Christian Enderle - IT Consulting / IT Rebuild

Q: Where is Christian based?

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

Q: What languages does Christian speak?

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

Q: How many years of experience does Christian have?

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.

Q: What is Christian's latest experience?

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

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

In recent years, Christian has worked for IT-Neuaufbau (PF) , Unterstützung IT/Linux Landschaft (SIE) , Multinationales Umfeld (ZE) , Aufbau ASP-Struktur , and Management Developer (RY) .

Q: Which industries is Christian most experienced in?

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 .

Q: Which business areas is Christian most experienced in?

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

Q: Which industries has Christian worked in recently?

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

Q: Which business areas has Christian worked in recently?

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

Recommended expert

Stadtallendorf, Germany

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Experience

Jun 2022 - Apr 2024

1 year 11 months

IT Consulting / IT Rebuild

IT-Neuaufbau (PF)

Analysis of requirements and the current situation
Migration of an old domain structure and Tobit to Exchange 2019 with integration to MS365
Evaluation of implementation paths and planning for securing sensitive data
Planning regarding BSI basic protection, the German Federal Data Protection Act (BDSG), and GDPR
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 Policy (GPO), SIEM, remote work, home office, high availability, failover, VLAN, PRTG

May 2022 - Apr 2023

1 year

2nd / 3rd Level Linux System Engineer / Consultant

Unterstützung IT/Linux Landschaft (SIE)

Migrating native installations to virtual environments
Consulting and support for HA implementations and IT security (VPN/WLAN)
Test procedures for evaluation and authentication consulting
Analytical identification of problem causes (repair vs. rebuild)
Assessment of future viability and support for the involved teams
Windows VDI, Proxmox Virtual Environment 7.x, pfSense firewall
VPN: IPSec with smart card authentication, WireGuard, load balancing
Office 365/Teams analysis on Linux, Citrix VDI, NetScaler
Azure/MS365 integration with 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

Multinationales Umfeld (ZE)

Analysis and rebuilding of terminal servers in a multi-hierarchical environment for 45,000 employees globally
Troubleshooting local and global incidents as well as escalation management
User training for responsive handling of systems and errors
Building 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 clustering features, SQL Server
Load balancing, 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 Policy, Remedy

Feb 2021 - Mar 2021

2 months

IT security consultant

Incidenthandling Hafnium Hack

Crisis management due to global attacks on Exchange servers at new clients in SMEs, healthcare, and municipalities
Investigation of the hack, analysis of the approach, and isolation of infected systems
Assessment of attack vectors and checking for web shells
Correspondence with management to assess risks from a systems security and GDPR perspective
System hardening and implementation of security measures
Interaction with security departments of large corporations like 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 lead

Aufbau ASP-Struktur

Analysis of requirements and the current situation
Evaluation of implementation options and planning of the approach
Preparation for securing sensitive data according to BSI basic protection, the German Federal Data Protection Act (BDSG), and GDPR
Technical project management and setup 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)

Analyzing requirements and the current situation for 150 employees
Planning a disruption-free upgrade path from Exchange 2010 to Exchange 2019
Helping secure sensitive data and troubleshoot previous configurations
Advising on BSI basic protection, BDSG and GDPR
Cleaning up IT legacy issues and technical project management
Hyper-V 2016/2019, VMware, Windows, Exchange 2010/2013/2019
Cisco switches, Fortigate firewalls, email archiving, proxy, email encryption, Veeam Backup

Jan 2020 - Apr 2020

4 months

Network rebuild / IT Consultant

Medical Network (MLOS)

Analyzing requirements and creating a high-level concept for network routing and segmentation
Rolling out the network structure according to the target definition at various locations
Troubleshooting a failed 1.5-year telecom roll-out project within 1.5 months
Advising on medical-specific requirements, BSI basic protection and GDPR
Planning a high-availability network infrastructure for the data center
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

Special Electronics (HS)

