Viktor Kliewer - Network Security Consultant

Q: Where is Viktor based?

Viktor is based in Kalletal, Germany and can operate in on-site , hybrid , and remote work models.

Q: What languages does Viktor speak?

Viktor speaks the following languages: German (Native), English (Advanced) .

Q: How many years of experience does Viktor have?

Viktor has at least 14 years of experience. During this time, Viktor has worked in at least 10 different roles and for 7 different companies . The average length of individual experience is 1 year and 2 months . Note that Viktor may not have shared all experience and actually has more experience.

Q: What is Viktor's latest experience?

Viktor's most recent position is Security Operator at Pfeifer und Langen IT-Solutions GmbH .

Q: What companies has Viktor worked for in recent years?

In recent years, Viktor has worked for Pfeifer und Langen IT-Solutions GmbH , VdS Schadensverhütung GmbH , QITS GmbH , Pfeifer und Lange IT Solutions , and Melitta .

Q: Which industries is Viktor most experienced in?

Viktor is most experienced in industries like Healthcare , Food and Beverage , and Information Technology . Viktor also has some experience in Insurance .

Q: Which business areas is Viktor most experienced in?

Viktor is most experienced in business areas like Information Technology , Project Management , and Operations .

Q: Which industries has Viktor worked in recently?

Viktor has recently worked in industries like Food and Beverage , Information Technology , and Healthcare .

Q: Which business areas has Viktor worked in recently?

Viktor has recently worked in business areas like Information Technology , Project Management , and Operations .

Recommended expert

Kalletal, Germany

Check rate

Experience

Mar 2026 - Present

3 months

Hybrid

Security Operator

Pfeifer und Langen IT-Solutions GmbH

Operational management of a hybrid Palo Alto Networks firewall infrastructure within an IoT environment
Network zoning using VLANs
Analysis, optimization, and hardening of the rule set
Deployment of additional firewalls into the infrastructure
IP address management
Security operations of the IoT NDR solution from Nozomi Networks
Security operations of the honeypot infrastructure from secXtreme
Vendor management to ensure and implement required network measures
Communication with clients and vendors in an international environment
Technologies used: Palo Alto Networks, Panorama, Palo Alto AWS cloud firewall, Nozomi Networks, Honeybox

Feb 2026 - Present

4 months

Security Operator & Project Manager

VdS Schadensverhütung GmbH

Analysis of routing configuration in the network environment (firewall and core)
Migration of the server network to a private cloud
Optimization of routing configurations
Optimization of network topology
Technical project management for network renewal
Technologies used: Palo Alto Networks

Jan 2026 - Present

5 months

Security Operator

QITS GmbH

Analysis of routing configuration in the network environment (firewall and core)
Migration of network gateways/VLANs from the core switch to the firewall
Segmentation of the network for valid communication between network participants
Optimization of routing configurations
Implementation of optimizations and security measures in the existing firewall rule set
Best-practice adjustments in the firewall environment
Optimization of network topology
Technologies used: Palo Alto Networks

Jun 2024 - Nov 2025

1 year 6 months

Hybrid

Security Operator

Pfeifer und Lange IT Solutions

Operational administration of a hybrid Palo Alto Networks firewall infrastructure (AWS and on premise) for an IoT network
Zoning of the internal network to secure network transitions/VLANs
Incident handling and implementation of changes
Standardization of the infrastructure across the entire environment (firewall)
Security operations for the NDR solution from Nozomi Networks
Support and monitoring for endpoint security from CrowdStrike
Communication with clients and vendors in an international environment
Analysis and management of security incidents
Technologies used: Palo Alto Networks, Panorama, Nozomi Networks, CrowdStrike

Apr 2023 - May 2023

2 months

Project Manager for Business Unit Infrastructure Renewal

Melitta

Implementation of an infrastructure renewal within a business unit (firewall)
Vendor management for service takeover
Scheduling and planning of deployment
Troubleshooting infrastructure issues on-site
Leading a team of 2 people
Technologies used: Cisco, Fortinet, FortiManager, FortiAnalyzer

Jan 2023 - Dec 2023

1 year

Project Lead Infrastructure Renewal of a Business Unit in Asia

Melitta

Implemented an infrastructure renewal (firewalls, switches, datacenter, WLAN, VPN)
Carried out a datacenter move to a new location
Rolled out WLAN as part of a standardization (global WLAN SSID)
Migrated IP networks
Coordinated scheduling and deployment planning
Managed a service provider and on-site staff for implementation
Managed project and documented activities
On-site work abroad (Japan)
Technologies used: Palo Alto Networks, Panorama, GlobalProtect, Cisco, VMware, FortiClient, FortiManager, FortiAnalyzer

Apr 2022 - Feb 2023

11 months

Project Lead Switch Migration

Melitta

Carried out a switch migration within a business unit
Coordinated service provider for service handover
Documented and prepared switch configurations for rollout
Technologies used: Enterasys Networks, Palo Alto Networks, Panorama, Cisco

Oct 2020 - Jun 2021

9 months

Bad Oeynhausen, Germany

Cyber Security Consultant

Herz- und Diabeteszentrum NRW

Implemented network segmentation to protect servers
Implemented security measures
Performed log analysis to restrict access
Technologies used: Palo Alto Networks, Panorama

