Requirements
Strong background In voice and voip application such as freeswitch , asterisk ,kamailio
Experience with Linux for at least 2 years
Familiarity with the fundamentals of Linux scripting languages(Such as bash)
Experience installing, configuring, and maintaining services such as Bind, Apache, MySQL, nginx, etc.
Familiarity with load balancing, firewalls, etc.
Experience with virtualization technologies, such as Xen ,KVM ,ESX .