Linux Expert/Guru

At least 5 years of experience of Linux developer or DevOps (with proven record of writing a lot of production code)
Skilled at multiple programming languages, as minimum: C, C++ and Python
Strong scripting expertise
A major experience with different kinds of Linux kernels, including code-level customization
Strong background in different types of storages and file systems
Strong background in virtualization solutions, as minimum: KVM, Xen and VMware
Linux performance metrics and performance tuning of all services offered by a Linux server