DMZ Experts in Germany
matched in minutes from over 15,000 CVsHire experts who design segmented network zones, secure public-facing services and connect firewalls with identity controls. FRATCH matches you quickly and precisely with vetted, available freelancers for DMZ architecture, migration and operations.
Meet FRATCH Experts in Germany, who have recently used DMZ
Gerhard K.
Last position:
Senior Project Manager and Site Manager at HENSOLDT Optronics GmbH
- Set-up of the data center in Oberkochen (Defence division)
- Planning of the fiber-optic ring and simulation of Wi-Fi coverage
- Installation plan for WAN and LAN cables for office and production (infrastructure)
- Adaptation of the SAP system (R3) for the Oberkochen site (software)
- IT transformation of the SAP system to SAP HANA
- Planning of network infrastructure and server technologies in the SAP environment
- Pre-sales support and establishment of change management
- Independent coordination of utilities according to time, budget and quality
- Mapping of the project in MS Project and SERVICENow
- Development and design of hardware and software
- Demand management and portfolio management
- Set-up of a risk register and migration plan
- Preparation of payment-supporting documents in coordination with the responsible finance and commercial functions
- Budget: 5 million - 34 FTE
Tezcan D.
Last position:
Solution Architect / Project Manager at German Football Association
- Overall responsibility for the project lifecycle from scope definition to completion
- Close collaboration with platform teams, IT leaders, and external service providers
- Application of SAFe principles and structured sprint work
- Creation of a migration roadmap with clear milestones
- Monitoring of the lifecycle: onboarding, repository migration, replication of permissions, and system tests
- Visualization of the architecture with PlantUML and Gliffy as well as documentation in Confluence
- Regular status reports and running knowledge transfer sessions
Christian W.
Last position:
Software Engineer, cross-platform Application Manager at International major bank
- Creating interfaces between the legacy platform and the new container solution
- Coordinating required contributions from line units
- Moderating regular status meetings with the software vendor
- Minimally invasive conversion of TWS scheduling from the old to the new platform
- Environment: IBM Mainframe, DB2, CICS, MQ, Red Hat Linux, Oracle, Kubernetes, Kafka, Helm, GitLab, Jenkins
Stephan L.
Last position:
IT Generalist at SThree
- Software packaging and distribution with SCCM/MECM
- Application responsibility and support (50–100 applications)
- Documentation via ticket system
- User management via AD console
- Software updates and distribution
- Maintenance and updating of software packages
- Customizing scripts with PowerShell
- Rolling out and implementing new software
- Supporting IT security and compliance
Tools and software: Confluence, M365, Active Directory, Intune, Endpoint Management, SCCM/MECM, PowerShell, VMware Hardware: Lenovo, Cherry, Plantronics, Jabra + peripherals
Matthias S.
Last position:
Subproject Manager / Head of Monitoring at IT service provider (Berlin/Kolbermoor)
- Subproject Manager / Head of Monitoring for facility management and handling operational project parts as well as coordinating operations
- CheckMK consulting: central monitoring infrastructure with CheckMK master and distributed CheckMK satellites
- Implementation of advanced monitoring approaches, integration of new plugins and customization of the CheckMK agent
- Graphic representation of performance metrics with InfluxDB and Grafana, creation of NagVis/Grafana templates and dashboards
- Monitoring of Linux/UNIX/Windows systems and active components using CheckMK agents/MRPE as well as hardware monitoring via SNMP
- Development of monitoring plugins based on Bash scripting
- Inventory and cross-disciplinary analysis for application-specific monitoring
- Concept design, testing and documentation for integrating CheckMK status messages and performance data into a higher-level umbrella system (Data Leak)
- Technical and conceptual point of contact
Christian D.
