Foivos Chatzitheodorou
Ilioupoli
Summary
Offering solid foundation in system security concepts and keen interest in continuous learning within this field. Brings strong ability to quickly adapt to new security technologies and methodologies. Demonstrates strong analytical, communication, and teamwork skills, with proven ability to quickly adapt to new environments. Eager to contribute to team success and further develop professional skills. Brings positive attitude and commitment to continuous learning and growth. Developed technical skills in high-stakes, security-focused environment. Seeking to transition to new field where these skills can drive impactful results.
Overview
6
6
years of professional experience
1
1
Certification
Work History
Junior Systems Engineer
Pronet SA (pronet.ms)
07.2024 - Current
- Configured Claroty Secure Remote Access (SRA) solution on Azure for industrial OT environments (PLCs, HMIs, and industrial equipment) on a RHEL 3.9 Linux base, ensuring secure, audited connectivity for operations teams.
- Built, manually configured, and maintained nested virtualization environments on Microsoft Azure to deliver customizable Windows workstation VMs accessible exclusively via SRA.
- Implemented automated provisioning scripts using PowerShell, Azure CLI, and Python to streamline VM deployment processes.
- Managed Fortinet FortiGate firewalls, performing routine checks (ping, telnet, policy verification) and complex troubleshooting (packet sniffer analysis, VLAN/Gateway/Subnet/DHCP examinations) to enforce security across multi-site networks, and collaborated with network teams to create missing firewall policies.
- Monitored system health using PRTG and conducted packet captures with Wireshark to diagnose and resolve root cause issues, including latency and connectivity problems.
- Conducted regular system audits and patching to maintain a 99.95% uptime SLA.
- Troubleshot VPN connectivity issues for remote users connecting from nested Azure VM workstations to OEM plant assets (PLCs, HMIs), documenting recurring problems and implementing long-term fixes.
- Analyzed system logs for identifying potential issues before they escalated into larger problems.
- Participated in on-call rotations to provide round-the-clock support for mission-critical systems as needed, 24/7 .
- Managed user accounts, permissions, and access controls to maintain a secure computing environment via SRA.
- Managed SRA onboarding of new Vendors.
- Troubleshot and resolved complex technical issues, minimizing disruption to end-users.
- Streamlined processes for increased efficiency by automating repetitive tasks through scripting.
- Optimized server capacity through regular maintenance and resource allocation adjustments.
- Boosted end-user productivity by providing training on essential applications and systems usage best practices.
Height Network Engineer
TELCON DIAMANTIS GREECE
10.2023 - 05.2024
- Installation and maintenance public and private wirless 5G cellars telecommunications systems.
- Installed BTS 5G equipment in various locations.
- Worked on-air with specialized equipment, ensuring proper installation and operation.
- Gained extensive knowledge of electronics related to 5G technology.
- Conducted regular maintenance and troubleshooting of installed systems to ensure optimal performance.
Network Engineer (INTERSHIP)
Cosmote (CTS)
10.2021 - 03.2022
- Developed technical documentation such as user manuals, installation guides and troubleshooting procedures.
- Installed and configured wireless networking equipment.
- Tested circuits and components of malfunctioning telecommunications equipment to isolate sources of malfunctions.
- Replaced defective parts such as connectors, splitters, attenuators.
Storage Manager Of Spare Parts
SKODA , Κ.Κ.ΚΑΛΔΗΣ
06.2019 - 09.2019
- Company Overview: BUSINESS-CAR COMPANY
- Reviewed orders from customers against available stock levels before releasing them for delivery.
- Created and maintained an accurate database of all parts, including pricing information and special order items.
- Monitored inventory levels of products and materials in warehouses.
Education
Bachelor of Science - Computer Engineering,
University Of Thessaly
Larissa, Greece03.2022
Skills
- Linux and Windows administration (Kali, Ubuntu ,Centos 39 and Rhel 39)
- Teamwork and collaboration
- Problem-solving
- Microsoft Office (Word, PowerPoint, Excel)
- Cybersecurity frameworks tools : Nmap , Metasploit , WireShark , FortiClient
- System monitoring
- Scripting languages
- Virtualization technologies
- System troubleshooting
- SecurityCloud services
- TCP/IP protocol
- Network security
Languages
Greek
Bilingual or Proficient (C2)
English
Bilingual or Proficient (C2)
Certification
- Claroty Implementation Engineer (CIE 401) Claroty Implementation Engineer (CIE 401).Issued Oct 2024 · Expires Oct 2026 Issued Oct 2024 Expires Oct 2026Credential ID 1665035953143077010
- Claroty Support Engineer (CSE 501) Claroty Support Engineer. Issued Oct 2024 · Expires Oct 2026 Issued Oct 2024 · Expires Oct 2026Credential ID 1665035900539270973
- Fortinet Certified Associate in Cybersecurity Fortinet Certified Associate in Cybersecurity. Issued Sep 2024 · Expires Sep 2026 Issued Sep 2024 · Expires Sep 2026Credential ID 1159325992FC
- Fortinet Certified Fundamentals in Cybersecurity Fortinet Certified Fundamentals in Cybersecurity. Issued Sep 2024 · Expires Sep 2026 Issued Sep 2024 · Expires Sep 2026Credential ID 7409779697FC
- Microsoft Certified: Azure Fundamentals Microsoft Certified: Azure Fundamentals AZ-900. Issued Sep 2024 · Expires Sep 2026Issued Sep 2024 · Expires Sep 2026Credential ID 912349-EA5V65
- Introduction to Cyber SecurityIntroduction to Cyber Security. Issued Jul 2024 · Expires Jul 2026Issued Jul 2024 · Expires Jul 2026Credential ID THM-OOXCOPMLF2
- IELTS Cambridge British Council English Level : B2 Academic Issued Aug 2023 Expires Aug 2025 Credential ID: 23GR000189CHAF295A
Timeline
Junior Systems Engineer
Pronet SA (pronet.ms)
07.2024 - Current
Height Network Engineer
TELCON DIAMANTIS GREECE
10.2023 - 05.2024
Network Engineer (INTERSHIP)
Cosmote (CTS)
10.2021 - 03.2022
Storage Manager Of Spare Parts
SKODA , Κ.Κ.ΚΑΛΔΗΣ
06.2019 - 09.2019
Bachelor of Science - Computer Engineering,
University Of Thessaly
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