Володимир

VOLODYMYR CHETVERTYNIVSKYI
Junior System Engineer / Infrastructure Support Engineer
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | Vinnytsia, Ukraine
GitHub: github.com/Mrkopir | LinkedIn: vova-chetvertynivskyi | Portfolio: chetvertynivskyi.com

KEY SKILLS PROFILE
• Linux administration: CLI, users/groups, Cybersecurity student focused on practical system administration, infrastructure support and
permissions, processes, services, systemd, technical troubleshooting. I have hands-on experience with Linux servers, Docker-based
journalctl and log analysis. services, Nginx reverse proxy, SSL/TLS setup, logs and secure configuration of a public web
• Windows administration basics: user support, project.
system settings, software troubleshooting and
workstation configuration. I am interested in a System Engineer / Technical Support Engineer role where I can grow in
• Networking basics: TCP/IP, DNS, DHCP, routing
user support, infrastructure migration and setup, Linux/Windows administration, networking,
concepts, ports, firewalls, HTTP/HTTPS and development environment support and cybersecurity-oriented infrastructure practices.
connectivity troubleshooting.
• Infrastructure support: Docker, Docker Compose, PRACTICAL EXPERIENCE AND PROJECTS
Nginx reverse proxy, SSL/TLS, domains,
Personal Portfolio Infrastructure - chetvertynivskyi.com
environment variables and service restart policies.
• Troubleshooting: reading errors, checking logs, • Deployed a personal portfolio website with separate frontend and backend services and public
reproducing issues, isolating causes and access through a custom domain.
documenting fixes. • Configured Docker and Docker Compose for service isolation, environment-based configuration,
• Support workflow: ticket-style thinking, local port binding and restart policies.
prioritization, escalation awareness, short technical • Configured Nginx as a reverse proxy for frontend/backend routing, HTTPS access and
notes and checklists. domain-based traffic handling.
• Security mindset: secrets management, least • Set up SSL/TLS and troubleshot certificate, browser security, Nginx configuration and service
privilege basics, secure API configuration, rate availability issues.
limiting, security headers and basic hardening.
• Worked with Linux server logs, container logs, Nginx logs and application logs to debug
• Development environments: Git/GitHub workflow, deployment and runtime problems.
Node.js/NestJS basics, REST API,
• Used Git/GitHub for version control, documentation and deployment-related notes.
JavaScript/TypeScript and local environment setup.
Infrastructure Support and Security Practice
TOOLS • Implemented secure configuration practices for a public contact API: environment variables for
Linux, Windows, Docker, Docker Compose, Nginx, secrets, .env excluded from Git and controlled CORS policy.
Git, GitHub, SSL/TLS, Node.js, NestJS basics, REST API, • Added DTO validation, rejection of unexpected fields, rate limiting, honeypot protection, security
basic monitoring/logging concepts headers and request body size limits.
• Practiced structured troubleshooting by reproducing errors, checking service logs, identifying
EDUCATION root causes and documenting fixes.
Vinnytsia National Technical University • Started building QC/testing practice for backend services: DTO validation tests, service/controller
Cybersecurity of Information Technologies and unit tests and API/e2e tests before CI/CD.
Systems
2024 - 2028
Cybersecurity and Infrastructure Learning Portfolio - github.com/Mrkopir
• Document learning notes and practice materials on Linux, networking, Docker, Nginx, API
CERTIFICATES security and Blue Team basics.
• TryHackMe - Pre Security Path • Continue practical labs on TryHackMe related to networking, Linux/Windows fundamentals, web
attacks and security monitoring.
• Cisco - IT Essentials
• Cisco - Networking Basics
• Build the habit of explaining technical work clearly: what was configured, what broke, how it was
debugged and how it can be improved.
• Cisco - Introduction to Cybersecurity
• TryHackMe - Cyber Security 101 (in progress) RELEVANCE TO SYSTEM ENGINEER ROLE
LANGUAGES • Can assist users with basic system, software and environment configuration issues.
• Can support Linux-based services, Docker Compose stacks, Nginx configuration, logs and
Ukrainian - native
deployment troubleshooting.
English - pre-intermediate; can read technical
documentation and communicate on basic technical • Have a strong foundation in networking basics: DNS, DHCP concepts, TCP/IP, ports, routing
topics basics and firewalls.
• Ready to grow in Windows administration, Active Directory, domain services, GPO and
FOCUS hypervisor management under mentorship.
Junior System Engineer • Can prepare short runbooks, checklists and technical notes for support, troubleshooting and
infrastructure tasks.
Linux / Windows administration
Technical troubleshooting ADDITIONAL INFORMATION
Networking basics Open to junior System Engineer, Technical Support Engineer, Junior DevOps or infrastructure
Docker / Nginx support support positions. Especially interested in Linux/Windows administration, networking,
Infrastructure security troubleshooting, infrastructure security, CI/CD basics and Ansible/Python learning.