Hello,
I have experience with C/C++, embedded systems, Linux etc. I have developed WEB UIs on resource restricted embedded Linux systems by using C CGI, HTML, CSS, Javascript, AJAX.
As far as I understand from your job description you have a Linux box as router (I guess this because Linux has great resources for network equipments) and need a web page in order to control this routers. You need to select a WEB server. You need to decide event-driven lighttpd or connection driven like apache). I can help to you with C CGI instead of PHP and FCGI. I haven't got so much experience with SQL but I think I can handle for your needs and this is the smallest part of your problems.
I am looking forward to a reply from you.
Best regards,
Cumali Ceylan