Personal information hidden

Dmytro Berezhnyi
Odesa, Ukraine | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | LinkedIn | GitHub

SUMMARY
Technical Support Engineer with a strong infrastructure focus and hands-on experience in Linux systems, web server administration,
networking, and infrastructure troubleshooting. Experienced in supporting web services and hosting environments, working with Nginx,
Apache, DNS, HTTP/HTTPS, SSL/TLS, SSH, log analysis, and resolving client-side and server-side technical issues.
CKA-certified with practical experience in Kubernetes, Docker, monitoring, CI/CD, and automation through hands-on infrastructure
projects. Skilled in incident investigation, system and network troubleshooting, technical documentation, and escalation of complex
issues with relevant technical context.

TECHNICAL SKILLS
Linux & System Administration Ubuntu, Debian, RHEL-based systems, SSH, system troubleshooting, log
analysis
Networking & Infrastructure TCP/IP, DNS, DHCP, IP addressing, routing, NAT/PAT, firewalls,
VPS/hosting environments
Monitoring & Observability Zabbix, Prometheus, Grafana, Alertmanager, ELK Stack (basic)
Web & API Nginx, Apache HTTP Server, HTTP/HTTPS, REST APIs (basic), JSON,
HTTP status codes, curl, Postman, SSL/TLS
Containers & Orchestration Docker, Docker Compose, Kubernetes
Automation & Scripting Ansible, Bash, Python
Virtualization & Provisioning Vagrant, libvirt/KVM, VirtualBox
Version Control & CI/CD Git, GitHub, GitHub Actions, GitLab CI/CD (basic)
Databases PostgreSQL, SQL (basic)
Ticketing & Incident Management Internal helpdesk/ticketing systems; Jira Service Management (familiar)

CERTIFICATIONS
CKA: Certified Kubernetes Administrator - The Linux Foundation | Apr 2026 - Apr 2028
Credential ID: LF-yz6ws5nr1g
DevOps Course Graduate - Hillel IT School | 2025
Credential ID: 25803977

PROFESSIONAL EXPERIENCE
Technical Support Engineer (Web Server & Platform Support)
Callstar | 06/2022 - 04/2026
• Supported an e-commerce affiliate platform and handled technical requests from webmasters and affiliates through internal ticketing
and messaging channels, investigating incidents using application and web server logs.
• Troubleshot storefront, checkout, DNS, SSL/TLS, hosting, and connectivity issues, isolating problems across client environments, web
servers, and application infrastructure.
• Configured and troubleshot Nginx and Apache and assisted with PHP configuration, extensions, resource limits, and common Linux
hosting issues.
• Diagnosed store installation and update failures involving file permissions, disk space, HTTP/POST requests, DNS resolution, and
backend/feed connectivity.
• Documented troubleshooting steps and resolutions, prepared bug reports with logs and reproduction details, and escalated
application defects to developers.

PROJECTS & PRACTICAL EXPERIENCE
Monitoring HA Stack
GitHub Repository
Built a Docker Compose-based monitoring and observability environment with Grafana active-active HA behind Nginx and a shared
PostgreSQL backend, Prometheus primary/replica with federation, Alertmanager with Telegram notifications, exporters, TLS,
authentication, and automated bootstrap.
Stack: Prometheus, Grafana, Alertmanager, PostgreSQL, Nginx, Docker Compose, Pushgateway, node_exporter, cAdvisor

DevOps Pet Project
GitHub Repository
Built an end-to-end DevOps project around a Go service with PostgreSQL connectivity. Used a multi-stage Docker build and GitHub
Actions to build and push latest and commit-specific images to Docker Hub, with Kubernetes configuration for deployment.
Stack: Go, PostgreSQL, Docker, GitHub Actions, Docker Hub, Kubernetes

Platform Engineering Lab
GitHub Repository
Provisioned a reproducible four-node Ubuntu 22.04 lab with Vagrant and libvirt/KVM: a management node, control-plane node, and two
workers on a private network. Used Ansible inventory and automation for Linux configuration and Kubernetes infrastructure
experiments.
Stack: Linux, Vagrant, libvirt/KVM, Ansible, SSH, Kubernetes

ADDITIONAL EXPERIENCE
Third Officer / Deck Cadet
V.Ships Crew | 2016 - 2022
• Third Officer (2019 - 2022): Responsible for bridge watchkeeping, safe navigation, updating navigational charts/publications, and
maintaining life-saving and firefighting appliances. Managed technical documentation and port clearance procedures.
• Deck Cadet (2016 - 2017): Assisted in navigation, vessel maintenance, and safety inspections under senior officers' supervision.
Senior Glo Expert
British American Tobacco | 09/2018 - 12/2018
• Conducted product presentations, managed B2C sales, and processed customer databases (cold and warm leads).

EDUCATION & LANGUAGES
Bachelor's Degree in Sea and River Transport English: Intermediate (B1)
Specialization: Navigation | National University "Odessa Maritime Academy" | Graduated: 2017 Ukrainian: Native