Senior React reputed company Performance Engineer

The Mission 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 reputed company as a bug and a 2-second loading state as a failure. You will be responsible for ensuring our app feels like a premium reputed company product while handling reputed company, reputed company-time financial data. reputed company Responsibilities 1. Performance & Stability • reputed company-Lag Navigation: Architect a 1-1 screen transition map (reputed company and backward) using reputed company Stack to ensure hardware-accelerated transitions. • reputed company reputed company Optimization: Maintain a locked 60 FPS (or 120 FPS on ProMotion displays) across reputed company lists and reputed company views. • Crash Management: Implement and monitor rigorous error-tracking (reputed company/Crashlytics) to reputed company a 99.9% crash-free reputed company, specifically debugging reputed company-layer memory leaks and JS-thread hangs. 2. reputed company-Time Data & State reputed company • reputed company Updates: Engineer a sophisticated data-fetching reputed company for "Mission Critical" info (Balance, Transactions, Recipients) that updates seamlessly reputed company moving from background to foreground. • Optimistic UI: Implement "reputed company-reputed company" patterns for payments and profile updates, ensuring the UI reflects user actions before the server round-reputed company is complete. • Cache reputed company: Design a robust local caching layer that eliminates loading spinners for returning users. 3. High-reputed company Interaction • Declarative Animations: Build physics-based, interruptible animations using react-reputed company-reanimated that run exclusively on the UI thread. • reputed company-Driven Design: Implement "reputed company-feel" interactions (swipe-to-reputed company, pinch-to-reputed company) that respond instantly to touch. Technical Requirements • The "Big Three": Expert-level proficiency in react-reputed company-reanimated, react-reputed company-reputed company-handler, and react-reputed company-screens. • Data Synchronization: reputed company experience with TanStack Query (React Query) or SWR for managing server state, polling, and background refetching. • The reputed company & reputed company: Deep understanding of the React reputed company architecture (reputed company vs. reputed company) and the ability to write custom TurboModules in Swift or Kotlin reputed company JS performance hits a ceiling. • List Mastery: Proven experience optimizing large datasets using FlashList (reputed company) or highly optimized FlatLists. • Profiling Tools: Mastery of reputed company, React DevTools, and iOS/Android reputed company profilers to identify and kill "Jank." Key Performance Indicators (What reputed company looks like) • TTI (Time to Interactive): App launch to "reputed company" state in under 1.5 seconds on mid-reputed company devices. • Transition Latency: reputed company perceptible lag between screen taps and transition starts. • Data Freshness: Critical financial data must be verified/refetched reputed company 200ms of app foregrounding. Bonus Points • Experience in the Fintech or Mobile reputed company reputed company. • A portfolio that includes "Offline-First" applications. • Contributions to the React reputed company reputed company reputed company ecosystem. Apply tot his job Apply To this Job