Senior React Native Engineer

## About the role We're looking for a senior React Native engineer to own and push forward our mobile trading experience. The app is already in production: real users, real money, real-time markets. You'll be building new features, improving performance, and making sure the app feels fast and reliable across both platforms. This is a high-autonomy role. You'll make decisions about architecture, UX implementation, and how things ship. We don't have layers of process - you'll have direct context on the product and the freedom to move quickly. ## What you'll work on - Trading UI - Build and refine complex trading interfaces: order entry, position management, real-time price updates, and charting. - Navigation & Screen Architecture - Design and maintain screen flows using Expo Router (file-based routing), bottom tabs, top tabs, modals, and deep linking. - State Management - Work with Jotai atoms and TanStack Query to manage reactive app state, server state caching, and offline persistence. - Real-Time Data - Handle WebSocket connections for live market data, order fills, and position updates - including lifecycle management across app state transitions. - Performance - Keep animations at 60fps using Reanimated worklets, optimize list rendering with FlashList, and profile startup time and memory usage. - Graphics & Charting - Build and maintain candlestick charts and data visualizations using React Native Skia. - Authentication & Security - Work with Privy-based auth flows, biometric unlock (Face ID/Touch ID), passkeys, and secure credential storage. - Wallet & Blockchain Integration - Support multi-wallet architecture (Privy embedded wallets + Hyperliquid wallets), transaction signing, and cross-chain bridge flows. - Payments & Funding - Integrate fiat on-ramp/off-ramp (MoonPay), crypto deposits/withdrawals, and account transfers. - Build & Release - Manage EAS Build profiles, OTA updates via Expo Updates, and App Store / Play Store submissions. - Shared Packages - Contribute to monorepo packages consumed by the mobile app - UI components (Tamagui), constants, utilities, and the Hyperliquid SDK. ## What We're Looking For ### Must-have - 5+ years of professional mobile development experience, with at least 3 years focused on React Native. - Deep understanding of React Native internals - the bridge, Hermes, native modules, and platform-specific behavior on iOS and Android. - Strong proficiency in TypeScript and modern React patterns (hooks, context, concurrent features). - Experience with Expo managed and bare workflows, including EAS Build, Expo Router, and OTA updates. - Solid experience with state management in React Native - ideally Jotai, Zustand, or similar atomic/store-based approaches alongside TanStack Query. - Hands-on work with React Native Reanimated - UI-thread animations, gesture-driven interactions, shared element transitions. - Experience building and optimizing high-performance lists (FlashList, FlatList virtualization, scroll performance). - Comfort with native debugging - Xcode, Android Studio, Flipper, profiling tools, crash logs. - Experience with App Store and Play Store release processes, code signing, and distribution. - Strong instincts around mobile UX - responsive layouts, keyboard handling, haptic feedback, platform conventions. ### Nice-to-have - Experience with React Native Skia or custom canvas-based rendering for charts and visualizations. - Familiarity with Web3 / crypto - wallet management, transaction signing, interacting with on-chain APIs. - Experience with Privy, WalletConnect, or similar embedded wallet SDKs. - Hands-on experience with Tamagui or other cross-platform design systems for React Native. - Knowledge of WebSocket lifecycle management in mobile contexts (background/foreground transitions, reconnection strategies). - Experience with biometric authentication - Face ID, Touch ID, passkeys/WebAuthn on mobile. - Familiarity with push notifications setup and handling (Expo Notifications, APNs, FCM). - Experience with analytics and observability tooling - Sentry, Segment, or similar in a mobile context. - Exposure to monorepo tooling (Turborepo, pnpm workspaces) and API client code generation (Orval). - Familiarity with Hyperliquid or other DEX integrations. ## What you'll get - A small, high-output team where your work ships fast and matters - Direct ownership over backend systems - no waiting for approval chains - A modern TypeScript stack with good tooling already in place - The chance to build infrastructure for a growing crypto trading platform