Senior Firmware Engineer - 8+yrs

8+ years of professional Embedded Firmware or Embedded Systems Engineering experience, with production experience shipping real products Expert-level C, with a strong grasp of memory models, ISR safety, and critical-section design on ARM Cortex-M Hands-on RTOS experience, with FreeRTOS required Direct experience with at least one Nordic BLE SoC (nRF52 or nRF53 series) and one STM32 microcontroller family Practical BLE experience: GAP/GATT, advertising/scanning, and a BLE stack such as Nordic SoftDevice or Zephyr Integration experience with at least one cellular (LTE/GSM) or satellite (Iridium-class) communication module Strong flash-memory background: flash filesystems, wear leveling, and bootloader/DFU design I2C/SPI/UART sensor driver development, from datasheet to production Comfortable using JTAG/SWD, logic analyzers, and oscilloscopes to root-cause intermittent field failures Bachelor's degree in Electronics, Electrical Engineering, Computer Engineering, or a related field, or equivalent practical experience Preferred: Experience with marine electronics, industrial IoT, or other harsh-environment or battery-powered products Underwater acoustic communications or DSP experience (FSK/PSK modulation, FFT/Goertzel demodulation, ARQ protocols) Satellite-IoT ingestion experience beyond Iridium Experience mentoring engineers or leading a small firmware team Working knowledge of AES or other embedded cryptography Responsibilities: Design, develop, and maintain firmware for Nordic nRF52/nRF53 BLE SoCs and STM32L4 microcontrollers across the SC2, GIGO, D&T, and Diver Tracking Buoy product lines Build and extend FreeRTOS-based task, queue, and mutex architectures, including safe ISR-to-task handoffs and critical-section design Own BLE stack integration and scan arbitration so multiple concurrent scan modes share a single radio without interfering with each other Integrate and maintain cellular, satellite, and GNSS connectivity, including store-and-forward and retry logic for unreliable links Implement marine and industrial communication protocols (NMEA 0183/2000, AIS, Modbus RTU, SDI-12, J1939) behind a portable hardware-abstraction layer Develop and debug I2C/SPI/UART sensor drivers, from datasheet to production, for pressure, IMU, temperature, and water-quality sensors Manage on-chip and external flash storage, EEPROM, and dual-bank bootloader/DFU update flows, and diagnose flash corruption or timing issues Implement and maintain encrypted device-to-server communication for field data transmission Apply and enforce internal coding standards through code review, and produce supporting technical documentation for releases Collaborate daily with PCB design, product, and cloud/server teams across India and the UK, and mentor junior firmware engineers Note: Please send Cv only, who can attend the interview weekdays, with short notice period (max 15 days only) Job Location: Mysore (work from office only) 8+ years of professional Embedded Firmware or Embedded Systems Engineering experience, with production experience shipping real products Expert-level C, with a strong grasp of memory models, ISR safety, and critical-section design on ARM Cortex-M Hands-on RTOS experience, with FreeRTOS required Direct experience with at least one Nordic BLE SoC (nRF52 or nRF53 series) and one STM32 microcontroller family Practical BLE experience: GAP/GATT, advertising/scanning, and a BLE stack such as Nordic SoftDevice or Zephyr Integration experience with at least one cellular (LTE/GSM) or satellite (Iridium-class) communication module Strong flash-memory background: flash filesystems, wear leveling, and bootloader/DFU design I2C/SPI/UART sensor driver development, from datasheet to production Comfortable using JTAG/SWD, logic analyzers, and oscilloscopes to root-cause intermittent field failures Bachelor's degree in Electronics, Electrical Engineering, Computer Engineering, or a related field, or equivalent practical experience Preferred: Experience with marine electronics, industrial IoT, or other harsh-environment or battery-powered products Underwater acoustic communications or DSP experience (FSK/PSK modulation, FFT/Goertzel demodulation, ARQ protocols) Satellite-IoT ingestion experience beyond Iridium Experience mentoring engineers or leading a small firmware team Working knowledge of AES or other embedded cryptography Responsibilities: Design, develop, and maintain firmware for Nordic nRF52/nRF53 BLE SoCs and STM32L4 microcontrollers across the SC2, GIGO, D&T, and Diver Tracking Buoy product lines Build and extend FreeRTOS-based task, queue, and mutex architectures, including safe ISR-to-task handoffs and critical-section design Own BLE stack integration and scan arbitration so multiple concurrent scan modes share a single radio without interfering with each other Integrate and maintain cellular, satellite, and GNSS connectivity, includ