DevOps Engineer / System Administrator with commercial experience in deployment automation, CI/CD, containerization, Kubernetes, Linux / Windows Server administration, networking, monitoring, and PostgreSQL. I complement professional experience with hands-on DevOps projects covering Infrastructure as Code, GitHub Actions, and performance testing.
Portfolio focus: Infrastructure as Code · Linux · Containers · Kubernetes · CI/CD · Automation · System Administration
<aside>
<img src="/icons/gears_lightgray.svg" alt="/icons/gears_lightgray.svg" width="40px" />
Target roles: DevOps Engineer · System Administrator
Work format: Remote · full-time / part-time / project-based
Location: Vietnam
</aside>
<aside>
📦
Main GitHub portfolio: DevOps-Portfolio - a six-project monorepository with preserved Git history, four active GitHub Actions workflows, and a live CI/CD demo.
</aside>
Experience and Practice
Professional Experience and Internships
January 2026 - Present | DevOps & Development Projects - DevOps Engineering and Development
Developing hands-on infrastructure and application projects focused on Terraform, Ansible, Docker, Kubernetes, Helm, GitHub Actions, GHCR, PostgreSQL, Linux, and CI/CD. The portfolio includes Orders Platform, Kubernetes Flask, CI/CD Demo, and Planner, with detailed evidence in GitHub and the project pages below.
February 2025 - September 2026 | Cybertech-Signal - DevOps Engineer
- Automated standard environment preparation in Selectel and Timeweb using Terraform for infrastructure and virtual machines, Ansible for server configuration, and GitLab CI for execution. Estimated preparation time was reduced from 2-3 hours of manual work to 5-10 minutes.
- Developed GitLab CI/CD and GitOps processes with reusable build, test, and Docker image publishing pipelines, plus delivery through Helm and ArgoCD to Development, Staging, and Production.
- Optimized Dockerfiles for C++, Go, and Next.js services using multi-stage builds, reducing image sizes by approximately 40-50%.
- Deployed Kubernetes clusters with kubeadm and worked with Nginx Ingress, Traefik, Helm, Deployments, Services, ConfigMaps, Secrets, readiness/liveness probes, HPA, and basic AWS ALB usage.
- Supported Prometheus, Grafana, and Zabbix monitoring, dashboards, Telegram alerts, and infrastructure incident diagnostics.
- Optimized PostgreSQL using pg_stat_statements, slow query logs, and EXPLAIN ANALYZE, adjusting indexes, SQL, and database parameters. Prometheus data for the selected period indicated an estimated CPU reduction of about 40%.
- Automated administrative tasks and test-environment preparation with Bash and Python, including backups, archive verification, log rotation, and internal API integrations.
- Administered Linux services, GitLab CE, Keycloak, Nginx, and HAProxy, and supported GPU resources for LLM services and operational documentation.
September 2023 - January 2025 | CBI LLC - System Administrator
- Administered Cisco and MikroTik networking, including VLAN, LACP, routing, NAT, segmentation, and network troubleshooting.
- Configured and maintained IPsec and WireGuard VPN connectivity between offices.