Senior Embedded Systems Engineer

About the job Company Description At Open Ring (www.o-ring.tech), we’re behind the world’s first open-source smart ring platform, built for researchers, startups, and developers. We’re building a community-driven ecosystem for wearable tech innovation. As we scale, we’re eager to welcome exceptional talent ready to contribute to a global movement. Role Overview You’ll be one of the core engineers shaping both firmware and hardware, working across bring-up, validation, and production readiness. Expect to collaborate daily with our full-stack engineer and founders to turn early prototypes into a scalable, reliable product. Key Responsibilities Develop, maintain, and debug low-power firmware for wearable hardware (BLE 5.x, RTOS or bare metal). Lead hardware bring-up on new prototypes validate schematics, review layouts, and help define board revisions. Define, test, and validate existing electrical designs; propose improvements for signal integrity, power, and manufacturability. Own sensor integration and hardware–firmware interface design (I²C, SPI, UART, GPIO). Build and refine factory test firmware and diagnostic tools for CM-level testing and calibration. Collaborate closely with the CM for DFM reviews, EVT/DVT/PVT validation, and yield optimization. Work hand-in-hand with the mobile developer to verify BLE connectivity, data logging, and end-to-end user experience. Contribute to hardware validation test plans, reliability testing, and bring-up documentation. Qualifications 5+ years in embedded firmware and hardware integration (wearables, IoT, or consumer electronics). Proficient in C/C++, RTOS (Zephyr) environments, and common MCU architectures. Solid understanding of schematics, PCB layout constraints, and debugging hardware issues. Experience with BLE 5.x, low-power design, and sensor interfaces. Hands-on experience with prototypes, oscilloscopes, logic analyzers, and hardware validation tools. Comfortable working directly with manufacturers and suppliers on technical issue resolution. Startup-ready mindset, proactive, fast, resourceful, and hands-on. Why Join You’ll work directly with the founding team, no silos, no layers. Own both firmware and hardware outcomes, from prototype to production. Collaborate closely with the mobile and mechanical teams in a fast-moving, experimental environment. Build the core technology for an open, developer-ready wearable platform. Are you ready to contribute to the next generation of smart wearables - apply now! Alternatively, you can also show your dedication to our mission by reaching us directly through email: contact@o-ring.tech. We would love to hear from you! Please note this position is equity based and not suitable in case you're looking for a relocation, position is remote.