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VLADYSLAV LAVRYNENKO
Senior System Administrator | Infrastructure Operations Engineer | DevOps-oriented
Limassol, Cyprus | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)
PROFESSIONAL SUMMARY
Senior System Administrator and infrastructure operations specialist with 15+ years of hands-on experience supporting business-critical IT environments, enterprise networking, virtualization and server services. Practical expertise includes Hyper-V, Proxmox, VMware, Windows Server, Ubuntu Server, MikroTik/Fortinet networks, VPN, backup operations and technical incident response.
Recently deployed Zabbix 7 on Ubuntu Server with PostgreSQL and Nginx and supported monitoring, service troubleshooting and access hardening. Delivered multi-site VPN connectivity and hospitality network projects, alongside IT leadership and vendor coordination. Currently strengthening Linux administration and automation skills. Based in Limassol and available for full-time onsite work.
TARGET ROLE AND WORK FORMAT
Target positions
Senior System Administrator, Infrastructure Operations Engineer, Systems / DevOps Engineer, Technical Lead
Preferred format
Full-time onsite in Limassol, Cyprus. Existing IT-Avia projects are handled outside working hours or on weekends.
Work focus
Linux and Windows server operations, virtualization, infrastructure monitoring, network security, backup and recovery, incident troubleshooting, technical automation.
Management scope
Hands-on infrastructure engineering with experience coordinating IT operations, vendors and small technical teams.
TECHNICAL SKILLS

Area
Technologies / Scope
Level
Linux / Services
Ubuntu Server 24.04 LTS, SSH, packages, systemd/services, logs and troubleshooting
Working
Virtualization
Hyper-V, Proxmox, VMware/vCloud; VM deployment, virtual networking, storage, snapshots
Strong
Monitoring
Zabbix 7 deployment; SNMP/ICMP monitoring design, critical alerting requirements
Hands-on
Web / Databases
Nginx web frontend, PostgreSQL for Zabbix; Microsoft SQL Server / BAS support
Hands-on
Networking
TCP/IP, DNS, DHCP, VLANs, routing, switching, VPN, firewall/NAT, IP allowlists
Advanced
MikroTik
RouterOS, CHR hub, WireGuard / OpenVPN, branch VPN, firewall policies, dual WAN
Advanced
Fortinet
FortiGate policies, remote-access VPN, NAT and basic segmentation
Working
Enterprise LAN/Wi-Fi
Cisco, Aruba CX, Grandstream; high-density hotel Wi-Fi and Ekahau surveys
Strong
Security / Access
SSH allowlisting, firewall restrictions, BitLocker, server hardening, incident triage
Hands-on
Backup / DR
Windows / VM backup operations, MS SQL/BAS backups, recovery planning and checks
Strong
Windows / AD
Windows Server, Active Directory, DNS, DHCP, GPO, RDP and file services
Advanced
Cloud VM Operations
Hosted Hyper-V infrastructure; Ubuntu VM provisioning and network/service setup
Hands-on
Scripting
Windows batch scripts and administration scripts; basic Linux shell commands
Basic
Microsoft 365
Exchange Online, Teams, SharePoint, OneDrive, user administration and migration
Strong
Endpoint Mgmt
Microsoft Intune rollout, Entra ID, Windows Autopilot, application deployment, BitLocker
Hands-on
Google Workspace
Users, groups, mail and collaboration administration
Working
Server Workloads
RDP terminal services, business apps (BAS/1C), SQL workloads, service troubleshooting
Strong
Documentation
Infrastructure diagrams, configurations, inventories, runbooks, incident records
Advanced
PROFESSIONAL EXPERIENCE
Experience includes concurrent roles and outsourced projects. Current IT-Avia work is project-based and carried out on weekends or outside normal working hours.
Network Engineer | July 2025 - May 2026
LLC “TvLux” | Kyiv, Ukraine
Scope: Design, deployment, optimization, and technical support of wired and wireless network infrastructure for large hotel properties.
• Supported enterprise Wi-Fi and network infrastructure projects for Radisson, Hilton, Hyatt, and Novotel hotel properties.
• Worked with high-density wireless deployments containing up to 300 access points at a single hotel site.
• Conducted Ekahau-based wireless surveys and analysis to identify coverage gaps, interference, capacity limitations, and potential access-point placement issues.
