Олександр

Oleksandr Holikov [open contact info](look above in the "contact info" section)
t.me/Les_Holikov
$ Junior Linux System Administrator
linkedin/holikovoleksandr
Kyiv, Ukraine
github/HolikovOleksandr
[open contact info](look above in the "contact info" section)

SKILLS

Linux Ubuntu/Oracle systemd systemctl journalctl SSH Bash

Monitoring Zabbix server diagnostics log analysis

Network TCP/IP DNS DHCP Nginx Firewall Wireshark Nmap

Containers Docker Docker Compose

Dev tools Git GitHub Actions AWS EC2/S3 Ansible

EXPERIENCE

Freelance — Backend / Infrastructure 2024

Node.js · MySQL · Linux · Docker

› Refactored and extended a NestJS backend API; delivered within agreed timelines
› Deployed application updates to Linux-based VPS environments multiple times
› Managed Dockerized services: container restart, log inspection, environment config
› Configured Nginx as reverse proxy for deployed services
› Worked with MySQL: queries, relations, data consistency

CRM Backend API — Personal Project 2024

NestJS · PostgreSQL · Docker · GitHub Actions

› Dockerized full application stack for local and remote deployment
› Set up basic CI/CD pipeline via GitHub Actions
› Managed PostgreSQL: schema design, migrations, relations
› Deployed and maintained on AWS EC2 instance

TRAINING

PortaOne Learning & Networking Academy (LNA) in progress
Linux administration, networking fundamentals, Bash scripting, screen, systemd, regex — hands-on server environment

PortSwigger Web Security Academy in progress
Server-side vulnerabilities: path traversal, access control, authentication, SSRF, file upload

TryHackMe — Junior Penetration Tester Path in progress
Linux internals, networking, security fundamentals from defensive perspective