Embedded Systems / Firmware Engineer

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. What You’ll Do 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) Required Qualifications 4+ years of experience in embedded systems development Strong experience with nRF (Nordic) and/or STM32 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 Nice to Have 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) What We Offer 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 Salary $110,000 - $170,000 per year