• Contributed to improving Wi-Fi stability, coverage, roaming, and overall guest network performance.
Head of IT Department | March 2024 - September 2026
(Defense Technology / Miltech) | Ukraine
Scope: Business-critical infrastructure operations, endpoint management, security controls and IT leadership in a defense technology environment.
• Maintained reliable infrastructure services and coordinated technical incident handling in a security-sensitive environment.
• Coordinated technical activities, infrastructure support, documentation, access management, and operational stability tasks.
• Supported Windows/server infrastructure, network services, endpoint configuration and security-related operations.
Project highlights:
• Implemented Microsoft Intune from scratch: device enrollment, Windows Autopilot, policies, application deployment and BitLocker PIN workflows.
• Used Windows scripts and batch tools for administration; maintained access procedures, configuration records and infrastructure documentation.
Chief Information Officer (CIO) | November 2023 - September 2026
LLC “IdealistCoffee” | Ukraine
Scope: IT leadership and infrastructure operations for a multi-location business. Direct engagement ended upon relocation to Cyprus; the company remains within the IT-Avia project portfolio.
• Oversaw IT infrastructure, network connectivity, remote access, business systems, user support, and vendor coordination.
• Supported branch connectivity, VPN access, network reliability, and operational continuity for distributed locations.
• Coordinated IT support, infrastructure improvements, equipment planning, and technical decisions with business management.
• Maintained IT documentation, access control, incident handling, and infrastructure improvement plans.
Project highlights:
• Supported a MikroTik CHR hub with VPN connectivity for seven branch locations, including routing, firewall policies and remote access.
• Supported Hyper-V / Windows services, VPN access, business applications and infrastructure troubleshooting for distributed operations.
IT Engineer / IT Manager / Head of Department | September 2021 - Present
Private firm “IT-Avia” - Kyiv Sikorsky International Airport and related projects | Kyiv, Ukraine
Scope: IT operations for airport infrastructure and client projects. Current work is project-based, outside normal working hours or on weekends; the portfolio includes IdealistCoffee and Globino.
• Administer and support corporate IT infrastructure, including servers, workstations, networks, access rights, and business services.
• Support and coordinate technical operations involving network equipment, server infrastructure, CCTV/ACS, user workstations, and vendors.
• Handle practical troubleshooting, user support, documentation, equipment inventory, and infrastructure improvement tasks.
• Participate in planning and implementation of network, server, security system, and workplace modernization projects.
Project highlights:
• Supported airport infrastructure spanning networking, servers, operational availability and integrated physical security systems.
• Participated in a European Space Agency cyber defense project in 2021 through IT-Avia at Kyiv Sikorsky International Airport.
• Coordinated technical changes, infrastructure documentation, troubleshooting and external vendors for operational systems.
Project Engineer / Telecommunications and Communications Lead Engineer | June 2020 - January 2022
LLC “C3-Energy” - projects with BT Ukraine and A1 Telekom Austria Group | Ukraine
Scope: Telecommunications, network infrastructure, enterprise connectivity, and project-based customer environments.
• Worked on telecommunications and infrastructure projects for enterprise customers and telecom-related environments.
• Supported network and communication systems, equipment deployment, troubleshooting, and escalation handling.
• Coordinated technical work, vendor and client communication, documentation, and project delivery.
• Participated in field and infrastructure activities involving enterprise networks, connectivity, and customer service continuity.
Project highlights:
• Provided technical support and project delivery for engagements involving BT Ukraine and A1 Telekom Austria Group.
• Handled Layer 2/Layer 3 network troubleshooting and stakeholder communication during project delivery.
Lead Telecommunications and Communications Engineer, Tier 2/3 | March 2018 - May 2020
LLC “C3-Energy” outsourcing - onsite “AbbVie Ukraine” and “Microsoft Ukraine” | Kyiv, Ukraine
Scope: Outsourced enterprise support role for international corporate environments.
• Provided Tier 2 / Tier 3 technical support for telecommunications, communications, and IT infrastructure services.
• Supported enterprise users, networking/connectivity issues, incidents, escalations, and service continuity.
• Worked onsite with corporate customers, following enterprise support, communication, and documentation standards.
