Hi,
Firstly, I'm glad to meet a countryman in Freelancer. I have just joined in Freelancer about two months and don't see any Vietnamese here.
As described in my profile, I have more than 10 years working in the Embedded Linux, include hardware and software development. For wifi router, I think that you are building on the ARM Linux platform, am I right? With this platform, sometimes, you need add new drivers for new device that has not been supported by Linux kernel. I have experienced working in this field in many years and I believe could complete these jobs perfectly for you.
If I don't have opportunity to give your award, I would like to add you into my friend list for exchanging experience.
Many thanks.