Senior Firmware Engineer

About the RoleThis 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 DoArchitect 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 For6+ 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.LocationThis role is on-site in New York, NY. Visa sponsorship is not available.