Senior Firmware Engineer

Arqaios is building ALLIE, an intelligent sensing platform embedded directly in everyday building fixtures such as light switches, power outlets, and air vents. Using mmWave radar and edge AI, ALLIE delivers real-time fall detection, occupancy awareness, gait monitoring, and energy optimization, all without cameras or wearables. It’s privacy by design, built into the walls.

We’re hiring a
Senior
Firmware Engineer to own the embedded systems that power ALLIE. You’ll develop the firmware that drives our sensing pipeline, integrate hardware and software at the lowest levels, and ensure our devices perform reliably in production environments. You’ll work shoulder-to-shoulder with our AI/ML team and product leadership to ship a product that people trust with their safety.

This is a foundational engineering role at a startup with real traction, patented technology, and a clear path to market. If you want to build something that matters, from the silicon up, this is it.

• Design, develop, and optimize embedded firmware in C/C++ for ALLIE’s sensing fixtures, including radar initialization, ADC acquisition, FFT processing, and ML inference at the edge
• Implement and maintain the full signal processing pipeline
• Develop OTA firmware update mechanisms that allow remote deployment without physical fixture access

• Lead sensor bring-up and configuration for mmWave radar chipsets and environmental sensors
• Own hardware–firmware integration across UART, SPI, I2C, and powerline communication interfaces
• Configure and debug microcontrollers and SoCs (ESP
  32, ARM-based MCUs), including peripherals, memory, and timing behavior
• Read and interpret hardware schematics, datasheets, and reference designs to drive integration decisions
• Collaborate with PCB design partners on Gen2 fixture design and implementation

• Design and implement secure wireless communication stacks using Wi‑Fi 6 (802.11ax) on ESP
  32-C6 and similar platforms, ensuring reliable, low‑latency data transport between fixtures, hubs, and cloud services
• Lead the integration of Matter and Thread protocols to position ALLIE fixtures as interoperable nodes within the broader smart home ecosystem (Apple Home, Google Home, Amazon Alexa)
• Implement and validate Thread mesh networking for low‑power, reliable fixture‑to‑fixture and fixture‑to‑hub communication in dense building environments
• Evaluate, prototype, and integrate additional wireless protocols (BLE 5.x, Zigbee, Z‑Wave) as needed for third‑party device interoperability and ecosystem expansion
• Architect hybrid connectivity strategies combining wireless protocols with powerline communication for maximum reliability in steel‑framed commercial buildings and multi‑unit residential facilities
• Work with the product team to ensure wireless implementations meet Connectivity Standards Alliance (CSA) certification requirements for Matter and Thread compliance
• Optimize wireless stack performance for power consumption, range, throughput, and coexistence
• Develop and maintain embedded Linux software for ALLIE’s facility hub/gateway running on NVIDIA Jetson Orin Nano, Raspberry Pi, or similar SBC platforms
• Implement event ingestion and multi‑fixture data fusion logic, aggregating alerts from up to 50 fixtures per facility, consolidating overlapping detections into single actionable events
• Build and optimize local ML inference pipelines on the hub using GPU‑accelerated frameworks (NVIDIA Tensor
  
  RT, CUDA) for advanced analytics that exceed fixture‑level edge processing capabilities
• Design and implement a resilient local event queue with 24‑hour offline buffering to ensure no data loss during cloud connectivity interruptions

• Design and execute comprehensive testing and validation strategies for firmware and hardware integration
• Diagnose and resolve system‑level issues related to timing, throughput, stability, and false alarm rates
• Develop Python‑based tools for automated testing, data inspection, and integration workflows
• Support regulatory certification efforts (FCC Part 15.255, UL/ETL) by…