Sign in

Network security Engineer

Prague, Prague, Czech Republic
April 25, 2019

Contact this candidate


Dimitrios Leontaris

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


LinkedIn page:

Current location: Prague, Czech Republic

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 University of Rome (Italy)

Grade: 99 out of 110

Thesis: “The Telaer Remote Sensing System”

Skills Overview

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

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

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

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

Working experience: ASA, Juniper SRX, Checkpoint, SSG Firewalls, F5 & Brocade Load Balancers, GTM/3DNS, Proxy, DNS monitoring tools, IPD/IDS, PKI.

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 I am taking care of any operational issues as well of change

management of client devices.

Experience with:

ASA firewall configuration & troubleshooting.

Checkpoint firewall, CyberArk account and troubleshooting.

Cisco IPsec VPN creating and troubleshooting.

Bluecoat Proxy configurations & Troubleshooting.

Hands on experience with Cisco ISE

Hands on experience with Cisco Meraki Networks.

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 to help business continuity.

Experience with:

F5 LTM & Brocade Load balancer.

Checkpoint Firewalls, ASA firewall, IDS/IPS.

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 the implementation and support of

existing services and products.

Experience with:

Implementing and troubleshooting IPsec VPN.

Juniper SRX, SSG, ASA, Checkpoint Firewalls.

Implementing and troubleshooting F5 Load balancer LTM.

Experience with Application security F5 WAF.

Configuring and designing 3DNS/GTM solution to facilitate business continuity or disaster recovery.

PKI, certificates DNS and troubleshooting.

Configuring and troubleshooting AnyConnect VPN using Cisco ASA for client to site VPN.

Bluecoat Proxy upgrade policy & troubleshooting.

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

Network Engineer

Member of the Network Operation Center (NOC) I am providing a first level

support when connectivity issues occurs.

Experience with:

Routing Troubleshooting with OSPF, EIGRP and BGP.

Engaging and cooperating with multiple ITS teams for troubleshooting until resolution.

Handling escalation and communication with Business partners.

Investigation to diagnose and resolve incidents.

Using specialized techniques, tools methods to resolve issue as quickly as possible.

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

VoIP Network specialist

Experience with:

Monitoring and troubleshooting, Sonus equipment for AT&T circuit 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 lines.

Symantec, Athens (GR) March 2011-August 2012

Technical Support for Symantec

Experience with:

First and second level Technical support for Symantec products including Backup Anti-virus solution

Assisting customer with software upgrades, license renewals.

Computer Skills

JNCIA routing & switching certified.

CCNA Security certified.

CCNP Security candidate

CCNP routing and switching.

ITILv3 certified.

Internal Training for Bluecoat Proxy, Checkpoint, Juniper, SSG Firewalls.

ISE Training.

F5 LTM, GTM, 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

Czech: Basic

References use only when authorized

Please Ask for references.

Contact this candidate