Christian Enderle - IT Infrastructure & Security Consultant

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Stadtallendorf, Germany

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Experience

Jun 2022 - Apr 2024

1 year 11 months

IT Consulting / IT Rebuild

IT Rebuild (PF)

Analysis of requirements and the current situation
Migration of an old domain structure and Tobit to Exchange 2019 with connection to MS365
Review of implementation options and planning for the protection of sensitive data
Planning with regard to BSI Grundschutz, BDSG, and DSGVO
IT governance and IT security backtests
Support with ERP setup and securing mail transfer
Hyper-V 2016/2022, Microsoft Terminal Services Cluster, Microsoft Exchange 2019
Office 365, Microsoft 365, Azure AD, Teams, Salesforce
Cisco, Zyxel, and HP switches, Sophos firewalls/UTMs, SecurePoint
Microsoft IIS 2022, IPv4/IPv6, Veeam, Wortmann Online Backup, NextCloud
Services: DNS, DHCP, TCP/IP, subnetting, firewalling, routing, VoIP, group policies (GPO), SIEM, remote work, home office, high availability, failover, VLAN, PRTG

May 2022 - Apr 2023

1 year

2nd / 3rd Level Linux System Engineer / Consultant

IT/Linux Environment Support (SIE)

Migration of native installations to virtual environments
Consulting and support for HA implementations and IT security (VPN/WLAN)
Testing procedures for evaluation and authentication consulting
Analytical identification of problem causes (repair vs. rebuild)
Assessment of future viability and support for the teams involved
Windows VDI, Proxmox Virtual Environment 7.x, pfSense Firewall
VPN: IPSec with SmartCard Auth, WireGuard, LoadBalancing
Office 365/Teams analysis under Linux, Citrix VDI, NetScaler
Azure/MS365 connection to Linux, Debian OS, Ubuntu, VMware, SIEM, 2FA, GitLab, Ansible, Kubernetes

Apr 2021 - Jun 2022

1 year 3 months

2nd / 3rd Level Microsoft System Engineer / Consultant

Multinational Environment (ZE)

Analysis and rebuild of terminal servers in a multi-hierarchical environment for 45,000 employees globally
Troubleshooting of local and global incidents and escalation management
User training in the responsive handling of systems and errors
Development of a Proof of Concept as a technical benchmark
Windows Terminal Services / Remote Desktop Services (2008 to 2022), VMware ESXI, VMware vCenter
NetApp Storage, TrueNAS/FreeNAS, Microsoft cluster functions, SQL Server
LoadBalancing, Office 365, Teams, hybrid setup, mail encryption
Citrix VDI, NetScaler, Symantec AV, Azure/AWS, FSLogix, 2FA, SIEM
System monitoring with Prometheus/Grafana and Zabbix
Services: VDI, Active Directory, LDAP, Doors, Integrity, BCM, group policies, Remedy

Feb 2021 - Mar 2021

2 months

IT Security Consultant

Hafnium Hack Incident Handling

Crisis management due to global attacks on Exchange Servers at new clients from the SME, medical, and municipal sectors
Investigation of the hack, analysis of the approach, and isolation of infected systems
Assessment of attack vectors and checks for web shells
Communication with management to assess risks from a systems security and DSGVO perspective
System hardening and implementation of security measures
Coordination with security departments of large corporations such as Siemens and Arvato Systems
Exchange 2013-2019, Office 365, Active Directory, LDAP, Sophos UTM, Fortigate, LanCom, SecurePoint

Dec 2020 - Apr 2024

3 years 5 months

IT Architecture Project Manager

ASP Structure Development

Analysis of requirements and the current situation
Review of implementation options and planning of the approach
Preparation for protecting sensitive data in accordance with BSI Grundschutz, BDSG, and DSGVO
Technical project management and development of a system monitoring infrastructure
IT governance planning and IT security backtests
Implementation of load balancing and high availability
Hyper-V 2016/2022, Microsoft Terminal Services Cluster, VMware, Proxmox PVE, Proxmox Backup Server
Citrix, Microsoft Exchange 2019, Windows, Office 365, Microsoft 365, Azure AD
Cisco, Zyxel, and HP switches, Kubernetes, Sophos firewalls/UTMs
Debian Linux, NextCloud, SeaFile, Microsoft IIS 2022, Nginx, MariaDB, MySQL, Varnish
IPv4 / IPv6 networking, Zammad, Elasticsearch, Veeam
Services: DNS, DHCP, TCP/IP, subnetting, firewalling, routing, VoIP, Check_mk, PHP, SIEM, remote work, home office, failover, VLAN

