Dear Sir (ich kann auch ein bisschen deutsch sprechen),
I am Thomas, a 23 years old french that graduated from university back in 2012.
Back when I was a kid, I only had a computer to play with, so I spent all my time on it.
That's why I now have more than 7 years of experience in Linux systems administration, and I have knowledge with the most popular Linux distributions.
I worked as a network/system administrator at various companies where I set up WebServer, DNS servers, Databases, Monitoring, Backups, Scripting jobs, Virtualisation and so on.
That's whhy I will have no problem configuring your server with ISPConfig and protecting it against all kind of attacks.
I've had projects which required those skills (either high-traffic websites or website DDOSed by their rivals in their market).
I think you should use nginx as a frontend (forward) proxy to apache in order to get best performance, well that's what I always did. I am also able to fine-tube the setting of apache, mysql, php-fpm and nginx in order to use caching to reduce server load, increase availability and decrease the risks of getting DDOSed.
You can checkout my profile and see how much Linux-related project I successfuly completed.
Please come and have a chat with me, I am kind and helpful.
Regards,