Embedded Systems / Firmware Engineer

Nocturnal Inc. is building next-generationsleep technologies which augmentshuman health, performance and well-being.

We’re looking for an engineer who canown 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.

What You’ll Do

• Design and reviewschematics and PCB layouts for wearable electronics
• Select and integrate sensors (IMU, PPG, temperature, etc.)
• Developrobust, 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 ondevice UX, haptics, indicators, and user interaction flows
• Support manufacturing readiness (DFM, testing procedures, revisions)

Required Qualifications

• 4+ years of experience inembedded systems development
• Strong experience withnRF (Nordic) and/orSTM32 platforms
• Proficiency inembedded C/C++
• Solid understanding oflow-power design for battery-powered devices
• Experience withBLE and wireless communication
• Ability to design, test, and debugcustom PCBs
• Comfortable using oscilloscopes, logic analyzers, JTAG/SWD debuggers

Nice to Have

• Experience withwearables, medical, or sleep tech devices
• Knowledge ofZephyr 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)

What We Offer

• Work on acutting-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