Nov 2020 - Apr 2021

6 months

Managing System Engineer

Municipality (GS)

Analysis of requirements and the current situation for 150 employees
Planning a smooth upgrade path from Exchange 2010 to Exchange 2019
Support in securing sensitive data and troubleshooting previous configurations
Consulting regarding BSI Basic Protection, BDSG and GDPR
Cleanup of legacy IT issues and technical project management
Hyper-V 2016/2019, VMware, Windows, Exchange 2010/2013/2019
Cisco Switches, Fortigate Firewalls, Mail Archiving, Proxy, Mail Encryption, Veeam Backup

Jan 2020 - Apr 2020

4 months

Network Rebuild / IT Consultant

Medical Network (MLOS)

Analysis of requirements and preparation of a rough concept for network routing and segmentation
Roll-out of the network structure according to the target definition at various locations
Troubleshooting of an unsuccessful 1.5-year telecommunications roll-out project within 1.5 months
Consulting on special medical requirements, BSI Basic Protection and GDPR
Planning a High-Availability Network Infrastructure for the datacenter
Network troubleshooting, VLAN, pfSense, FreeNAS, Proxmox virtualization
Debian, Ubuntu Linux, SIEM, Cisco, Ruckus Switches, 3cx telephone system

Nov 2019 - Dec 2020

1 year 2 months

IT Restructurer / Renovator

Specialized Electronics (HS)

Assessment of the current situation and troubleshooting of an unstable IT structure for 150 employees
Development and implementation of a new IT structure based on AD2019 and Exchange 2019
Definition of groups and IT security, network separation and introduction of patch management/VLANs
Setup of Sage, Datev and industry-specific software
HPE / IBM Servers, Sophos SG Firewall, Microsoft AD 2016/2019, Microsoft Exchange 2016/2019
VMware Hypervisor ESXi 5.5/6.x/7.x
Services: DNS, DHCP, TCP/IP, Subnetting, Firewalling, Routing, IT Security Analysis, IT Architecture

Oct 2019 - Jul 2020

10 months

IT Restructurer after Ransomware Attack

Security Service (WS)

Crisis management and containment of IT traffic to prevent the spread of ransomware
Restructuring of the IT infrastructure and consulting for company management for 1,250 employees
Implementation of a firewall with IDS/IPS and mail scanning functionality
Reinstallation of the server infrastructure and implementation of separated networks (Hardening)
Development of an access rights concept and setup of Sage, Datev and industry software
White-Hat Hacking for source analysis and damage assessment
Dell / IBM Servers, Sophos SG Firewall, Windows Server 2019, Microsoft AD 2019
Microsoft Exchange 2019, O365 migration, Hybrid setup, Azure, AWS
Hyper-V 2019, Microsoft Terminal Services, VMware HyperVisor 6.x/7.x
Services: DNS, DHCP, TCP/IP, Subnetting, Firewalling, Routing, SIEM

Sep 2018 - Oct 2023

5 years 2 months

IT Consulting / IT Development

Management Developer (RY)

IT and IT security management role as System Engineer
Remediation of deficiencies in processes and potentially critical GDPR attack surfaces
Development of internal IT by combining on-premise and cloud solutions
Integration of CRM resources and development of work-everywhere concepts
Setup of a central data repository and securing the company network
Training and consulting on IT matters
Dell Servers, Dell Clients, Sophos SG, Cisco Firewall and Switches
Windows, Microsoft AD 2019, Eset Antivirus, Microsoft Exchange 2019, O365, Microsoft 365, Teams
Microsoft IIS 2019, Microsoft Hyper-V 2019, VMware, Veeam, LoadBalancing
Services: DNS, DHCP, TCP/IP, Subnetting, Firewalling, Routing, VoIP, SIEM, Remote Work, Linux, Debian, Ubuntu, PHP, MySQL, MariaDB, NextCloud

