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Senior Firmware Engineer

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Helpcare AI

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Location:
United States , Sunnyvale

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

170000.00 - 180000.00 USD / Year
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Job Description:

Cairns Health is building an AI-powered care companion that seniors interact with entirely through voice. We’re looking for a highly skilled engineer to own and evolve the real-time audio and speech processing pipeline that makes these conversations feel natural, reliable, and responsive on embedded hardware. This role is ideal for someone with a strong foundation in C++ on embedded Linux and deep hands-on experience with audio signal processing for speech, whether your background is firmware-heavy with ML exposure or ML-leaning with strong systems skills.

Job Responsibility:

  • Design and implement real-time streaming of speech audio to and from the OpenAI Realtime API
  • Build and tune audio buffering, latency management, and synchronization for conversational speech
  • Implement speech interruption detection (barge-in) to support natural, turn-based dialogue
  • Develop dynamic noise floor detection and related signal conditioning for in-home environments
  • Apply practical audio signal processing and ML techniques to improve speech quality and robustness
  • Evaluate and potentially re-architect our Linux audio stack (e.g., PulseAudio → PipeWire)
  • Optimize performance, memory usage, and reliability on constrained embedded devices
  • Collaborate closely with firmware, ML, and hardware teams to ship production-quality systems

Requirements:

  • Strong proficiency in C++ with experience building production, real-time systems
  • Hands-on experience with audio signal processing for speech, such as: Audio buffering and streaming, Noise estimation / suppression, Voice activity detection or interruption handling
  • Experience developing on embedded Linux (Yocto preferred)
  • Solid understanding of multi-threaded, low-latency systems
  • Comfortable working close to the OS and audio stack

Nice to have:

  • Experience integrating with speech or conversational AI systems
  • Familiarity with ML tools or models used in audio/speech processing
  • Experience with PipeWire, PulseAudio, ALSA, or similar Linux audio frameworks
  • Background in embedded firmware, device bring-up, or kernel-adjacent development
  • Experience with NXP i.MX8 or similar SoCs

Additional Information:

Job Posted:
February 13, 2026

Employment Type:
Fulltime
Work Type:
On-site work
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