Senior Firmware Engineer

About the Role This is a senior embedded firmware role on the core hardware team of an early-stage wearable AI startup, where you'll architect and ship the firmware powering a next-generation biometric wearable device. You'll work hands-on from prototype through mass production, playing a foundational role in defining how the platform is built and how it performs in the real world. The work sits at the intersection of low-power embedded design, sensor integration, and production engineering — shipping a category-defining consumer product that matters to users. What You'll Do Architect and develop embedded firmware for battery-powered wearable devices. Own core systems for low-power wireless connectivity, sensor processing, and real-time data pipelines. Design and optimize Bluetooth Low Energy (BLE) connectivity for ultra-low-power operation. Build robust power management systems to maximize battery life. Develop multi-core embedded data pipelines for real-time sensor acquisition and processing. Integrate biometric and environmental sensors via SPI, I2C, UART, GPIO, DMA, and interrupts. Optimize firmware performance, memory usage, latency, and reliability. Lead board bring-up, debugging, validation, and manufacturing support. Collaborate with hardware, algorithms, product, and industrial design teams across the full product lifecycle. Establish firmware best practices, testing, and CI workflows for the team. What We're Looking For 6+ years of embedded firmware engineering experience, with a track record of shipping battery-powered wearable or consumer electronics devices to production. Deep expertise in Bluetooth Low Energy (BLE) systems and low-power embedded architectures. Strong proficiency in Embedded C/C++ and RTOS-based systems (e.g., FreeRTOS, Zephyr). Hands-on experience with ARM Cortex-M microcontrollers and modern debugging tools. Experience with multi-core embedded data pipelines and always-on power optimization. Sensor integration experience using SPI, I2C, UART, GPIO, DMA, and interrupt-driven designs. Familiarity with secure bootloaders, OTA firmware updates, wireless certification, and production firmware. Background in sensor fusion, signal processing, or biometric sensing is a strong plus. Experience with platforms such as Nordic, Qualcomm, Ambiq, or STMicroelectronics is a plus. Comfortable working in person with a small, fast-moving engineering team. Location This role is on-site in New York, NY . Visa sponsorship is not available.