Documenting the current situation and troubleshooting an unstable IT structure for 150 employees
Developing and implementing a new IT structure with AD2019 and Exchange 2019
Defining groups and IT security, network separation and introducing patch management/VLANs
Setting up Sage, Datev and industry-specific software
HPE / IBM servers, Sophos SG firewall, Microsoft AD 2016/2019, Microsoft Exchange 2016/2019
VMware ESXi Hypervisor 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 blocking IT traffic to prevent ransomware spread
Rebuilding the IT structure and advising company management for 1,250 employees
Implementing a firewall with IDS/IPS and email scanning functionality
Reinstalling the server infrastructure and implementing separated networks (hardening)
Developing an access rights concept and setting up Sage, Datev and industry-specific 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)

Leading IT and IT security as a System Engineer
Resolving workflow issues and potentially critical GDPR vulnerabilities
Developing internal IT by combining on-premise and cloud solutions
Integrating CRM resources and developing work-everywhere concepts
Setting up a central data repository and securing the corporate network
Training and consulting on IT topics
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, load balancing
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 Rescue and Restoration

Retail (SD)

Acquisition and overhaul of an outdated, insecure website and webshop setup under Docker
Analysis of system interdependencies and creation of documentation
Data extraction and reimplementation 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

Specialized Machinery Manufacturing (RM)

Managing System Engineer for network security issues, consulting and support
Planning and implementation of VLAN structures and routing
Implementation of a firewall solution and system hardening
Appointed as sole external IT administrator and taking on an IT security leadership role
Building a new server infrastructure based on Windows Server 2016
Setting up security policies according to BSI basic protection and GDPR consulting
Cloud re-migration of services such as email from O365/Azure to Exchange 2019
Support in securing specialized machines
Project management, oversight of external service providers, and sourcing
Dell servers, Dell clients, Sophos SG, HPE, Ruckus Networking, Cisco firewalls and switches
Microsoft AD 2008R2/2019, Microsoft Exchange 2010/2019, email archiving, email encryption
NextCloud, DATEV, Microsoft IIS 2019, Microsoft Terminal Services cluster
VMware Hypervisor 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 segmentation, SDSL, fiber optics

Dec 2015 - Apr 2024

8 years 5 months

External IT Management / IT Architect

Food Sector (P)

Taking over internal IT management and collaborating as a shared CIO / CISO
Building a complete IT infrastructure for 20 people within four working days
Implementing terminal server functions and an IT security policy
Implementing separate network segments and VLANs across two locations
Integration of a promotional guest network separated from the internal network
Planning based on BDSG, GDPR, and BSI basic protection
Unifying the security infrastructure and system hardening
Dell servers, 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 PBX, Zammad, Elasticsearch
Backup: Veeam, system monitoring with Check_mk, SIEM, PHP, MariaDB, jQuery

May 2015 - Apr 2024

9 years

CEO / CIO / CISO

Webhosting / Application Service Provider / Managed Services

Complete takeover of internal IT management
Assessing the current state and defining the target state
Implementation of the central server infrastructure including procurement
Use of multi-layered methods for intrusion prevention achieving A/A++ ratings
Interface functionality and sourcing
Objectives and planning based on BDSG, GDPR, and BSI basic protection
Dell servers, Dell clients, Sophos SG, HPE, Cisco firewalls 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)

Assessing the current situation and troubleshooting an unstable IT structure
Developing a new IT structure and technical project management
Interface functionality and organization of various technical projects
Conducting employee training and budget responsibility
Using multi-layered methods for intrusion prevention (digital and analog)
Dell servers, 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)

Assess current state and define target state
Troubleshoot and fix an inefficient IT structure
Design a new IT structure including interface functionality
Conduct staff training and manage budget
Implement multi-layer intrusion prevention methods
HPE/IBM/Dell servers, Dell clients, Sophos SG firewall
Microsoft AD 2003/2008, Microsoft Terminal Services cluster, load balancing
Microsoft Exchange 2013, mail 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)
Provide consulting and support via a ticket system
Assess current state and define target state
Implement central server infrastructure including procurement
Implement remote access options and an IT security policy
Harden systems and implement a new IT structure with separate network segments/VLANs
Separate guest network from internal networks
Replace existing communication between sites with high-performance wireless point-to-point technology
Implement interface functionality and sourcing
Planning based on BDSG, GDPR, 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