• Coordinated issue resolution with users, internal teams, vendors, and external service providers.
Project highlights:
• Delivered outsourced onsite infrastructure and communications support for AbbVie Ukraine and Microsoft Ukraine.
• Worked within enterprise incident, escalation, communication, and documentation processes with awareness of service-level commitments.
IT Manager and Support Engineer | April 2017 - September 2026
LLC “Globino” | Ukraine
Scope: Long-term IT administration and support. Direct engagement ended upon relocation to Cyprus; the company remains within the IT-Avia project portfolio.
• Administered and supported users, workstations, network equipment, printers, servers, and business applications.
• Provided troubleshooting, onboarding/offboarding, access management, and day-to-day IT support.
• Supported Windows Server, remote desktop access, file services, MS SQL/BAS workloads, backups and infrastructure documentation.
• Coordinated IT improvements, equipment replacement, vendor communication, and routine maintenance.
Project highlights:
• Supported long-running Windows Server and SQL-backed business systems, user access and network connectivity.
• Handled scheduled backup tasks, operational troubleshooting, access management and infrastructure maintenance.
IT Administrator | May 2016 - March 2017
State Enterprise “Ukrainian Research and Training Center for Standardization, Certification and Quality” | Kyiv, Ukraine
Scope: Internal IT administration and user support in a public-sector / enterprise environment.
• Administered and supported workstations, user accounts, printers, network access, and daily IT operations.
• Provided technical support to users and assisted with troubleshooting hardware, software, and access issues.
• Supported infrastructure maintenance, documentation, and equipment-related tasks.
Experience highlights:
• Supported internal IT services in an organization with formal operational and documentation processes.
Assistant Engineer for UPS Assembly | May 2014 - September 2014
LLC “Pro-Electro” | Ukraine
Scope: Technical assistant role related to UPS assembly and electrical/power equipment.
• Assisted engineers with UPS assembly, technical preparation, and equipment-related tasks.
• Worked with hardware, components, technical documentation, and basic assembly procedures.
• Developed early practical experience with power equipment, reliability, and technical accuracy.
SELECTED INFRASTRUCTURE PROJECTS & PRACTICAL RESULTS
• Linux monitoring stack: provisioned an Ubuntu Server 24.04 LTS VM on hosted Hyper-V infrastructure and deployed Zabbix 7 with a PostgreSQL database and Nginx web frontend; defined SNMP/ICMP checks and critical alerting requirements.
• Multi-site secure connectivity: supported MikroTik CHR hub-and-branch networking across seven branches with WireGuard / other VPN services, firewall/NAT rules and remote access.
• Infrastructure incident handling: investigated suspicious activity on a Proxmox host; isolated suspect artifacts, reviewed relevant configuration and access, and changed administrative credentials.
• Virtualization and business services: administered Hyper-V, Proxmox and VMware environments; configured VMs, networking and storage, supported RDP and MS SQL/BAS workloads, and managed backup tasks.
• Hotel and enterprise networking: supported Radisson, Hilton, Hyatt and Novotel environments; worked with deployments of up to 300 Wi-Fi access points and Ekahau surveys; designed VLAN-segmented hotel networks with Aruba, Fortinet and Grandstream.
• Endpoint and cloud administration: implemented Microsoft Intune policies and Windows Autopilot, Entra ID enrollment and BitLocker PIN; administered Microsoft 365 and email migrations.
• Operational reliability: configured restricted administrative access and IP allowlists, investigated service availability incidents, documented network/server changes and coordinated providers and vendors.
EDUCATION
National Aviation University | 2008 - 2015
Kyiv, Ukraine | Institute of Information and Diagnostic Systems
• Master’s degree; programme taught in English.
• Specialization: Computerized Systems and Automation (Engineer-Researcher).
• Bachelor’s degree in Computer-Integrated Systems, Institute of Aerospace Control Systems.
CERTIFICATIONS AND COURSES
• Grandstream Certified Specialist - Networking Solutions
• Microsoft 365 administration training
• Cisco CCNA training course - 2018
• OWASP Top 10 Pentest / Security QA course - June-July 2024
• Electrical Safety Category 3 - 2020
LANGUAGES
• Ukrainian - Native
• Russian - Fluent
• English - Upper-Intermediate