Architect systems : Systems : Windows Server , Linux, Active Directory, DHCP , DNS, OpenLDAP, Nginx - Reverse Proxy, Apache2, FTP, SFTP, TFTP, NFS, SAMBA, SAMBA 4, CIFS , NTP, SSH, Telnet, OwnCloud, Grafana, Kibana , Rasberry PI DataBase : SQL Express, PostgreSQL, MySQL, MariaDB, SQLite, ElasticSearch, MongoDB. Type Time Series : InfluxDB, ElasticSearch, Prometheus Virtualization : VMWare ESXI 5.5 & 6, Microsoft Hyper-V, Docker, Docker-Compose Dev. : JavaScript, TypeScript, NodeJS, LoopBack, Angular 2+ & Material ,Python, Bash , PowerShell, Android, Java, C#, PHP, Arduino. Network : OSPF, EIGRP, RIPv1, RIPv2, IGRP. VLAN , STP, VTP, WatchGuard, OpenVPN