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Stealth Mode Startup · 3 days ago

Founding Engineer - Senior Hardware Engineer

Champaign, IL

Full-time

Onsite

Senior Level

$50K/yr - $65K/yr

Stealth Mode Startup is a seed stage healthcare startup founded by Ex-Google & Apple employees. They are seeking a full-stack hardware engineer to manage the entire hardware lifecycle, from concept through PCB design and low-level firmware development.

Computer Software

Responsibilities

Design and implement robust firmware using Zephyr RTOS on Nordic nRF5340 dual-core architectures

Write and optimize peripheral drivers (SPI, I2C, UART) for PMICs, PPG heart-rate sensors, and 6-axis accelerometers

Own the full PCB process using KiCad (or similar), focusing on 4-layer (or higher) flex-rigid designs that fit within ultra-compact enclosures (e.g., smart rings)

Develop and fine-tune custom BLE (Bluetooth Low Energy) services and profiles to ensure low-latency (<40ms), high-reliability data streaming to mobile clients

Conduct system-wide power profiling to maximize battery life, implementing sleep modes and efficient sensor sampling strategies

Collaborate on the initial system-level planning, defining hardware requirements, and selecting low-power components to build platforms from the ground up

Solid software development skills in C and C++

Qualification

Firmware developmentPCB designCC++ programmingZephyr RTOSKiCadBluetooth Low EnergyPower profilingComponent selectionMechanical designSelf-starter

Required