Senior Firmware Engineer

OSI Engineering, Inc.; Palo Alto (CA); On-site; USD 140,000 - 200,000; Full time

Job summary

OSI Engineering, Inc. is seeking a generalist embedded firmware engineer to span the full firmware stack across RTOS, wireless, and sensor drivers for a next‑gen EEG-powered wearable.

You will collaborate with EE leads and silicon vendors, and drive bring-up and validation of subsystems end‑to‑end. The role requires hands-on experience with Zephyr RTOS on Nordic platforms, ESP32 with ESP-IDF, and STM32, plus strong lab skills with JTAG/SWD, logic analyzers, and protocol sniffers.

Qualifications

• 5 years embedded firmware with end-to-end subsystem ownership.
• Hands-on Zephyr RTOS on Nordic silicon—peripheral drivers, deep-sleep, low-power optimization.
• Hands-on ESP-IDF firmware on ESP32-family silicon—Wi‑Fi/BLE, multi-radio coexistence, OTA.

Responsibilities

• Own subsystem-level firmware under the Lead FW's architectural direction.
• Deliver subsystem from spec through driver implementation, bring-up, and validation.
• Rotate across primary domains as roadmap demands.
• Perform hands-on bring-up and debug—power-on, peripheral bring-up, bus validation, timing analysis.

Skills

Embedded firmware

Zephyr RTOS

ESP-IDF

STM32 firmware

Nordic nRF5x/nRF53

Tools

CubeMX

SPI/I2C/I2S/USB

Job description

Company is developing a next-generation AI wearable that combines ultra-high-density neural sensing with a Brain Foundation Model to decode neural signals and convert thought into text without surgery. The company is focused on advancing noninvasive brain-computer interface (BCI) technology, enabling real-time interaction between the human brain and AI. Their goal is to create a direct connection between mind and machine through an EEG-powered wearable platform designed for communication, productivity, and human augmentation.

Position Summary

Generalist with rotating focus across the firmware stack. Moves across subsystems as work demands, picks up a primary domain at a time (RTOS and low-power state machines, wireless connectivity, sensor-acquisition drivers, inter-MCU bridges) and rotates as priorities shift. Works under the Lead FW's architectural direction. Works extensively with external engineering teams at CMs and silicon vendors, the work is outsourced; the accountability is shared with the Lead.

Responsibilities:

• Own subsystem-level firmware under the Lead FW's architectural direction.
• Take an assigned subsystem from spec through driver implementation, integration, bring-up, and validation.
• Rotate across primary domains as the roadmap demands.
• Run hands-on bring-up and debug — first power-on, peripheral bring-up, bus traffic validation, timing analysis, deep-sleep budget verification — with JTAG/SWD, logic analyzers, and protocol sniffers.
• Partner with EE lead and EE ICs on co-debug for new boards — own the firmware side of bring-up checklists.
• Partner with audio, camera, and biosensor leads to integrate their algorithms into the firmware runtime.
• Contribute to the team's firmware engineering practices.

Requirements:

• 5 years embedded firmware — at least one shipped consumer product where you owned a subsystem end-to-end.
• Hands-on Zephyr RTOS experience on Nordic silicon (nRF5x, nRF53, or nRF54L families) — peripheral drivers, deep-sleep state machines, low-power optimization, interrupt-driven design.
• Hands-on ESP-IDF firmware experience on ESP32-family silicon — Wi‑Fi/BLE stack integration, multi-radio coexistence, OTA infrastructure.
• Hands-on STM32 firmware experience — HAL/LL drivers, CubeMX toolchain, timer/DMA/peripheral configuration.
• Hands-on experience writing sensor-acquisition drivers on standard buses (SPI, I²C, I²S, USB) — DMA-driven sampling, ring buffers, hardware-aligned timestamping.
• Comfortable in the lab — JTAG/SWD, logic analyzers, protocol sniffers.
• Direct experience partnering with EE on hardware bring-up and co‑debug.
• Experience with Nordic Semiconductor nRF52 family devices.
• Experience with SoC bring-up.
• Experience with sensor hub development and integration.
• Experience with PPG sensor integration is preferred.
• Ability to work across multiple areas of embedded systems development.
• Generalist mindset with flexibility to support changing project priorities.

Desired Skillsets:

• Raspberry Pi or comparable Linux SBC firmware experience — userspace drivers, bus interaction with attached MCUs, Linux‑side tooling for development‑host bring‑up.
• Adjacent embedded ecosystems — FreeRTOS, ThreadX, NuttX, or bare‑metal Cortex‑M development.
• ARM secure‑partition development (TrustZone or comparable).
• On-device flash file system work — LittleFS, SPIFFS, or equivalent on SPI NAND/NOR.
• Hosting real‑time DSP runtimes alongside wireless connectivity on resource‑constrained MCUs.
• Hardware‑aligned cross‑sensor timestamping for biopotential signal chains.
• Early‑stage or contract experience at a consumer hardware startup.
• Experience with Wi‑Fi and Bluetooth Low Energy (BLE) is preferred.
• Experience with DSP/DSD‑related development is a plus.
• Familiarity with relevant signal chains is a nice‑to‑have.

Duration:

12-month contract with extension/conversion possibilities