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Senior React Native Performance Engineer

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Helpcare AI

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Location:
United States , San Francisco

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

100000.00 - 120000.00 USD / Year
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Job Description:

We are building a high-stakes mobile experience where "fast" is the baseline and "fluid" is the requirement. We need an engineer who is obsessed with the mechanics of mobile performance—someone who views a dropped frame as a bug and a 2-second loading state as a failure. You will be responsible for ensuring our app feels like a premium native product while handling complex, real-time financial data.

Job Responsibility:

  • Zero-Lag Navigation: Architect a 1-1 screen transition map (forward and backward) using Native Stack to ensure hardware-accelerated transitions
  • Frame Rate Optimization: Maintain a locked 60 FPS (or 120 FPS on ProMotion displays) across all lists and complex views
  • Crash Management: Implement and monitor rigorous error-tracking (Sentry/Crashlytics) to achieve a 99.9% crash-free rate, specifically debugging native-layer memory leaks and JS-thread hangs
  • Instant Updates: Engineer a sophisticated data-fetching strategy for "Mission Critical" info (Balance, Transactions, Recipients) that updates seamlessly when moving from background to foreground
  • Optimistic UI: Implement "Instant-Success" patterns for payments and profile updates, ensuring the UI reflects user actions before the server round-trip is complete
  • Cache Strategy: Design a robust local caching layer that eliminates loading spinners for returning users
  • Declarative Animations: Build physics-based, interruptible animations using react-native-reanimated that run exclusively on the UI thread
  • Gesture-Driven Design: Implement "Native-feel" interactions (swipe-to-action, pinch-to-zoom) that respond instantly to touch

Requirements:

  • Expert-level proficiency in react-native-reanimated, react-native-gesture-handler, and react-native-screens
  • Professional experience with TanStack Query (React Query) or SWR for managing server state, polling, and background refetching
  • Deep understanding of the React Native architecture (Bridge vs. Fabric) and the ability to write custom TurboModules in Swift or Kotlin
  • Proven experience optimizing large datasets using FlashList (Shopify) or highly optimized FlatLists
  • Mastery of Flipper, React DevTools, and iOS/Android native profilers
  • 3+ years experience
  • Skills: Android, iOS, React Native

Nice to have:

  • Experience in the Fintech or Mobile Money space
  • A portfolio that includes "Offline-First" applications
  • Contributions to the React Native Open Source ecosystem

Additional Information:

Job Posted:
February 13, 2026

Employment Type:
Fulltime
Work Type:
Remote work
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