Hardware: error troubleshooting and repair
Software: Windows desktop and server, Linux ( Debian, Ubuntu, Centos, etc. ) administration and implementation, error troubleshooting and repair
Networking: Implementation and administration complex enviroment, vlan, VPN, multiple subnet and gateways, wireless implementation, kiosk, hotspot, firewall troubleshooting, pfSense administration, Unifi Administration, Ubiquiti devices administration, Mikrotik, Raspberry pi, IoT ( Shelly, Sonoff )
Firewall: Pfsense, IPcop, USG Ubiquiti
Mail server: Zimbra, Postfix
Web Hosting CP: Plesk, Cpanel, Virtualmin
Virtualization: Vmware ESXi, Proxmox, KVM, XenServer, Qnap, Synology NAS
Languages: Python, Go, HTML5, Php
Google G Suite and Office 365 implementation