Last position:
Managing Director and Senior Consultant at business-security (b-sec®) GmbH
- Conceptual consulting for securing business processes
- Consulting on planning and implementation of IT and IT security projects
- Security and policy checks, process optimizations, emergency planning
- Project management and interim management in IT infrastructure and information security
Overview of relevant projects:
- 2025: Consulting on a DLP concept for Digid GmbH.
- 2025: Consulting a client after a cybersecurity attack that compromised the IT infrastructure and where the attacker obtained M365 tenant admin rights. Investigated the IT infrastructure and restored it. Developed recommendations to improve IT security.
- 2025: Continued the projects listed below for Thyssenkrupp Marine Systems and Norddeutsche Landesbank.
- 2024: Created a DNS concept including advice on DNS strategy and technology, DNS design, DNS security, load balancing, reverse lookup zones, and automation. Created a DHCP concept including advice on DHCP design, a central DHCP management system and automation. Advised on operating the mentioned products, the operational processes, and updated IT documentation and IT service descriptions for Thyssenkrupp Marine Systems.
- 2024: As-is analysis and assessment of the network and security infrastructure established by providers in terms of overall architecture including design and components. Designed solution proposals to improve current operations for performance and security maximization as well as complexity reduction. Presented the results to C-level, their causes and possible solutions including required decision templates. Developed a SASE concept based on a zero-trust architecture for Norddeutsche Landesbank.
- 2024: Continued the projects listed below for Atlas GmbH and Deutsche Vermögensberatung AG.
- 2023: Consulting on resolving findings from an IT security assessment of the IT infrastructure, conducting proofs of concept for DDoS protection and digital experience monitoring (DEM) with Zscaler (ZIA, ZPA & ZDX), creating a new security architecture based on zero trust, redesigning a Cisco ISE implementation, and designing a DNS security solution to protect guests and financial advisors for Atlas GmbH / Deutsche Vermögensberatung AG.
- 2023: Continued the projects listed below for Digid GmbH, Vaillant Group GmbH (until 09/2023), Federal Institute for Geosciences and Natural Resources (until 05/2023), and Union Investment IT-Services GmbH (until 07/2023).
- 2022: Created and reviewed whitepapers for infrastructure and security architectures, and planned new network infrastructures for the German Aerospace Center.
- 2022: Developed a concept for the technical and procedural modernization of a disaster recovery plan for United Nations Volunteers.
- 2022: Developed a concept for migrating measurement data to a cloud environment, introduced network access control, and conducted an awareness training for Digid GmbH.
- 2022: Developed a network segmentation concept for DZ Hyp AG.
- 2022: Developed a network segmentation concept for the Federal Employment Agency.
- 2021: Developed a new load balancer architecture concept for Bundeswehr Fuhrparkservices GmbH.
- 2021: Conducted a vulnerability scan and penetration test of a web frontend including analysis and recommendations for remediation considering risk and likelihood for the client ifi GmbH.
- 2021: Consulting, design, and subproject management for implementing a network access control solution (certificate authentication and MAC address bypass) and macro segmentation (area and zone concept based on dynamic device assignment) in office and production IT for Vaillant Group GmbH.
- 2021: Upgraded and optimized LAN and WLAN infrastructure for United Nations Volunteers.
- 2021: Developed a target concept for modernizing the IT security infrastructure including the DMZ (Cisco switches, firewalls, WSA, ESA, SMA), internet connections, admin and management networks, and the wireless LAN, including overseeing implementation for the Federal Institute for Geosciences and Natural Resources.
- 2021: Created a micro-segmentation concept based on Cisco DNA, SGT, and zero trust for Union Investment IT-Services GmbH.
- 2021: Reviewed and updated ISMS level 3 policies and created procedure instructions for Software AG.
- 2021: Project lead for the global tech refresh project Meraki WLAN 2.0, coordinated the outsourcing of LAN/WLAN infrastructure to a managed service provider, and created a WLAN concept for automated guided vehicles for Heraeus Infosystems GmbH.
