Senior Firmware Engineer, Eight Sleep

• Proven BLE Expertise: 5+ years of embedded software engineering, with at least 3 years shipping production BLE firmware
• Deep Protocol Knowledge: Strong working knowledge of the Bluetooth stack end-to-end — GAP, GATT, SMP, L2CAP, link layer behavior, advertising and scanning, connection events, pairing/bonding, and BLE security (LE Secure Connections, key management)
• Silicon Vendor Stacks: Hands-on experience with at least one vendor BLE stack and SDK (Nordic SoftDevice / nRF Connect SDK / Zephyr, Apple/Broadcom, TI, or similar). Comfortable reading and debugging vendor stack source
• Embedded Fundamentals: Fluency in C/C++ on resource-constrained microcontrollers; proficiency with Python or NodeJS for host-side tooling. Skilled at peripheral drivers and bus protocols (UART, I2C, SPI), DMA, and low-power design
• Power Discipline: Demonstrated ability to hit ultra-low-power targets: measuring and optimizing radio duty cycle, sleep current, and connection parameters against real battery-life budgets
• Shipping at Scale: Have launched and maintained large fleets of wireless devices, including monitoring connectivity telemetry, sync reliability, and OTA firmware updates in the field
• Hardware Acumen: Ability to read data sheets, schematics, and antenna matching networks for hardware bring-up and RF debugging. Fluent with logic analyzers, oscilloscopes, and BLE protocol sniffers (Ellisys, Frontline, nRF Sniffer, or equivalent)
• Adaptive Problem Solver: A fast-paced, iterative approach to debugging issues that span firmware, RF, mobile OS, and physics
• Travel Readiness: Willingness and ability to travel regularly to China for supplier and CM support

Desirable

• Join our team as a Sr. Firmware Engineer, Bluetooth Low Energy, to own the wireless connectivity stack that brings a new generation of hardware to life
• You'll be part of a small team designing and implementing the BLE layer that connects our members' devices to the Eight Sleep ecosystem with high autonomy and direct, measurable impact on the member experience
• We are a fast-moving, fast-growing company, and we embrace individuals with a growth mindset and a strong desire to help us achieve our mission: improving people's lives through optimal sleep
• Own the BLE Stack: Architect, implement, and maintain the Bluetooth connectivity layer across our Pod ecosystem. Define GATT services, characteristics, and connection strategies that deliver reliable, secure, and power-efficient communication
• Optimize for Always-On Devices: Drive radio-on time, advertising intervals, connection parameters, and PHY selection while maintaining low-latency sync of biometric data
• Ensure Bulletproof Interoperability: Deliver a connectivity experience that "just works" across the long tail of iOS and Android devices, OS versions, and real-world RF environments. Use sniffers, protocol analyzers, and on-device telemetry to root-cause cross-stack issues with mobile and Pod gateway teams
• Ship and Sustain OTA at Scale: Design and harden the secure OTA DFU pipeline so we can confidently push firmware to a global fleet of devices with low friction and zero bricks
• Bring Up New Silicon: Partner with hardware teams on board bring-up, antenna tuning, regulatory certification (FCC/CE/Bluetooth SIG qualification), and silicon-vendor stack integration for our Nordic-based platform
• Global Collaboration: Work closely with our manufacturing partners in China to develop RF and BLE production tests, ensuring we ship high-quality, fully-validated devices on time
• Effective Remote Communication: Thrive in a hybrid in-person and remote work environment, ensuring clear and impactful communication across firmware, mobile, hardware, and ML teams