Jul 2018 - May 2020

1 year 11 months

System Recovery and Restoration

Retail (SD)

Took over and repaired an outdated, insecure website and webshop setup running on Docker
Analyzed system interdependencies and created documentation
Extracted the data and reimplemented it on current operating system and module versions
Ongoing system maintenance
Ubuntu, Debian Linux, Apache, Nginx, Git, PHP, MySQL, MariaDB, Docker
WordPress, Odoo, E-Commerce integrations, FOSS software

Jun 2018 - Apr 2024

5 years 11 months

Internal IT Support / IT Consulting

Special Machinery Manufacturing (RM)

Managing System Engineer for network security issues, consulting and support
Planned and implemented VLAN structures and routing
Implemented a firewall solution and system hardening
Appointed as the sole external IT provider and assumed an IT security management role
Built a new server infrastructure based on Windows Server 2016
Established security policies according to BSI Basic Protection and provided GDPR consulting
Cloud remigration of services such as mailing from O365/Azure to Exchange 2019
Supported the securing of special-purpose machinery
Project management, management of external service providers and sourcing
Dell Server, Dell Clients, Sophos SG, HPE, Ruckus Networking, Cisco Firewall and Switches
Microsoft AD 2008R2/2019, Microsoft Exchange 2010/2019, email archiving, email encryption
NextCloud, Datev, Microsoft IIS 2019, Microsoft Terminal-Services Cluster
VMware Hyper-Visor 6.x/7.x, Veeam, Microsoft SQL Server, DBA, Debian, Ubuntu
Services: DNS, DHCP, TCP/IP, subnetting, firewalling, routing, VoIP, Linux, PHP, MariaDB, MySQL, JQuery, SIEM, VLAN, WLAN network segmentation, SDSL, fiber optic

Dec 2015 - Apr 2024

8 years 5 months

External IT Management / IT Architect

Food Sector (P)

Took over internal IT administration and worked as a shared CIO / CISO
Built a complete IT infrastructure for 20 people within four working days
Implemented terminal server functions and an IT security policy
Implemented separate network segments and VLANs across two locations
Integrated a promotional guest network separated from the internal network
Planning based on BDSG, GDPR and BSI Basic Protection
Standardized the security infrastructure and performed system hardening
Dell Server, Dell Clients, Sophos SG Firewall, HPE Switches, Microsoft AD 2012R2
Microsoft Exchange 2016, Microsoft 365, Teams, email archiving, email encryption
Hyper-V, Microsoft IIS, SQL Server, Sage DMS, ERP, SuccessFactors
Microsoft Terminal-Services Cluster, Debian Linux, Ubuntu, VoIP-TK, Zammad, Elasticsearch
Backup: Veeam, system monitoring with Check_mk, SIEM, PHP, MariaDB, JQuery

May 2015 - Apr 2024

9 years

CEO / CIO / CISO

Web Hosting / Application Service Provider / Managed Services

Took over all internal IT administration
Assessed the current situation and developed the target definition
Implemented the central server infrastructure, including procurement
Used multi-level intrusion prevention methods, achieving A/A++ ratings
Interface management and sourcing
Objectives and planning based on BDSG, GDPR and BSI Basic Protection
Dell Server, Dell Clients, Sophos SG, HPE, Cisco Firewall and Switches
Microsoft AD 2016-2022, Microsoft Hyper-V 2012R2-2022, Exchange Server 2013-2019
Office 365, Microsoft 365, Teams, ToDo, Lists, SharePoint, email archiving
Debian Linux, Ubuntu Linux, Lync-Server, Skype-Server, Zammad, Elasticsearch, FreeNAS
Azure, AWS, Veeam, Urbackup, NextCloud, SeaFile, Microsoft Terminal-Services
System monitoring based on the Check_mk stack, Postfix, Apache2, Nginx, PHP
Services: DNS, DHCP, TCP/IP, subnetting, firewalling, routing, VoIP, SIEM, VLAN, WLAN, network segmentation

Sep 2013 - Aug 2017

4 years

External IT Management / IT Architect

Media Industry / VA (MAH)

