Senior Firmware Engineer; Bluetooth

Requirements

• 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, L2
  
  CAP, 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 Soft Device / 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) Track record shipping secure OTA DFU (signed images, dual-bank update, rollback) on a constrained device
• (Desirable) Experience with multi-link / multi-role BLE topologies
• (Desirable) Bluetooth SIG qualification and regulatory certification experience (FCC/IC/CE/MIC)
• (Desirable) Bare-metal and cooperative-scheduler design in environments without a traditional RTOS
• (Desirable) Expertise in automated BLE testing, RF chamber test setup, and connectivity observability/telemetry
• (Desirable) Deep understanding of embedded security practices: secure boot, key provisioning, encrypted firmware, and threat modeling for wireless attack surfaces

• 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