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Network security Engineer

Prague, Czech Republic
December 23, 2019

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Dimitrios Leontaris

Phone: +420-********* (CZ)


LinkedIn page:

Born in Athens (Greece)


Master of Engineer in Telecommunication Engineering 2009

DCU Dublin City University, Ireland

Grade: First Class Honors Degree

Thesis: “Packing algorithm for Benes Networks”

BSc in Electronic Engineering 2007

Uniroma3 Terza Universita di Roma (Italy)

Grade: 99 out of 110

Thesis: “The Telaer Remote Sensing System”

Skills Overview

Worked in different companies for multiple years proving tenancy and Loyalty.

Gifted with excellent adaptive skills, responsible to Taking ownership of problems and achieving challenging outcomes.

Able to work to deadlines and under pressure with good communication & management skills.

Qualified with Technical Skills in Networking and Security Area followed through many Vendor Oriented certifications.

Working experience with ASA, Juniper, Checkpoint, SSG Firewalls, F5 & Brocade Load Balancers, GTM/BIGIP, Bluecoat, DNS monitoring tools, IPD/IDS, PKI, ISE

Knowledge of Java and C++ skills, as well good knowledge of C and SQL database.

Work Experience

Dimension Data, Prague (Czech Republic) August 2018-Ongoing

Network Security Engineer

Member of Secure Access in Dimension Data, I am responsible for

supporting and managing DiData clients.

Configuration and Troubleshooting with:

ASA firewall configuration.

Checkpoint firewall changes.

Cisco IPsec & Anyconnect VPN implementation.

Bluecoat Proxy configurations & upgrades.

WLC and Cisco ISE configuration.

CyberArk & account creation & troubleshooting.

Cisco Meraki Network and CMNA Certified.

Cisco Proxy WSA and Email ESA.

Using Spunk as a tool for Network related issues.

Using Infoblox for DNS related request.

Deutsche Börse Group, Prague (Czech Republic) October 2017-August 2018

Network Security Engineer

Member of Secure Access in Deutsche Boerse, I am responsible for

supporting existing services and help business continuity.

Configuration and Troubleshooting with:

F5 LTM & Brocade Load balancer, ASA firewall, IDS/IPS.

Checkpoint Firewalls

Hands on experience with CyberArk & Troubleshooting

Experience using Tufin as a reporting tool and troubleshooting.

Deutsche Post DHL, Prague (Czech Republic) January 2015-October 2017

Network Security Engineer

Member of Build team, I am responsible for implementing existing

services and help to support new products.

Configuration and Troubleshooting with:

CyberArk account & Troubleshooting.

Implementing Cisco Anyconnect, IPsec & GRE VPN.

Firewalls Juniper SRX, SSG, Cisco ASA, Checkpoint.

F5 Load balancer LTM and GTM/3DNS, Application security WAF.

Configuring and designing 3DNS/GTM solution to facilitate.

business continuity or disaster recovery.

PKI, certificates DNS (ipcontrol).

Bluecoat Proxy upgrade policy troubleshooting.

IDS/IPS, monitoring tools.

Deutsche Post DHL, Prague (Czech Republic) January 2014/2015

Network Engineer

Responsible within the Network Operation Center for monitoring, troubleshooting

solving connectivity issues.

Configuration and Troubleshooting with:

Routing Troubleshooting with OSPF EIGRP.

Coordinating engaging and cooperating with multiple ITS teams for

troubleshooting until resolution.

Handling escalation and communication with Business partners.

Investigation to diagnose and resolve all incidents, including

negotiation with end users.

Using specialized techniques, tools methods and standards to

resolve issue as quickly as possible.

AT&T, Brno (Czech Republic) August 2012 February 2014

VoIP Network specialist

Configuration and Troubleshooting with:

Monitoring and troubleshooting, Sonus equipment for switch Networks.

Work with Tier 2 and site technician to troubleshoot issues with GSX equipment (i.e core dumps, card resets card re-seats,) and trunk issues.

Troubleshooting T1/T3.

Symantec, Athens (GR) May 2011/August 2012

Technical Support for Symantec

Configuration and Troubleshooting with:

First and second level Technical support of Symantec

(Backup Anti-virus solution, Netbackup, helping with software upgrades,

license renewals and upgrades.

Other Work Experience

Customer Service Representative, for Telecom Italia Mobile assisting Italian and English customer for mobile plans and products.

Computer Skills

JNCIA routing & switching certified.

Cisco CCNP routing and switching.

Cisco CCNP Security certified.

Candidate for F5 certification 101 & 102

ITILv3 certified

License Number: 5189640.20330797

Training for Cisco Meraki Networks.

IPv6 training for Bluecoat, Checkpoint, F5, Juniper, SSG

SourceFire Training- Alef Nulla Certificate of Completion

Cisco Secure Access Solution INAC Training

F5 LTM, GTM, ASM Boot camp internal training

Java and C++ skills, good knowledge of C and SQL.

Knowledge and use of Unix/Linux OS.

Working experience with Linux/Unix servers.


Greek: Native Language

English: Fluent user

Italian: Fluent user

French: Basic

Czech: Basic


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