Hello, My experience is mainly with web servers, mail, application, databases, directories, firewalls, proxy, cache ... I mainly master open source technologies such as Apache2, Nginx, Varnish, HAProxy, Keepalived, Mysql, MariaDB, Percona XtraDB Cluster, OpenLDAP, pfSense, ModSecurity, Rsync, Rsnapshot, FreeNAS, Proxmox I also master other paid solution such as VMware ESXI and vSphere and WHM/cPanel. I worked with large companies as a system administrator such as WHC.ca