Firmware Engineer
Sonicu · Indianapolis, Marion County ·
- Category
- Embedded
Job DescriptionAbout 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.
- 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/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
- 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)