06/30/2026 updated

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Network/Security Engineer

Stupava, Slovakia
Only remote
2011
Stupava, Slovakia
Only remote
2011

Profile attachments

CV_Lubos_Kejmar.pdf

Application FirewallInformation SystemsNetworking HardwareVirtual Private Networks (VPN)Internet Service ProviderPython (Programming Language)Network TroubleshootingMicrosoft VisioWeb ApplicationsWireless Access PointWireless NetworksNetwork RoutersLoad BalancingIn-Plane Switching (IPS)Firewalls (Computer Science)JuniperPalo Alto NetworksCheck Point FirewallsCisco
Cisco, firewalls, IPS, Information systems, Informatics, Computer Science, ISPs, Juniper, VSX, routers, Network troubleshooting, network equipment, Python, VPNs, Web based, access points, cisco wireless

Experience

Professional experience10+ years
Freelancer since2023

Languages

GermanBasic knowledgeEnglishFluentSlovakNative speaker

Project history

Global Network & Security L2/L3 Engineer

OP mobility

Automotive & Vehicle Manufacturing

500-1000 team member

Im OPmobility-Projekt unterstütze ich den Betrieb und die Weiterentwicklung einer globalen Netzwerk- und Security-Infrastruktur mit Fokus auf Firewalls, Routing, VPN und SD-WAN.
Zu meinen Aufgaben gehören Palo-Alto-Firewall-Deployments für neue Standorte sowie Refresh- und Migrationsprojekte bestehender Sites. Dabei migriere ich Standorte mit Legacy-Infrastruktur auf eine neue standardisierte Netzwerk- und Security-Plattform.
Die Umsetzung umfasst die Analyse der bestehenden Umgebung, Anpassung und Übernahme von Security Policies, NAT, Routing und VPN, die Integration in Panorama sowie Cutover-, Test- und Rollback-Planung. Ziel ist eine sichere Migration mit möglichst geringer Auswirkung auf den laufenden Produktionsbetrieb.
Ich koordiniere Changes mit lokalen IT-Teams, Providern und weiteren technischen Ansprechpartnern und führe die Umsetzung in abgestimmten Wartungsfenstern durch. Zusätzlich bearbeite ich komplexe Netzwerkprobleme, Resiliency-Projekte, Routing-Anpassungen und technische Dokumentationen.
Technologien: Palo Alto, Check Point, Cisco, Versa SD-WAN und Zscaler.

Network Implementation Engineer

Canadian Imperial Bank of Commerce; Enterprise services s.r.o (DXC)
Address : Bratislava (Slovakia)

Technical responsibility for the client's network environment, for implementation of different technologies,
switches, firewalls, F5 Loadbalancers, Bluecoat proxies, riverbeds and change tasks, projects, providing technical
network skills to the delivery centers and the Customer. Contributes to project related activities by implementing
planned network changes, HW refreshes or upgrades.

Network Implementation Engineer

HP Grain Slovakia s.r.o
Address : Bratislava (Slovakia)

Technical responsibility for the client's network environment, for implementation of different technologies,
switches, firewalls, F5 Loadbalancers, Bluecoat proxies, riverbeds and change tasks, projects, providing technical
network skills to the delivery centers and the Customer. Contributes to project related activities by implementing
planned network changes, HW refreshes or upgrades.

Network system engineer

AT&T GNS
Address : Bratislava (Slovakia)

Provide configurations for variety of network equipment - Cisco / Juniper (routers, switches). Perform installations
where majority of whole network campus gets swapped including pre-work, tickets for changes, right after
installation support for customer, decommission of sites, new site installations, updating configurations
according customer needs. Installations where campus design gets changed from logical & physical perspective.

Network technical support agent

HP Ajilon Consulting Ltd.
Address : 45 Mlynske Nivy, Apollo Business Center, 821 09 Bratislava (Slovakia)

Monitoring and basic troubleshooting of network devices mostly Cisco, HPN, Firewalls, VPNs, Cooperation with
customers and ISPs for expedited solving of network issues.

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