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Firmware Engineer

Firmware Engineer

SonicuIndianapolis, IN, US
1 day ago
Job type
  • Full-time
Job description

Job Description

About Sonicu

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.

What you’ll do

  • 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 : I² C / 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 / diagnostics and 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

What you’ll bring (required)

  • 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

    • Nice to have

  • 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)
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