Embedded Systems​/Firmware Engineer

Nocturnal Inc. Embedded Systems / Firmware Engineer Cambridge, MA
· Full time

We're looking for a Embedded Systems / Firmware Engineer own the hardware–firmware stack end-to-end. The ideal candidate will bring strong embedded systems experience and a passion for creating innovative consumer electronics.

Nocturnal Inc. is dedicated to developing innovative wearable devices that improve human health and well-being.

Nocturnal Inc. is building next-generation sleep technologies which augments human health, performance and well-being.

We’re looking for an engineer who can own the hardware–firmware stack end-to-end
: from circuit design and sensor integration to low-power firmware, testing, and UX-aware embedded behavior. This is an in person position in Cambridge MA. The ideal candidate has experience taking hardware from prototype through production.

This is a hands‑on role with real ownership and impact.

• Design and review schematics and PCB layouts for wearable electronics
• Select and integrate sensors (IMU, PPG, temperature, etc.)
• Develop robust, low‑power firmware for nRF and/or STM MCUs
• Implement power management strategies (sleep states, battery optimization, energy profiling)
• Write clean, maintainable, well‑documented embedded C/C++ code
• Bring up boards, debug hardware/firmware issues, and run validation tests
• Optimize BLE communication for performance and power
• Collaborate on device UX
  , haptics, indicators, and user interaction flows
• Support manufacturing readiness (DFM, testing procedures, revisions)

• 4+ years of experience in embedded systems development
• Strong experience with nRF (Nordic) and/or STM
  32 platforms
• Proficiency in embedded C/C++
• Solid understanding of low‑power design for battery‑powered devices
• Experience with BLE and wireless communication
• Ability to design, test, and debug custom PCBs
• Comfortable using oscilloscopes, logic analyzers, JTAG/SWD debuggers

• Experience with wearables, medical, or sleep tech devices
• Knowledge of Zephyr RTOS, FreeRTOS
  , or similar
• Sensor fusion or signal processing experience
• Familiarity with power profiling tools (Nordic Power Profiler, etc.)
• UX‑driven embedded behavior (state machines, haptics, LEDs)
• Manufacturing, certification, or regulatory exposure (FCC, CE)

• Work on a cutting‑edge sleep wearable with real user impact
• High ownership and technical autonomy
• Competitive salary / contract rate + equity (for full‑time)
• Opportunity to shape both the product and engineering culture