Assessed the current situation and troubleshot an unstable IT structure
Developed a new IT structure and managed technical projects
Managed interfaces and organized various technical projects
Conducted employee training and held budget responsibility
Used multi-level intrusion prevention methods (digital and physical)
Dell Server, Dell Clients, Sophos SG Firewall, HPE Switches, FreeNAS, Eset AV
Microsoft AD 2012R2, Microsoft Exchange 2013, Microsoft Hyper-V 2012R2, Debian, Ubuntu
Services: DNS, DHCP, TCP/IP, subnetting, firewalling, routing, IT security analysis

Sep 2013 - Nov 2013

3 months

IT Restructurer / Renovator

High-end gastronomy and hospitality (B)

Assessment of the current situation and development of a target definition
Troubleshooting and resolution of an inefficient IT structure
Development of a new IT structure including interface functionality
Conducting employee training and budget responsibility
Implementation of multi-level methods for break-in prevention
HPE / IBM / Dell servers, Dell clients, Sophos SG firewall
Microsoft AD 2003/2008, Microsoft Terminal Services Cluster, load balancing
Microsoft Exchange 2013, email archiving, email encryption, Veeam Backup
Services: DNS, DHCP, TCP/IP, subnetting, firewalling, routing, IT security analysis

Oct 2012 - Apr 2024

11 years 7 months

External IT Manager / IT Architect

Hospitality (KS)

Full takeover of internal IT management as CIO, CISO and System Engineer (2nd / 3rd Level)
Consulting and support via a ticket system
Assessment of the current situation and development of a target definition
Implementation of the central server infrastructure, including procurement
Implementation of remote access options and an IT security policy
System hardening and implementation of a new IT structure with separate network sections/VLANs
Separation of the guest network from internal networks
Replacement of the previous communication between properties with high-performance wireless point-to-point technology
Interface functionality and sourcing
Planning based on BDSG, DSGVO and BSI basic protection
Dell servers, Dell clients, Sophos SG, HPE, Cisco firewalls and switches
Microsoft AD 2008R2/2019, Microsoft Exchange 2010/2019, Microsoft Hyper-V 2008-2019
Microsoft IIS 2010-2019, Debian Linux, FOSS evaluation, system monitoring (Check mk)
Backup: Urbackup, Veeam, MariaDB, MySQL, InfluxDB, PHP, JQuery
Services: DNS, DHCP, TCP/IP, subnetting, firewalling, routing, VoIP, SIEM, WLAN, network segmentation

Aug 2010 - Apr 2024

13 years 9 months

External IT Manager / IT Architect

SME (MN)

Full takeover of internal IT management with interface functionality, consulting and support
Assessment of the current situation and development of a target definition
Analysis, creation and implementation of the IT security policy
System hardening and implementation of a new IT structure with separate network sections and VLANs
Separation of the machinery network from the management and employee networks
Use of current, multi-level methods for break-in prevention
Successful defense against malware attacks via USB sticks without negative implications for the company network
Project management and rescue of a programming project that was at risk of failing
HPE / Dell servers, HPE / Dell clients, Sophos SG, HPE, Cisco firewalls and switches
Microsoft AD 2003/2008R2/2019, Microsoft Exchange 2010/2019, email archiving
Microsoft IIS 2010-2019, Microsoft SQL Server, DBA, database management
Microsoft Hyper-V 2008-2022, Debian Linux (V6 to current), Urbackup, Veeam
Rollout of Kaspersky and replacement with Eset Antivirus (client/server), VoIP PBX
Services: DNS, DHCP, TCP/IP, subnetting, firewalling, routing, NextCloud, SIEM, VLAN, WLAN, network segmentation

Industry experience

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

Experienced in Information Technology, Tourism, Food and Beverage, Manufacturing, Media and Entertainment, and Retail.

Information Technology

Tourism

Food and Beverage

Manufacturing

Media and Entertainment

Retail

Business area experience

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

Experienced in Information Technology, Project Management, Operations, and Procurement.

Information Technology

Project Management

Operations

Procurement

Summary

First of all, I would like to thank you for taking the time to review my CV.

