Wearable Device Firmware Diagnostics Engineer (Nordic nRF / RTOS / PixArt / Android Integration)

𝗢𝘃𝗲𝗿𝘃𝗶𝗲𝘄 We are looking for an experienced embedded firmware engineer to help diagnose and resolve stability, reliability, and performance issues in an existing wearable device platform. This is an established product with existing hardware and firmware. We are specifically looking for someone who excels at low-level firmware diagnostics, embedded troubleshooting, and system-level debugging in complex real-world devices. Our platform is a ruggedized wearable subsystem integrated into a custom Android-based device. The wearable hardware is built around Nordic Semiconductor nRF series MCUs and includes BLE connectivity, RTOS-based firmware, power management systems, and optical biometric sensing using PixArt sensor technology. Because this firmware operates as part of a larger Android ecosystem, experience with Android device integration, BLE communication with Android applications/services, and debugging interactions between embedded firmware and Android systems is highly valuable. Experience working with PixArt biometric/heart rate sensors or similar optical sensing systems will be weighted heavily in candidate selection. 𝗥𝗲𝗾𝘂𝗶𝗿𝗲𝗱 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 Strong hands-on experience with: • Nordic Semiconductor nRF series MCUs • Embedded C/C++ • RTOS-based firmware systems • Bluetooth Low Energy (BLE) • Low-power embedded design • Real-time firmware diagnostics and troubleshooting • Sensor integration and debugging • JTAG/SWD debugging environments • Oscilloscope and logic analyzer usage • Firmware logging, tracing, and root-cause analysis 𝗛𝗶𝗴𝗵𝗹𝘆 𝗗𝗲𝘀𝗶𝗿𝗲𝗱 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 We are especially interested in candidates with direct experience in: • PixArt optical biometric sensors • Heart rate / SpO2 sensing systems • Wearable device firmware • Motion artifact mitigation • Sensor calibration and signal quality analysis • Battery-powered products • Android platform integration • Android BLE communication stacks • Android services/background communication • Debugging Android ↔ embedded device interactions • OTA firmware update systems • Long-runtime stability investigations 𝗖𝘂𝗿𝗿𝗲𝗻𝘁 𝗔𝗿𝗲𝗮𝘀 𝗼𝗳 𝗜𝗻𝘃𝗲𝘀𝘁𝗶𝗴𝗮𝘁𝗶𝗼𝗻 Examples of issues we are actively diagnosing include: • Intermittent firmware instability • Unexpected resets or watchdog events • BLE communication reliability issues • Android connectivity or synchronization problems • Power consumption anomalies • Sensor data inconsistencies • RTOS timing or synchronization issues • Edge-case failures after extended runtime • Biometric sensor reliability and signal quality concerns The ideal candidate is someone who enjoys difficult debugging challenges and can systematically isolate root causes in embedded systems with multiple interacting components across both firmware and Android layers. 𝗪𝗵𝗮𝘁 𝗪𝗲 𝗡𝗲𝗲𝗱 𝗙𝗿𝗼𝗺 𝗬𝗼𝘂 Please include the following in your proposal: • Your experience with Nordic nRF platforms • Which RTOS environments you have worked with • Your experience with PixArt sensors or optical biometric sensing systems • Your experience integrating embedded devices with Android platforms • Examples of difficult embedded firmware bugs you have diagnosed • Experience with wearable or battery-powered devices • Your preferred debugging toolchain and workflow • Your availability and timezone • Whether you are available for ongoing support after the initial diagnostic phase 𝗘𝗻𝗴𝗮𝗴𝗲𝗺𝗲𝗻𝘁 𝗗𝗲𝘁𝗮𝗶𝗹𝘀 • Initial engagement focused on diagnostics and stabilization • Potential for long-term ongoing firmware work • Remote work is acceptable • NDA will be required • Strong English communication skills are important 𝗣𝗿𝗲𝗳𝗲𝗿𝗿𝗲𝗱 𝗔𝗱𝗱𝗶𝘁𝗶𝗼𝗻𝗮𝗹 𝗦𝗸𝗶𝗹𝗹𝘀 • Nordic SoftDevice or Zephyr RTOS experience • Android native development experience • Embedded Linux familiarity • Manufacturing test/debug support • Medical or regulated device exposure • Experience working with ODM/OEM partners • Git-based collaborative development workflows 𝗜𝗺𝗽𝗼𝗿𝘁𝗮𝗻𝘁 𝗡𝗼𝘁𝗲𝘀 This role is focused heavily on advanced troubleshooting and root-cause analysis. We are not looking for junior firmware developers or general software engineers. Please only apply if you have substantial hands-on embedded firmware debugging experience and are comfortable working directly with hardware, sensors, BLE communication layers, and Android-integrated embedded systems. Budget depends on demonstrated experience with Nordic, wearable systems, PixArt sensors, and embedded diagnostics.