Firmware Engineer
sonicuIndianapolis (IN)
About the role
About Sonicu Sonicu builds wireless monitoring solutions that protect vaccines, labs, and other critical environments. Our cloud platform, Soni Cloud, 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 FreeRTOSDevelop 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/diagnostics and fail-safe rollback Collaborate with hardware, cloud, and mobile teams to ship features end-to-end; participate in code reviews and CISupport 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/GDBExperience 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 designsUX 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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