Network: AD, DC, GP, DHCP, DNS, LAN, WLAN, FTP, SFTP, VoIP, PROXY, TCP/IP, VPN, POP3, SMTP, IMAP, Terminal Server, Samba;
Network equipment: Mikrotik, Zyxel,D-Link,TPLink, HP and so on;
IT Security: Proxy, IPSec(and the other VPN’s), IPTables, TrueCrypt, Antivirus software;
OS: Windows: 7, 10, Server 2016, 2019;
Linux: Ubuntu, CentOS, Debian, Mint;
SQL: MS SQL Server 2008/2012, MySQL, PostgeSQL, MySQL, Firebird;
Email: MS Exchange server, Postfix, Sendmail, Exim;
VoIP system: Asterisk;
Monitoring system: Zabbix, Nagios, Prometheus, Grafana, ELK stack;
Virtualization system: KVM, Hyper-V, Proxmox;
Cloud: Google Cloud, AWS, Azure, DigitalOcean, Oracle;
Docker, Kubernetes, Helm;
Remote Control: RDP, SSH, VNC, Radmin, Teamviewer and so on;
Console/Scripting: CMD, Terminal, PowerShell, Bash, AWK, Ruby;
Web/HTTP Server: Apache2, Apache Tomcat;
Proxy Server/Load Balancer: Nginx;
Project management system: Atlassian JIRA, Redmine;
Version control system: Git;
Scripting: bash, Powershell, Ruby, Python;
Programming: Ruby;
IDE: VC;
CI/CD: TeamCity, Jenkins, Puppet, Terraform, Ansible, Hashicorp software;
Atlassian stack.
