IoT Firmware & BLE Component Research Engineer (Wearable Integration)

We are seeking an experienced embedded systems and BLE research engineer to help identify and document off-the-shelf Bluetooth Low Energy optical heart rate sensor modules or pods that support open, unencrypted data broadcasting. Project Scope: We are developing a local microcontroller integration (ESP32 / M5StickC) that communicates directly with wearable sensor pods. We need an engineer to research, analyze, and compile a technical comparison report of existing market-available optical sensor pods (such as Nordic-based or similar wearable modules) to determine: Which devices natively support the standard Bluetooth SIG Heart Rate Service (UUID 0x180D). Which devices expose raw RR-interval (HRV) data payloads in their BLE broadcast packets without requiring a proprietary companion app or cloud handshake. Technical feasibility notes on integrating these modules into a custom local BLE client architecture. Deliverables: A structured technical report/matrix comparing 3 to 5 candidate sensor modules based on their BLE protocol openness, SDK availability, and data packet structures. Recommendations for the best component path forward for local hardware prototyping. Required Skills: Bluetooth Low Energy (BLE) / GATT architecture Embedded Systems & Firmware Analysis IoT Device Integration & Component Research