Embedded System Engineer

Consulting Engagement: USB & Serial Communications / Windows Platform Stability About the Engagement

We operate a large fleet of automated kiosks running Windows in unattended, high‑uptime environments. Persistent communications failures across USB and serial‑connected subsystems are requiring frequent reboots to restore normal operation. We’re seeking an experienced embedded systems / Windows platform consultant to independently investigate root causes and recommend durable solutions.

• Audit USB and serial (RS‑232/RS‑485) signal integrity on kiosk hardware — voltage margins, cable/connector quality, EMI/noise susceptibility
• Analyze Windows USB host controller behavior, driver stack stability, and COM port enumeration under extended uptime
• Review Windows Event Logs, USBView/USBDeview data, and any existing diagnostic captures
• Identify root causes of device disconnects, enumeration failures, and conditions requiring reboot
• Deliver a written findings report with prioritized recommendations (hardware, driver/firmware, OS configuration)

• 5+ years in embedded systems or hardware engineering with a focus on USB and serial communications
• Hands‑on experience with protocol analyzers (Total Phase Beagle, Ellisys, or equivalent)
• Deep familiarity with Windows driver stack, USB host controllers, and COM port management
• Experience with unattended / kiosk / retail automation hardware a strong plus
• Ability to work on‑site at our facility in San Diego, CA