-resolution rules to ensure a smooth offline experience.