- 2021: Project management and technical support for the 'Transition of SIEM/SOC Services' project migrating a client to a shared environment, and took on the interim role of Head of Security Operations at Datagroup SE.
- 2021: Conducted a workshop for the future implementation of mobile device management for Allgeier Experts Go GmbH.
- 2021: Subproject management for implementing a firewall rule management tool and recertifying NAC endpoints based on 802.1x and MAB for Union Investment IT-Services GmbH.
- 2020: Developed a network segmentation concept for two data centers based on Cisco and VMware for Aareon AG.
- Recorded and analyzed the current network architecture including project initiation.
- Designed a micro-segmentation concept in the data center and access network.
- 2020: Infrastructure and security architecture audit for Stuttgarter Versicherung AG.
- Analyzed the IT infrastructure and security architecture regarding network and security component configurations. Also reviewed contracts, process documents, and manuals for completeness. Developed recommendations to improve the stability and operation of the infrastructure. Created a network segmentation concept and led the project to implement the measures from the audit.
- 2020: Consulting on setting up an ISMS-light for Josera foodforplanet GmbH & Co. KG.
- 2020: Security architecture consulting for Datagroup SE.
- Developed a future IT infrastructure and IT security architecture.
- Documented the current IT architecture of all 23 entities.
- Made recommendations to optimize the IT infrastructure and drafted a comparison of a traditional perimeter security concept versus a zero trust model.
- Created a security zone concept.
- Designed an IT infrastructure architecture in coordination with all entities.
- 2018 - 2019: Stream lead in the cybersecurity program at Deutsche Lufthansa AG.
- Responsible for designing and implementing 9 projects in IT security infrastructure and user access management, as well as managing project managers and experts.
- Project area: Network segmentation and access control.
- Project area: Security architecture.
- Project area: Privileged, identity & access management.
- Project area: Simplify user authentication (MFA).
- Project area: Mobile & endpoint security.
- Project area: OT security.
- Project area: E-enabled aircraft.
- 2018: Security architecture consulting for Deutsche Lufthansa AG.
- Project management for the development, evaluation, and management of the company-wide information security architecture.
- Developed a security strategy and a roadmap to align the security architecture with the zero trust model.
- Evaluated market security solutions, services, and tools.
- Defined requirements for RFPs and assessed proposals.
- Developed, maintained, and monitored security architecture artifacts.
- Conducted security assessments of existing and new IT systems and security services.
- 2018: ISMS consulting for GLS IT Services GmbH.
- Advised on implementing and initially operating an ISMS based on ISO27001.
- Audited the IT environments of GLS country subsidiaries.
- Analyzed and assessed IT security risks and derived necessary measures.
- Developed solution proposals in coordination with relevant stakeholders.
- Managed the project and handed over the ISMS to operations.
- 2016 - 2018: Security pre-sales consultant for Cisco Systems GmbH.
- Provided nationwide strategic and conceptual consulting to major enterprise and financial and insurance clients on Cisco and Meraki security products and services such as Firepower, WSA, ESA, Stealthwatch, and ISE.
- 2017 - 2018: Designed and implemented an ISMS for Verivox GmbH.
- Conducted various BIAs and gap analyses.
- Developed security policies based on ISO 2700x.
- Served as interim information security officer.
- 2017: Developed an emergency concept for VPV Lebensversicherungs-AG.
- Reviewed and updated the IT emergency manual.
- 2016: Consulting and project management for designing cloud & hosting services for Vodafone Group Services GmbH.
- Analyzed and optimized the sell-build-run process.
- Created detailed level designs for cloud products.
Benno Z.
Last position:
Freelance Data Protection Officer at SUMTEC
- Drafting the data protection concept under EU GDPR including DPIA and implementing TOMs
Marcus W.
