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Spyros TselentisST
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Spyros Tselentis

@spyrostselentis

Network Infrastructure Engineer at NETWORK DATA ENGINEEROTE securing hybrid Azure networks and achieving 99.9%+ uptime.

Greece
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At NETWORK DATA ENGINEEROTE, I manage enterprise networks across Azure and on-premises environments, including deployments for global organizations like Coca-Cola. I achieved 99.9%+ uptime through proactive monitoring and automated operations.

I implemented zScaler SASE and Guardicore micro-segmentation to improve threat protection and eliminate legacy VPN vulnerabilities. I also automated inventory management and switch configurations to reduce manual work.

Earlier, as a Junior Network Engineer at TITAN, I configured Cisco infrastructure, Azure virtual networks, and secure hybrid connectivity. My experience also includes FTTH installation and splicing optical fibers, as well as deploying network equipment in the field.

Experience

Work history, roles, and key accomplishments

TI

Junior Network Engineer

Titan

Feb 2024 - Sep 2024 (7 months)

Installed and configured Cisco network equipment, utilized Ansible for automation, and managed advanced routing protocols including BGP and MPLS. Designed Azure virtual networks and implemented secure hybrid network solutions.

KE

FTTH Engineer

Kourassis Electrical Engineering

Jan 2023 - Jan 2024 (1 year)

Installed and spliced optical fibers, ensuring reliable internet connectivity. Collaborated with ISPs to maintain seamless network operations and met project deadlines under adverse conditions.

VM

Field Technician

Vision Mavridakis

Sep 2021 - Jan 2023 (1 year 4 months)

Installed and configured access points, switches, racks, and routers. Implemented VLANs and RIP protocols, and collaborated on system integration projects including CCTV and fire alarms.

Education

Degrees, certifications, and relevant coursework

Check Point logoCP

Check Point

Check Point Certified Security Administrator, Network Security

Earned the Check Point Certified Security Administrator certification in 2026.

Fortinet logoFO

Fortinet

Fortinet Certified Professional Secure Networking, Network Security

Earned the Fortinet Certified Professional Secure Networking certification in 2026.

Cisco logoCI

Cisco

Implementing and Operating Cisco Enterprise Network Core Technologies, Networking

Earned the Implementing and Operating Cisco Enterprise Network Core Technologies certification in 2025.

Cisco logoCI

Cisco

Implementing and Configuring Cisco Identity Services Engine, Network Security

Earned the Implementing and Configuring Cisco Identity Services Engine certification in 2025.

Microsoft logoMI

Microsoft

Designing and Implementing Microsoft Azure Networking Solutions (AZ-700), Cloud Networking

Earned the Designing and Implementing Microsoft Azure Networking Solutions (AZ-700) certification in 2024.

Microsoft logoMI

Microsoft

Azure Fundamentals (AZ-900), Cloud Computing

Earned the Azure Fundamentals (AZ-900) certification in 2024.

Microsoft logoMI

Microsoft

Azure Administrator Associate (AZ-104), Cloud Computing

Earned the Azure Administrator Associate (AZ-104) certification in 2024.

Cisco logoCI

Cisco

Cisco Certified Network Associate, Networking

Earned the Cisco Certified Network Associate certification in 2022.

Hellenic Mediterranean University logoHU

Hellenic Mediterranean University

Electronic Engineer, Electronic Engineering

2015 - 2020

Pursued a degree in Electronic Engineering from 2015 to 2020.

Tech stack

Software and tools used professionally

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