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VALERII SHAIDA
System Administrator | Linux, Networking, Infrastructure Automation
Kyiv, Ukraine | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | Linkedin | GitHub

SUMMARY
System Administrator with 3 years of commercial experience in Linux and Windows Server administration, office
networking and infrastructure automation. Hands-on with self-hosted production infrastructure: BIND9, Nginx, TLS and
firewall hardening. Automates recurring operations with Python and Bash, and builds monitoring on top of Zabbix.
Currently completing a Master’s in Computer Science at Taras Shevchenko National University of Kyiv. English B2.
TECHNICAL SKILLS
Operating Systems: Linux (Debian, Ubuntu, CentOS), Windows Server
Networking: TCP/IP, OSI model, NAT, routing, DNS (BIND9), firewall rules
Security: ufw, iptables, fail2ban, SSH key-based authentication, Let’s Encrypt TLS
Directory & Access: Active Directory, LDAP, RDP
Web & Services: Nginx (web server, reverse proxy), Apache
Databases: SQL — user management, backups, routine queries
Monitoring: Zabbix (API, trapper items, custom checks)
Scripting & Automation: Python, Bash, Git
Additional: C#, C++
PROFESSIONAL EXPERIENCE
System Administrator — ITSource Group, Kyiv 2023 – June 2026
• Administered Linux (Debian, Ubuntu, CentOS) and Windows Server machines supporting ~100 users
• Managed user accounts and access rights via Active Directory and LDAP
• Configured office networking: NAT, routing, DNS and firewall rules
• Provided L1/L2 technical support and support remote users over RDP, handling approximately 30 requests per week
• Maintained SQL databases: user management, scheduled backups and routine queries
• Automated recurring administration tasks with Python and Bash scripts
• Built anomaly detection on top of Zabbix monitoring: retrieved time-series metrics through the Zabbix API, combined
Holt-Winters forecasting with Z-score detection for traffic and wireless metrics, and returned anomaly status to Zabbix
via zabbix_sender and a trapper item

PROJECTS
Self-hosted VPS Infrastructure personal project
• Provisioned and hardened a Debian VPS from scratch: SSH key-only access, ufw firewall, fail2ban
• Deployed BIND9 as an authoritative DNS server: zone files, records, troubleshooting with dig
• Configured Nginx as web server and reverse proxy with Let’s Encrypt TLS and automatic certificate renewal
• Configured Apache virtual hosts for a legacy application
• Wrote Bash scripts for scheduled backups and basic service monitoring
EDUCATION
Master’s in Computer Science — Taras Shevchenko National University of Kyiv, 2025 – 2027 (expected)
Bachelor’s in Computer Engineering — Taras Shevchenko National University of Kyiv, 2021 – 2025
CERTIFICATIONS & AWARDS
Huawei ICT Competition — Global Final, 3rd prize
NDG Linux Unhatched
PCAP: Programming Essentials in Python
Cisco IT Essentials: PC Hardware & Software
ITVDN: C# 8.0 Starter
LANGUAGES
Ukrainian — Native | English — B2 (Upper-Intermediate)