Last position:
Administrator, DevOps at KZVB
- Planned and implemented new network infrastructure (VLAN, LACP, DMZ, structured cabling)
- Migrated from VMware to KVM using Oracle Linux Virtualization Manager (OLVM), including CPU pinning
- Hardened the entire environment using SELinux (KVM hosts, container hosts, database servers)
- Configured and operated the virtualization platform with OLVM and Ansible-based provisioning
- Containerized and redeployed critical services: WordPress, Jenkins, PostgreSQL, MariaDB, Subversion with Apache + AD integration
- Developed Ansible playbooks for automated deployment and configuration management
- Integrated Foreman for repository and security management in the DMZ
- Produced technical documentation in Markdown; organized in Bookstack
- Coordinated with external vendors (e.g. HPE) for hardware installation and setup
- Delivered all contributions documented and reproducible in Markdown
Peter V.
Last position:
Cross Project Excellence at Energy provider
- Overarching technical coaching and support for project managers during the migration of regional companies into the group's O365 infrastructure (Azure).
- Creation and use of content, technical, and methodological synergies between the individual subprojects.
- Project duration: 9 months.
Stefan F.
Last position:
Project Management – Telecommunications at 1&1 Versatel
- Set of concurrent projects (BSS/OSS related)
Discover over 15,000 top freelancers
Statistics of experts using DMZ
Aggregated from the professional profiles of matched freelancers.
Experience
30 years
Position duration
2.5 years
Positions per freelancer
18
Top business areas
Information Technology, Operations, Project Management
Top industries
Information Technology, Banking and Finance, Telecommunication
Certification focus areas
Information Technology, Human Resources, Project Management
Bachelor's degree or higher
100%
Master's degree or higher
50%
Doctorate
33%
Certifications per freelancer
7
Most common languages
German, English, French
Speak two or more languages
100%
Based on our profile pool as of 19 Sep 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Germany are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows how many freelancers charge within that range.
Average rates of experts in Germany using DMZ
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 19 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
DMZ experts industry focus
See which industries our matched freelancers work in most often — every figure is calculated live from the freelancers on FRATCH.
- Information Technology (100%)
- Banking and Finance (70%)
- Telecommunication (70%)
- Energy (50%)
- Transportation (50%)
- Aerospace and Defense (40%)
- Insurance (40%)
- Retail (40%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Network boundary
A DMZ, or demilitarized zone, is a network segment placed between an untrusted network such as the internet and a protected internal network. It hosts services that must be reachable from outside while limiting direct access to internal systems. Firewalls, routing rules and strict traffic policies control each connection.
Common workloads
Companies use DMZ architecture for public services and controlled partner access:
- Hosting web servers, reverse proxies and API gateways
- Isolating mail relays, DNS services and remote access gateways
- Protecting external file transfer and partner integrations
- Separating test, staging and production entry points
The exact layout depends on application flows, data sensitivity and operational requirements.
Security design
Strong DMZ work starts with clear trust boundaries and a documented traffic matrix. Specialists define which connections are allowed, which are denied and how each flow is logged. They also apply secure administration paths, patching routines, intrusion monitoring and resilient firewall policies.
Modern designs may use a single perimeter firewall, dual-firewall separation or cloud-native network controls. The goal is not simply to place systems in another subnet, but to limit the impact of a compromised public service.
Ecosystem and tooling
DMZ projects often span next-generation firewalls, load balancers, reverse proxies, VPN gateways and web application firewalls. They may also involve VLANs, routing, network access control, SIEM integration, vulnerability scanning and infrastructure-as-code.
Professionals need to understand TCP/IP, DNS, TLS, HTTP, authentication and certificate management. Cloud environments add virtual networks, security groups, private endpoints and controlled ingress services to the design.
When expertise matters
Companies bring in freelance specialists when an existing perimeter no longer fits new applications, cloud connectivity or compliance requirements. Typical assignments include:
- Reviewing firewall rules and undocumented network paths
- Moving public services into a segmented architecture
- Connecting on-premises DMZs with cloud environments
- Testing failover, monitoring and incident response procedures
In Germany, remote collaboration is often practical for design and documentation, while hardware changes and site cutovers may require on-site work. German or English communication should be agreed early.
