Mobile Lead Engineer (React Native) - US-based

Our client is looking for a Mobile Lead Engineer for a project focused on a cross-platform React Native app (iOS and Android) that discovers, pairs with, and controls BLE hardware. ● Native module integration: wiring a vendor-supplied Bluetooth SDK into React Native and handling the bridge cleanly. ● Cross-platform BLE identifier handling, where iOS exposes a per-pairing UUID and Android exposes the MAC address directly. ● Lock and unlock flows with hard timing constraints (sub-second response, short connection and validation windows). ● Over-the-air firmware updates to connected devices. ● Offline-first behavior: a pending-action queue that syncs when the device reconnects. ● Secure credential storage (iOS Keychain, Android Keystore), biometric auth, NFC, and QR-based device registration. ● Real-time device status: battery, firmware version, connectivity state. Must-haves ● Strong production React Native experience, with apps you've shipped to the App Store and Google Play. ● Comfort writing or integrating native modules (Swift/Kotlin) when the JavaScript layer isn't enough. ● Solid grasp of mobile state management, async flows, and the realities of debugging on physical devices rather than simulators. ● The instinct to handle edge cases and failure states up front, not after QA finds them. ● Fluent English and availability during US Eastern business hours. Big pluses: These aren't required, but they move a candidate to the top of the list; ● Bluetooth Low Energy (BLE) experience. Direct, hands-on work with BLE in a mobile app. If you've fought with connection timeouts, GATT services, pairing quirks, or platform identifier differences, say so. ● IoT apps in your portfolio. Apps that control or communicate with physical hardware. Tell us what the device was and what your app did with it. ● B2B / enterprise app experience over consumer apps. We'd rather see a multi-tenant admin tool, a field-operations app, or a hardware companion app than a high-polish consumer social app. The user base here is organizations and operators, not the mass market.