Senior Mobile Engineer, BLE & Device Connectivity (iOS/Android)

Beacon Biosignals is building precision-medicine platforms for neurological, psychiatric, and sleep disorders. The Senior Mobile Engineer will develop and maintain native iOS and Android Bluetooth Low Energy (BLE) connectivity for EEG headbands and wearables, improving reliable data capture and exposing device capabilities to patient- and clinician-facing applications.

Responsibilities:

• Lead development of our native iOS and Android BLE device SDKs
• Own connection reliability, data throughput, and battery performance for device communication across a wide range of phones, OS versions, and real-world environments
• Partner closely with our Devices team on firmware interfaces, GATT profiles, and device behavior
• Expose device capabilities to our React Native applications through clean, well-tested native modules
• Own the observability of device connectivity, using telemetry and field feedback from real users to find and fix failure modes
• Help shape the roadmap and technical direction of our mobile platform
• Improve BLE pairing and reconnection reliability across both iOS and Android
• Increase streaming robustness for EEG data, including recovery from dropped connections and backgrounding
• Build the device-side support for a new in-app feature that validates EEG signal quality before data capture
• Add diagnostics that help our Clinical Operations team troubleshoot device issues in the field

Requirements:

• 8+ years of experience in mobile development, with extensive native experience on iOS (Swift) and/or Android (Kotlin)
• Hands-on experience integrating BLE peripheral devices into production mobile apps, including pairing/bonding, reconnection, background operation, and data throughput (e.g., Core Bluetooth, Android BLE APIs)
• Experience with sensor integration or streaming health data from wearables
• A rigorous approach to reliability: you care about edge cases, device fragmentation, and performance
• Strong communication skills and comfort working in a collaborative, async environment
• Built production React Native apps, or written native modules for React Native or Expo
• Worked with TypeScript and our broader stack (React Native, Expo, GitHub)
• Worked with medical devices, EEG, or wearables
• Worked on apps for clinical trials, patients, or another regulated environment
• Contributed to open source mobile or BLE projects