Firmware Engineer

Sonicu builds wireless monitoring solutions that protect vaccines, labs, and other critical environments. Our cloud platform, SoniCloud, aggregates real-time sensor data and automates alarms and compliance reporting across healthcare and life sciences. We support multiple connectivity paths (Wi-Fi, cellular, Ethernet) with built-in data redundancy, and operate an in-house calibration lab for NIST-traceable sensors.

• Design, implement, and maintain embedded firmware for low-power wireless devices using C/C++ and FreeRTOS

• Develop and optimize drivers and board-support code for peripherals: I²C/SPI/UART/ADC/DAC, sensors, displays, external radios (LoRa, cellular, NFC) and various forms of external memory

• Build reliable wireless features: LoRaWAN class A/C, BLE (GATT), Wi-Fi station/AP, provisioning, roaming, and power-aware duty cycling

• Implement secure bootloaders and OTA update flows;
  add logging/diagnosticsand fail-safe rollback

• Collaborate with hardware, cloud, and mobile teams to ship features end-to-end;
  participate in code reviews and CI

• Support bring-up, DVT, and manufacturing test scripts;
  partner with our ISO 17025 lab on calibration/workflows and field reliability

• Profile performance, battery life, and RF behavior;
  instrument telemetry for real-world observability

• 4+ years professional embedded firmware experience

• Strong C/C++;
  solid Git workflow

• Hands-on experience with: HAL/LL, toolchains, debuggers like J-Link/OpenOCD, SWD/GDB

• Experience with at least two networking stacks/ communication protocols - from:

  LoRaWAN, Wi-Fi, BLE, NFC, Cellular

• Comfort with oscilloscopes/logic analyzers, schematics, and reading datasheets

• Clear communication, pragmatic problem-solving, and product instincts

• Experience with ESP32 or STM32 microcontrollers

• FreeRTOS (tasks/queues/timers), lwIP, mbedTLS;
  secure boot/flash encryption

• LoRaWAN MAC/regions, BLE pairing/bonding, Wi-Fi provisioning/captive portal

• Factory test automation;
  Python for tools/fixtures

• Power modeling for battery-operated designs

• UX design for e-paper/LCD displays on constrained MCUs (e.G LVGL)

• OTA services, fleet management, and device telemetry design

• Familiarity with quality/compliance contexts common to healthcare & life sciences (e.G., audit-friendly logging/reporting)