Hello,
I've been a system administrator (professionally) for 11 years. I also worked for a web hosting company. I did this stuff many times. I even did couple of security related jobs via freelancer.com.
I'm a programmer and sysops with emphasis on security and performance, and I'm confident I can do this job.
I can speak, read and write English like a native, so we would not have any communication problems either.
Let me know if you want to chat some more.
- Alek