Signs of quality
A capable DMZ professional explains security decisions in terms of business flows, exposure and operational risk. They produce current diagrams, rule documentation, change plans and test evidence rather than relying on informal knowledge. They also distinguish network segmentation from application security and involve system, identity and incident-response teams where needed.
Ask candidates to describe a comparable boundary design, how they handled exceptions and how they validated that only intended traffic could pass. Quality shows in a design that remains understandable, observable and maintainable after handover.
Frequently asked questions
Curious about DMZ? Here are the answers that come up again and again.
A DMZ separates public-facing services from an organisation’s internal network. It is commonly used for web servers, mail relays, reverse proxies, VPN gateways and partner integrations that need controlled external access.
A demilitarized zone provides defined trust boundaries, while a flat network allows systems to share a much broader security area. Segmentation can limit lateral movement after a public service or endpoint is compromised, provided firewall rules and monitoring are maintained.
A strong DMZ specialist usually understands firewalls, routing, VLANs, DNS, TLS, VPNs and reverse proxies. Cloud networking, identity controls, SIEM integration, vulnerability management and incident response are also valuable for modern environments.
A DMZ project needs experience that matches its scope and risk, not a fixed time in the field. A simple rule review may suit one specialist, while a redesign spanning data centres, cloud networks, public applications and failover needs a professional who has led comparable transitions.
A DMZ engagement can often be handled remotely for discovery, architecture, rule analysis, documentation and testing. On-site collaboration may still be needed for physical firewall changes, cabling, maintenance windows or environments with strict access controls; language and working hours should be agreed at the start.
Good DMZ work includes clear network diagrams, a justified traffic matrix, documented exceptions, logging requirements and tested rollback steps. Ask how the professional validates allowed flows, reviews unnecessary exposure and keeps the design accurate after handover.
A DMZ remains relevant, but its controls may be implemented with cloud virtual networks, security groups, load balancers, private endpoints and managed ingress services. The same principle applies: public entry points should have tightly controlled paths to protected workloads and data.
A demilitarized zone engagement should produce an architecture diagram, current-state assessment, firewall and routing rule documentation, security assumptions and a migration or change plan. Strong deliverables also cover monitoring, testing, ownership and operational procedures for future changes.
The average hourly rate of freelancers in Germany who have used DMZ in their recent projects is 116 €, which corresponds to a daily rate of about 932 € based on an 8-hour working day.
Of the freelancers in Germany who have used DMZ in their recent projects, 100% hold at least a Bachelor's degree, 50% hold at least a Master's degree, and 33% hold a doctorate.
On average, freelancers in Germany who have used DMZ in their recent projects have 30 years of professional experience, with a single engagement typically lasting around 2.5 years.
The most common languages among freelancers in Germany who have used DMZ in their recent projects are German (100%), English (100%), and French (30%).
The most common industries among freelancers in Germany who have used DMZ in their recent projects are Information Technology (100%), Banking and Finance (70%), and Telecommunication (70%).
The most common business areas among freelancers in Germany who have used DMZ in their recent projects are Information Technology (100%), Operations (100%), and Project Management (100%).
Main locations of FRATCH Experts, who have recently used DMZ
Our freelancers and interim experts are at home across the DACH region — available on-site in the major business hubs or fully remote. Choose a location to discover matched specialists, local market insights and up-to-date availability.
Berlin Hamburg Munich Cologne Frankfurt Stuttgart Dusseldorf Leipzig Dortmund Essen Bremen Dresden Hanover Nuremberg Request a free demo
Get in touch with the FRATCH team and we will get back to you within 4 hours.
Would you rather directly get in touch?
We always have the time for a call or email!
Philipp Thomaschewski
FRATCH CEO
