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. About Nocturnal Inc. Nocturnal Inc. is dedicated to developing innovative wearable devices that improve human health and well-being. Description 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 #J-18808-Ljbffr