Андрій

Denezhko Andriy
System Administrator
About me:
I am a detail-oriented and proactive IT specialist with hands-on
experience in system administration, cloud infrastructure, and
[open contact info](look above in the "contact info" section) automation. I enjoy improving system reliability, reducing manual
[open contact info](look above in the "contact info" section) work through scripting, and building secure, scalable
environments. I thrive in teams where logic, documentation, and
Ukraine, Odesa
performance metrics drive technical decisions.

Education Work experience:
National University IT infrastructure engineer
IphotoTeam
“Одеська Політехніка”
04.2024 - 03.2025
Specialization: Computer Science Administered and optimized PostgreSQL databases for CRM
09.2023 - 06.2026
systems, including configuring backups and performance
Hillel IT Course : Linux/Devops monitoring.
Deployed and maintained CRM infrastructure on AWS (EC2).
Managed DNS records (A, CNAME, MX, TXT) using Cloudflare.
Skills Set up and maintained secure VPN tunnels (WireGuard/IPSec)
VIRTUALIZATION AND CONTAINERIZATION:
HYPER-V between central servers and remote terminals.
VMWARE ESXI
DOCKER / DOCKER COMPOSE Monitored traffic using Prometheus + Grafana, fine-tuned metrics
NETWORKING TECHNOLOGIES: and alerting thresholds.
TCP/IP
VPN (WIREGUARD) Automated incident response using Bash and Python scripts
IPSEC
VLAN
(reduced reaction time by ~30%).
DNS
DHCP
Administered Linux-based systems (AWS EC2), applied security
NAT / PORT FORWARDING patches, managed firewalls.
FIREWALL (IPTABLES / NFTABLES / MIKROTIK)
SNMP Performed system performance monitoring (CPU/RAM/Disk) using
OPERATING SYSTEMS: Grafana, planned migrations with zero downtime.
WINDOWS SERVER / DESKTOP
LINUX: UBUNTU, CENTOS Improved system reliability by implementing proactive monitoring
WINDOWS GPO / ACTIVE DIRECTORY
and alerting workflows.
MONITORING AND TOOLS:
PROMETHEUS Collaborated with developers and QA to ensure infrastructure met
GRAFANA
ZABBIX
scalability and security requirements.
STORAGE SYSTEMS: Junior System Administrator
QNAP
RAID Domashni Systemy LLC
RSYNC
08.2023 - 03.2024
SCRIPTING AND PROGRAMMING:
PYTHON Installed, configured and supported operating systems (Windows
BASH SCRIPTS
POWERSHELL Server, Linux).
DATABASES:
Managed user accounts and access policies (Active Directory,
POSTGRESQL
LDAP).
VERSION CONTROL & CI/CD: Performed initial configuration of networking equipment (Cisco,
GIT (GITHUB / GITLAB)
GITHUB ACTIONS (BASIC CI) MikroTik).
Configured and verified backup systems (Veeam, rsync).
Diagnosed and resolved hardware/software issues (1st and 2nd
Language line support).
Ukranian: Native Documented internal procedures and created guides to reduce
English: B1 onboarding time.
Spanish: B1
Performed component-level troubleshooting and replacement
(HDD, RAM, power supplies, motherboards).
Provided on-site and remote support for hardware issues, ensuring
minimal downtime for clients.