Configuring operating systems (Linux, Windows, FreeBSD) for maximum performance, optimizing the services;
Web-server support (Nginx, Apache, IIS), application servers;
Backup configuration (Bacula, Amanda, mysqldump, Microsoft DPM etc.)
Server monitoring (Zabbix, Cacti, Pandora, Munin, Grafana, Loki etc.)
Amazon Web Services , Microsoft Azure and other public clouds;
Version control and automatic configuration management system support (svn, git, puppet, ansible, chef, GitLab CI/CD);
Mail server support (Exchange, Exim, Postfix, CommuniGate, etc.);
Configuring and optimizing database servers (MySQL, Postgres, MSSQL, Redis, Oracle);
Software upgrade, reconfiguration;
Installing specific software for specific tasks;
VPS/VDS setup and support;
Curing of sites from viruses, support for all popular engines (Joomla, WordPress, Bitrix, etc.);
Configuration and support for VPN;
Writing or editing of system scripts, automation of tasks;
Configuring and supporting virtualization systems (Xen, Hypev-V, KVM, Docker, VMware);
Configuring system security;
Active Directory setup and support;
Treatment of infected websites, updating, protection from reinfection;
Configuring and maintaining various application servers;
Assistance in defending against DDoS attacks.