Oleksandr Meleshchuk

- Development, design, maintenance of the computer networks, computer equipment, network services, improvement and analysis of existing network, server, and service infrastructure; 

- Users’ technical and software support; 

- Setting up and maintaining Microsoft based operation systems WinXX, Windows Server 20XX; 

- Setting up and maintaining Linux based operation systems Debian, Ubuntu, CentOS, and Unix-like FreeBSD; 

- Administration of the: MTA(Dovecot, Postfix, Exim4, MS Exchange Server), FTP, SQL(MS SQL, MySQL, PostgreSQL, MongoDB), LAMP(Apache, Nginx, PHP), HAProxy, DNS, DHCP, NPS, DFS, NAS, VPN; 

- VoIP servers; 

- AD, LDAP, AAD; 

- Extensive experience with DigitalOcean, Amazon AWS, GCP, Vultr, Azure, and other cloud service providers; 

- Ubiquity, Mikrotik, Cisco, Dell, HP, Fortigate, SonicWall network equipment; 

- Intrusion detection/prevention services (IPS, IDS, SNORT, Suricata) firewall (routing, VLAN, ACL, Proxy, NAT, DMZ), CARP, HA; 

- HP, Supermicro, DELL, Fujitsu Siemens, IBM, Lenovo, EMC, NetApp equipment;

- Website administration (WordPress, Joomla, PHP, HTML, css etc.); 

- Virtualization (Proxmox, Virtualbox, VMware, HyperV);

- etc