Medium-sized enterprise (MN)

Full takeover of internal IT management with interface functionality, consulting, and support
Assess current state and define target state
Analyze, create, and implement the IT security policy
Harden systems and implement a new IT structure with separate network segments and VLANs
Separate machine network from management and employee network
Deploy current multi-layer intrusion prevention methods
Successfully defend against malware attacks via USB sticks without impact on corporate network
Project management and rescue of a failing development project
HPE/Dell servers, HPE/Dell clients, Sophos SG, HPE, Cisco firewalls and switches
Microsoft AD 2003/2008R2/2019, Microsoft Exchange 2010/2019, mail archiving
Microsoft IIS 2010-2019, Microsoft SQL Server, DBA, database administration
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'd like to thank you for taking the time to look at my resume.

You're looking for a person:

with well over ten years of hands-on experience across the depth and breadth of IT implementation, plus entrepreneurship? (privately about twice that)
with planning, consulting, and implementation experience, working industry-neutrally but not overlooking industry-specific elements
with practical knowledge of data protection and security, licensing, and legal issues, and who can and wants to apply this to assess your environment? (not legal advice!)
consulting, planning, and implementing with familiarity in Microsoft, SaaS, closed source, and open source
who brings practical know-how in dealing with employees, shareholders, and stakeholders of IT and organizations? Leading and supporting. Executing internally and externally. Leading internally, leading externally, advising externally.
with experience in SMEs, industry-neutral, with a direct team size of 5-100 and indirect (subdivision) up to approximately 45,000
who wants to implement projects long-term for the benefit of all involved with their own enthusiasm?

If that's the case, you don't have to look any further. As you can see from my following resume, I am happy to bring these skills into short- or preferably long-term projects in this breadth.

I look forward to our exchange on how I can bring my skills to your company's advantage.

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

Kind regards,

Christian Enderle

Skills

Deep And Broad Knowledge Of Tcp/Ip, Telecommunications, Networking, Firewalling, Various Open Source And Industry Software, Sql, Plus Extensive Virtualization And Conceptual Skills.
A Wide Range Of Hardware, Security Equipment And Firewall/Utm Vendors, Antivirus Software, Troubleshooting (2nd, 3rd Level...).
Technically: Shop Systems, Learning Tools (E-Learning), Crm, Cms, ...
Analytical (Other) Skills: Go-To-Market Analysis, Marketing Approaches, Intercultural Communication.
Social Skills: Presentation (De/En) Tailored To The Audience, Staff, Team And Project Management, Conflict Resolution (Technical/Social), Mediation, Uniting Interest Groups.

Languages

German

Native

English

Advanced

Education

Oct 2020 - Present

unknown

business law

Oct 2012 - Jul 2018

Ulm/Neu-Ulm University of Applied Sciences

Bachelor of Science · business informatics · Neu-Ulm, Germany

Oct 2010 - Jun 2013

Evening high school

general A-levels

...and 1 more

Certifications & licenses

Project and Team Management Professional

PMC-Sattler

IT Service Management ITIL3 Foundation

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

Created

April 2025

Last Update

July 2026

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Frequently asked questions

Have questions? Find more information here.

Where is Christian based?

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

What languages does Christian speak?

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

How many years of experience does Christian have?

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.

What roles would Christian be best suited for?

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.

What is Christian's latest experience?

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

What companies has Christian worked for in recent years?

In recent years, Christian has worked for IT-Neuaufbau (PF), Unterstützung IT/Linux Landschaft (SIE), Multinationales Umfeld (ZE), Aufbau ASP-Struktur, and Management Developer (RY).

Which industries is Christian most experienced in?

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.

Which business areas is Christian most experienced in?

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

Which industries has Christian worked in recently?

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

Which business areas has Christian worked in recently?

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

What is Christian's education?

Christian holds a Bachelor in business informatics from Ulm/Neu-Ulm University of Applied Sciences.

Does Christian have any certificates?

Christian has 2 certificates. These include: Project and Team Management Professional and IT Service Management ITIL3 Foundation.

What is the availability of Christian?

Christian is immediately available full-time for suitable projects.

What is the rate of Christian?

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