Remote Linux Embedded / Systems Software Engineer - Audio & USB HID

• Set up the Debian build/test environment and create a production-ready systemd service that starts at boot and recovers from failures.
• Analyse the existing Windows listener, extract portable C/C++ logic, and replace Windows-specific APIs with Linux equivalents.
• Capture system audio from the default output using PipeWire or PulseAudio (WASAPI loopback equivalent), handle device hot-swap and idle/silent states with low CPU usage.
• Encode audio (Opus), chunk into 64-byte HID packets, and implement the required notification/header protocol.
• Enumerate the composite USB device, locate the correct HID interface, and communicate via hidraw or libusb.
• Handle USB attach/detach, reconnect, write failures and buffer overruns robustly.
• Implement the shared command protocol (no API changes) and provide matching stub handlers.
• Deliver diagnostic logging with parity to the Windows tool (audio level, VID/PID, connection status, errors, etc.).
• Perform side-by-side validation against the Windows version and Android reference app for audio quality, latency, framing and stability.

• Strong C/C++ systems programming
• Proven Linux/Debian daemon or service development
• Practical experience with systemd
• Linux audio (PipeWire, PulseAudio or ALSA)
• USB device communication (USB HID, hidraw, libusb, composite devices, hot-plug handling)
• Real-time or near-real-time audio/data streaming
• Familiarity with Opus or similar low-latency codecs
• Ability to debug across application, OS, audio and USB boundaries
• Experience analysing and porting Windows code to Linux

Desirable

• Embedded Linux
• BLE / DA14531 or similar
• Custom USB HID protocols
• Kiosk / unattended system experience
• Windows-to-Linux ports
• Audio latency and codec pipeline debugging