Senior Embedded Firmware Engineer (Wireless Sensing & Edge Systems)

ob Type: Full-Time

Location: On-Site

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Job Description

We are building a next-generation embedded sensing platform that integrates wireless signal analysis, radar data fusion, real-time edge processing, and secure cloud connectivity.

We are seeking a highly skilled Embedded Firmware Engineer to lead development of the core sensing and communications firmware stack. This is a hands-on role requiring deep expertise in embedded systems, signal processing, and low-level hardware integration.

The ideal candidate has experience working with wireless PHY-layer data, radar interfaces, and secure IoT connectivity.

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Key Responsibilities

Wireless Sensing Pipeline (ESP32-S3)

• Configure ESP32-S3 to extract and process Channel State Information (CSI)
• Capture and analyze subcarrier amplitude and phase data at 100 packets per second
• Implement digital signal filtering (bandpass 0.3Hz–3Hz range)
• Develop Short-Time Fourier Transform (STFT)-based event detection algorithms
• Optimize signal quality and reduce environmental noise artifacts
• Minimize false positive event classification

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Radar Integration & Sensor Fusion

• Integrate mmWave radar module via UART interface
• Process raw serial radar data streams
• Implement presence detection logic during low-motion conditions
• Develop classification states based on radar output data
• Extract low-frequency physiological or motion-based signals
• Fuse radar and wireless sensing inputs for high-confidence event detection

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Connectivity & Embedded Security

• Implement TLS-encrypted MQTT client on embedded device
• Design robust WiFi connection and reconnection logic
• Implement local hardware-based fail-safe triggers
• Develop secure Over-the-Air (OTA) firmware update system
• Validate signed firmware images before deployment
• Support secure boot and firmware integrity verification

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Mechanical & Deployment Awareness

• Support firmware integration with IP65-rated enclosure systems
• Ensure RF and radar transparency compliance (non-metallic housing constraints)
• Support ceiling-mounted or elevated deployment configurations
• Account for sensor angle optimization in firmware calibration

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Required Qualifications

• Strong experience with ESP-IDF
• Experience extracting and processing WiFi CSI data
• Experience handling raw serial data from mmWave radar modules
• Embedded C/C++ development
• Strong signal processing background (STFT, filtering, FFT, frequency-domain analysis)
• MQTT over TLS implementation on microcontrollers
• OTA firmware update implementation
• Experience working with hardware-level debugging tools

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Preferred Qualifications

• FreeRTOS task architecture design
• Secure boot implementation
• RF systems integration experience
• Experience with sensor fusion algorithms
• Edge AI / TinyML deployment experience
• Experience in safety-critical or reliability-focused systems

Job Type: Full-time

Work Location: In person