Sep 2020 - May 2024

3 years 9 months

Internal IT Consultant for Network and Security

Melitta

Architected a global network infrastructure
Managed service providers to ensure and implement required security measures according to internal IT requirements
Standardized an international infrastructure (firewall, LAN, WLAN, VPN)
Delivered projects of various sizes in a global IT network environment
Communicated with clients and service providers in an international environment
Managed local infrastructure components for a business unit (firewall, LAN, WLAN)
Technologies used: Palo Alto Networks, Panorama, GlobalProtect, Enterasys Networks, Fortinet, Cisco, FortiClient, FortiManager, FortiAnalyzer

Oct 2019 - Aug 2020

11 months

Security Operations Team Member

DTS Systeme Herford

Supported operations in an IT system house
Handled change tickets in various client environments
Implemented security measures in client environments
Migrated client firewalls
Technologies used: Palo Alto Networks

Jul 2013 - Dec 2013

6 months

Bad Oeynhausen, Germany

Firewall Migration Project Lead

Herz- und Diabeteszentrum NRW

Project coordination for the migration from a Cisco ASA to a Palo Alto next-generation firewall
Implementation of a highly available firewall cluster
Definition of an updated ruleset for secure access
Management of service providers for the migration
Coordination of tasks and alignment with stakeholders
Security measure for implementing network segmentation
Applied technologies: Palo Alto Networks, GlobalProtect, Cisco ASA

Jun 2012 - Sep 2019

7 years 4 months

Bad Oeynhausen, Germany

Network Engineer / Network Administration

Herz- und Diabeteszentrum NRW

Architecture and design of a hospital network infrastructure
Expansion and updating of network components
Network management within a critical infrastructure
Support during audits (KRITIS)
Implementation of projects of various sizes in the network environment
Ensuring a highly available network environment (HA concepts, failure tests)
Applied technologies: Palo Alto Networks, Panorama, GlobalProtect, Extreme Networks (switch, Wi-Fi), Enterasys Networks (switch, Wi-Fi), Cisco ASA, Lancom, HP

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Healthcare, Food and Beverage, Information Technology, and Insurance.

Healthcare

Food and Beverage

Information Technology

Insurance

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Project Management, and Operations.

Information Technology

Project Management

Operations

Summary

Security - a word that can trigger very different emotions depending on experience. For me, it sparks a passion for protecting company networks. Let's work together to analyze the security of your network infrastructure and take it to the next level.

Skills

Security Operator
Network Security
Cyber Security
Firewall (Palo Alto)
Project Management
Friendly Demeanor
Reliability
Accuracy
Focused Work Style
Wlan
Lan
Switching
Vpn
Network Segmentation
Network Management
Network Access Control
Troubleshooting
Palo Alto Networks
Globalprotect
Panorama
Enterasys Networks
Enterasys Nac
Extreme Networks
Cisco
Lancom
Fortigate
Hp

Languages

German

Native

English

Advanced

Certifications & licenses

Enterasys Certified Specialist - Routing NMS

Enterasys Certified Specialist - Switching NMS

Statistics

Experience

Total positions 12

Experience in Healthcare 8 y

Avg length 1 y 5 m

Longest experience 7 y 3 m

Global Experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles Security Operator, Security Operator & Project Manager, Project Manager for Business Unit Infrastructure Renewal

Main industries Healthcare, Food and Beverage, Information Technology

Main business areas Information Technology, Project Management, Operations

Qualifications

Certifications earned 2

Profile

Created

May 2026

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Frequently asked questions

Have questions? Find more information here.

Where is Viktor based?

Viktor is based in Kalletal, Germany and can operate in on-site, hybrid, and remote work models.

What languages does Viktor speak?

Viktor speaks the following languages: German (Native), English (Advanced).

How many years of experience does Viktor have?

Viktor has at least 14 years of experience. During this time, Viktor has worked in at least 10 different roles and for 7 different companies. The average length of individual experience is 1 year and 2 months. Note that Viktor may not have shared all experience and actually has more experience.

What roles would Viktor be best suited for?

Based on recent experience, Viktor would be well-suited for roles such as: Security Operator, Security Operator & Project Manager, Project Manager for Business Unit Infrastructure Renewal.

What is Viktor's latest experience?

Viktor's most recent position is Security Operator at Pfeifer und Langen IT-Solutions GmbH.

What companies has Viktor worked for in recent years?

In recent years, Viktor has worked for Pfeifer und Langen IT-Solutions GmbH, VdS Schadensverhütung GmbH, QITS GmbH, Pfeifer und Lange IT Solutions, and Melitta.

Which industries is Viktor most experienced in?

Viktor is most experienced in industries like Healthcare, Food and Beverage, and Information Technology. Viktor also has some experience in Insurance.

Which business areas is Viktor most experienced in?

Viktor is most experienced in business areas like Information Technology, Project Management, and Operations.

Which industries has Viktor worked in recently?

Viktor has recently worked in industries like Food and Beverage, Information Technology, and Healthcare.

Which business areas has Viktor worked in recently?

Viktor has recently worked in business areas like Information Technology, Project Management, and Operations.

Does Viktor have any certificates?

Viktor has 2 certificates. These include: Enterasys Certified Specialist - Routing NMS and Enterasys Certified Specialist - Switching NMS.

What is the availability of Viktor?

Viktor will be available from June 2026.

What is the rate of Viktor?

Viktor's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.