Worked on USB device communication and driver reliability in the espressif/esptool and espressif/esp-usb repositories, focusing on embedded systems. Delivered a feature for esptool that replaced UARTDEV_BUF_NO-based detection with a VID/PID-based approach, improving the accuracy and reliability of USB-OTG and USB-JTAG device identification using Python. In the esp-usb repository, addressed a hardware compatibility issue by implementing a C-based fix for CH34x USB converter DTR/RTS polarity, restoring reliable serial communication and reducing user-reported issues. The work demonstrated depth in device communication, driver development, and embedded systems, with clear commit messaging and traceability throughout the engineering process.