09/14/2026 updated
100 % available
IT-Security Engineer & Architect
Bar, Montenegro
Worldwide
Car Body and Vehicle Builder, Office Administrator :-)About me
IT Security Engineer and Architecture Consulting We support companies in the DACH region, the Balkans, and Georgia in the design, security, and modernization of their IT infrastructure.
ProxmoxActive DirectoryApplication FirewallInternet SecurityKerberos (Protocol)Network SecurityLightweight Directory Access Protocols (LDAP)IT ArchitectureFirewalls (Computer Science)IT Security SolutionsFortinet
Als IT Security Engineer und Architekt mit über 25 Jahren Erfahrung unterstütze ich Unternehmen im DACH-Raum, Balkan und Georgien bei der Absicherung und dem Betrieb ihrer IT-Infrastruktur. Mein Fokus liegt auf pragmatischen, belastbaren Sicherheitslösungen – von der Konzeption bis zum laufenden Betrieb.
Schwerpunkte:
- Firewall & Netzwerksicherheit: Fortinet/FortiGate, Checkpoint – Design, Migration, Hardening
- Web Application Firewall: HAProxy in Kombination mit OWASP Coraza WAF, inkl. Custom-Rule-Tuning und Absicherung von Exchange/OWA-Umgebungen
- Virtualisierung: Proxmox VE (Cluster, HA, Backup-Strategien)
- SIEM & Monitoring: Wazuh (Detection Engineering, Active Response, Agent-Rollout via GPO, Integration von Syslog-Quellen, Endpoint-Schutz), Prometheus/Grafana
- Verzeichnisdienste & SSO: Active Directory, Keycloak (LDAP/OIDC/SAML/Kerberos)
- Exchange Security: Absicherung von on-prem Exchange-Umgebungen, CVE-Tracking, Patch-Management
Branchenerfahrung: Banken, Versicherungen, Automotive, Energie sowie KMU – von regulierungsgetriebenen Umgebungen bis zu schlanken Mittelstandsinfrastrukturen.
Ich arbeite selbstständig über meine Firma Net-Defense D.O.O. und biete flexible, remote-first Zusammenarbeit für Projekte im gesamten DACH-Raum.
Experience
Professional experience10+ years
Freelancer since2007
Languages
GermanNative speakerEnglishGood
Project history
- Consulting: Proxmox Virtualization / Security Architecture
- IT Network Redesign, Virtualization & Security, UniFi WiFi and Security
- Maintenance Services: Firewall Policies, VPN, Proxmox SASS / Containers / Machines, Update Services, Log Management
- Planning, design, and implementation of a two-tier security architecture
- Design of firewall policies for two data centers including branch offices
- Consulting and Design, and implementation of future projects based on the new security architecture.
- Administration of various customer infrastructures for well-known companies,
- Various products including Fortinet, Palo Alto, Juniper, pfSense, Sophos, etc.
- Independent projects in the areas of firewalls, web application firewalls, and two-factor authentication
- Troubleshooting and 2nd/3rd level support, internationally, in the areas of infrastructure, firewalls, and VPNs
- Customer consulting on security infrastructures
- Planning, design, and implementation of security architectures