You are looking for someone:

with well over ten years of practical experience in the depth and breadth of IT implementation, combined with entrepreneurship? ( - privately, roughly twice as much)
with planning, consulting, and implementation experience, working across industries while still taking industry-specific elements into account
with practical knowledge of data protection and security, licensing, and legal matters. Someone who can and wants to contribute this knowledge when assessing your environment? (no legal advice!)
familiar with consulting, planning, and implementation involving Microsoft, SaaS, closed source, and open source.
who brings practical know-how in dealing with employees, peers, and IT and company stakeholders? Leading and supporting. Internal execution, external execution. Internal leadership, external leadership, external consulting.
with experience in SMEs, across industries, with a direct employee scope of: 5-1.00, and an indirect scope (partial area) of up to approx. 45,000
who wants to use their own enthusiasm to implement projects in a way that benefits everyone involved in the long term?

If this is the case, you do not need to look any further. - As you can see from my CV below, I am happy to contribute these broad skills to short-term or, preferably, long-term projects.

I look forward to discussing how I can contribute my skills to your company’s benefit.

I will definitely get in touch with you and look forward to the upcoming project and the productive cooperation.

Best regards,

Christian Enderle

Skills

In-Depth And Broad Knowledge Of Tcp/Ip, Telecommunications/Tk, Networking, Firewalling, Open-Source Software (Various), Industry Software (Various), Sql, And Broad Knowledge Of Virtualization And Concepts.
Broad Range Of Hardware, Security Equipment And Firewall/Utm Manufacturers, Antivirus Software, Troubleshooting (2nd, 3rd Level…).
Technical: Shop Systems, Learning Tools (E-Learning), Crm, Cms,…
Analytical (Other) Skills: Go-To-Market Analysis, Marketing Approaches, Intercultural Communication.
Social Skills: Presentations (De/En) Tailored To The Audience, Employee, Team, And Project Management, Conflict Resolution (Technical/Social), Mediation, Bringing Stakeholder Groups Together.

Languages

German

Native

English

Advanced

Education

Oct 2020 - Present

unknown

Business Law

Oct 2012 - Jul 2018

Hochschule Ulm/Neu-Ulm

Bachelor of Science · Business Informatics · Neu-Ulm, Germany

Oct 2010 - Jun 2013

Evening Grammar School

General Abitur

...and 1 more

Certifications & licenses

Projekt- und Teammanagement Professional

PMC-Sattler

Statistics

Experience

Total positions 18

Experience in Information Technology 13.5 y

Avg length 3 y 10 m

Longest experience 13 y 8 m

Expertise

Recent roles IT Consulting / IT Rebuild, 2nd / 3rd Level Linux System Engineer / Consultant, 2nd / 3rd Level Microsoft System Engineer / Consultant

Main industries Information Technology, Tourism, Food and Beverage

Main business areas Information Technology, Project Management, Operations

Qualifications

Highest degree Bachelor

Certifications earned 2

Profile

Member since

April 2025

Last update

October 2026

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Frequently asked questions

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

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

Christian has at least 14 years of experience. During this time, Christian has worked in at least 15 different roles and for 18 different companies. The average length of individual experience is 1 year and 9 months. Note that Christian may not have shared all experience and actually has more experience.

Based on recent experience, Christian would be well-suited for roles such as: IT Consulting / IT Rebuild, 2nd / 3rd Level Linux System Engineer / Consultant, 2nd / 3rd Level Microsoft System Engineer / Consultant.

Christian's most recent position is IT Consulting / IT Rebuild at IT Rebuild (PF).

In recent years, Christian has worked for IT Rebuild (PF), IT/Linux Environment Support (SIE), Multinational Environment (ZE), ASP Structure Development, and Management Developer (RY).

Christian is most experienced in industries like Information Technology, Tourism, and Food and Beverage. Christian also has some experience in Manufacturing, Media and Entertainment, and Retail.

Christian is most experienced in business areas like Information Technology, Project Management, and Operations. Christian also has some experience in Procurement.

Christian has recently worked in industries like Information Technology, Tourism, and Food and Beverage.

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

Christian holds a Bachelor in Business Informatics from Hochschule Ulm/Neu-Ulm.

Christian has 2 certificates. These include: Projekt- und Teammanagement Professional and IT-Service Management ITIL3 Foundation.

Christian will be available full-time from December 2026.

Daily rate distribution

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<€720 €800-880 €880-960 €960-1040 €1040+

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Average rates for similar positions

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Daily rate avg. 865 €

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Median rate 820 €

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 16 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.