Oleksandr Derevianko

• Personally implemented Zabbix to monitor the entire fleet • Automation of processes related to server deployment and Linux machine configuration, “Ansible” • Creation VPN tunnels (IpSec, GRE, Wireguard, Site-to-Site) • Implemented a deep packet inspection system “ntopng, nprobe” • Creation of local area networks, Wi-Fi on ships, IP-phones, Satelite-phones, Setting up hotspot authentication, installation of satellite dishes, Star-link, VSAT, and other. Installation of GMDSS navigation equipment and other. • Assembly of network racks, configuration of server architecture “VMware”, backup (Veeam Backup & Replication) • Setting tasks for the crew to install PC equipment, printers, camera installation, and cable laying • Configuring file sharing and email

Configured and optimized network infrastructure: Cisco, Juniper, Arista, D-Link, Huawei, Mikrotik • Managed ACLs, VLAN provisioning, IP addressing, traffic balancing (BGP) • Supported DWDM transport system (Ciena 6500) • Performed real-time monitoring via Zabbix and packet analysis via Wireshark • Used TCPdump, nslookup, netstat, whois, ping, fping, traceroute, iperf for diagnostics Investigated and resolved network incidents, ensuring minimal downtime • Coordinated cross-department engineering teams to execute maintenance tasks

Led the design, deployment, and ongoing support of the complete IT infrastructure for a growing pharmacy chain Built and maintained enterprise-grade LAN/WAN networks for pharmacies, offices, and warehouses from the ground up Designed network architecture including IP addressing, VLANs, routing, DHCP, and DNS Administered server infrastructure: Windows Server (Active Directory, Group Policy, File & Print Services) User, group, and access rights management Centralized authentication and policy enforcement Implemented backup and disaster recovery solutions, ensuring business continuity and data protection Deployed and managed network hardware (routers, switches, firewalls, Wi-Fi access points) Ensured IT security and compliance: Network segmentation Access control policies Endpoint protection and data security Planned and executed IT setup for new offices and pharmacy locations, including: Server rooms and network racks Workstations, POS systems, printers, and scanners Secure connectivity between locations Installed and configured CCTV and video surveillance systems, integrated with the local network Provided Level 2–3 technical support, troubleshooting complex hardware, software, and network issues Acted as the single point of responsibility for IT operations, aligning infrastructure with business needs