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Systems Operational — Available for Projects

Vasileios Antonopoulos

Systems Engineer · Cloud & Infrastructure Architect

M.Sc. Computer & Telecommunication Systems Security

Explore Stack Download CV Contact
va@portfolio — bash
╭──────────────────────────────────────────╮ │ Va Portfolio — Interactive Terminal CLI │ ╰──────────────────────────────────────────╯
Available commands: help, about, skills, experience, projects, certifications, contact, whoami, date, uptime, neofetch, cat cv.txt
va@portfolio:~$

// Technical Stack

$ cat ~/skills_matrix.json | jq '.[] | .category, .technologies[]'

Cloud & DevOps

Microsoft Azure VMware vSphere Docker Kubernetes OpenShift CI/CD

Infrastructure & Networking

SAN / NAS HP / Dell / Cisco Hw Firewalls TCP/IP Stack OpenStack

Systems Administration

Linux (Ubuntu / CentOS) Windows Server Apache / Nginx Hyper-V / KVM

Security & Directory

Active Directory Hybrid Cryptography Microsoft Defender / Intune Bitdefender MDR

Scripting, Automation & Programming

Python Bash PowerShell SQL PHP Java / C GitHub SAP Jira

// Engineering Experience

$ cat ~/work_history.log | tail -n +1

Space Hellas S.A.

System Engineer

Aug 2025 – Present

📍 Athens, Greece

  • ▸ Deploy, configure, and optimize virtualized/cloud infrastructures using VMware ESXi/vSAN and Hyper-V
  • ▸ Architect Hybrid Cloud configurations & lead physical-to-cloud migrations to Microsoft Azure
  • ▸ Manage enterprise storage solutions (SAN/NAS) across HP, Dell, and Cisco hardware
  • ▸ Monitor Linux services and containerized microservices (Docker, KVM, Nginx, Apache)
  • ▸ Administer Hybrid AD, Intune, Microsoft Defender, Exchange, and MS SQL Server
VMware Azure Docker AD Hybrid SQL Server

Safe Swiss Cloud AG

System Engineer (Freelance)

Mar 2025 – Aug 2025

📍 Zurich, Switzerland

  • ▸ Delivered managed IT services for multiple enterprise clients — optimized security & performance
  • ▸ Designed and migrated VMs/networks using VMware vSphere, vCloud, OpenStack, OpenShift
  • ▸ Containerized applications with Docker and OpenShift, improving scalability
  • ▸ Implemented MDR solutions (Bitdefender GravityZone, OPManager) for threat detection
  • ▸ Automated key processes with PowerShell, Bash, and Python
vSphere OpenShift Docker Bitdefender Python

IBM

Infrastructure Specialist & System Administrator

Sep 2023 – Jul 2025

📍 Athens, Greece

  • ▸ Managed enterprise infrastructure ensuring uptime, performance, and security
  • ▸ Automated SAP billing workflows using Python/PowerShell, reducing manual processing time
  • ▸ Administered mission-critical apps with proactive monitoring and incident resolution
  • ▸ Streamlined IT operations via scripting (PowerShell, Bash, Python)
  • ▸ Maintained IT asset compliance and generated analytical reports for management
SAP Python PowerShell Bash Incident Mgmt

Supreme Military Support Command (SMSC)

Computer Programmer & Analyst

Oct 2022 – May 2023

📍 Athens, Greece

  • ▸ Managed and secured classified IT infrastructure and communications systems
  • ▸ Administered Linux and Windows servers, routers, switches, DHCP, and firewalls
  • ▸ Handled classified information with strict adherence to confidentiality protocols
Linux Windows Networking Security

// Certifications & Education

$ cat ~/credentials.asc

Certifications

Microsoft Certified: Azure Administrator (AZ-104)

Jun 2026

Active

CompTIA Security+ ce

Jun 2026

Active

Dell PowerEdge Operate v2

Jul 2026

Active

Education

M.Sc. Computer & Telecommunication Systems Security

University of Thessaly

2023 – 2025 · Final Grade: 9.03/10

Network Security Cryptography Cloud Computing Big Data

B.Sc. Computer Science & Telecommunications

University of Thessaly

2018 – 2022 · Final Grade: 7.73/10

Academic Excellence Award — M.Sc. Program 2025 · University of Thessaly

// Projects & Architecture

$ ls ~/projects/ — architecture showcases

📚

BookStore E-Commerce

Enterprise-grade full-stack bookstore app with Node.js/Express, React, MongoDB, and Docker. Clean architecture, JWT auth with RBAC, full shopping cart flow, Swagger docs. Dockerized dev & deploy.

Node.js React MongoDB Docker
Source
🔐

Ad-Hoc GPG File Processor

Production-grade Bash script replacing a legacy GPG decryption pipeline. Secure ad-hoc decryption, automated archiving, timestamped logging, and error-safe file handling for sysadmins.

Bash GPG Sysadmin
Source
🏕️

Camp Reservation System

SQL database design with 3NF normalization, indexing, optimized queries, and a data warehouse for analytics/BI reporting. Demonstrates advanced database engineering and performance tuning.

SQL Data Warehouse 3NF
Source
🔒

Secure Hashing & Data Mgmt

Python toolkit for SHA-256 hashing, twin-file creation (share/storage), statistical analysis, and database insertion/decryption. Built for secure data handling in enterprise contexts.

Python SHA-256 Security
Source
🏠

Home Server Infrastructure

Self-hosted ecosystem running Nextcloud, Vaultwarden, VPN, Uptime Kuma, Grafana monitoring, and SFTPGo — all behind a wildcard SSL on an Ubuntu stack. Full remote access & observability.

Nextcloud Vaultwarden Docker Uptime Kuma
Live
🎄

Advent of Code Solutions

Complete Python solutions for Advent of Code events (2015-2017, 2024). Algorithmic problem-solving covering graph traversal, dynamic programming, parsing, and combinatorial optimization.

Python Algorithms
Source

Beyond the Terminal

Lego Mindstorm EV3 Robotics Compiler Design Instructor Photo/Video Editing PC Building