Hello! I'm Noah. I am very familiar with Raspberry Pi (I own a half dozen or so, various models) as well as embedded interfaces, including UART. I have developed solutions for PIC controllers using GPS/NMEA chips as well, though not directly from the Pi. I am confidant I would be able to make the switch, though. I am also familiar with sockets and UDP connections in Python.
I have estimated 5 days as a conservative guess, the process of software engineering (as you probably know) is never easy to estimate. It is very possible it could take much less time.
Please also consider the fact that I am fluent in English and from and English-speaking country when comparing my bid to others--I've been bitten by that problem before.
I look forward to working with you. Don't hesitate to contact me with questions.
Thank you.