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 Rebuild (PF) .

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

In recent years, Christian has worked for IT Rebuild (PF) , IT/Linux Landscape Support (SIE) , Multinational Environment (ZE) , Hafnium Hack Incident Handling , and ASP Structure Setup .

Q: Which industries is Christian most experienced in?

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

Q: Which business areas is Christian most experienced in?

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

Q: Which industries has Christian worked in recently?

Christian has recently worked in industries like Information Technology (IT) , Tourism and Hospitality , and Food and Beverage .

Q: Which business areas has Christian worked in recently?

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

Recommended expert

Stadtallendorf, Germany

Experience

Jun 2022 - Apr 2024

1 year 11 months

IT Consulting / IT Rebuild

IT Rebuild (PF)

Analyzing requirements and the current state
Migrating an old domain structure and Tobit system to Exchange 2019 with connection to MS365
Evaluating implementation options and planning the protection of sensitive data
Planning according to BSI IT baseline protection, German Federal Data Protection Act (BDSG), and GDPR
IT governance and IT security backtests
Supporting 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 Landscape Support (SIE)

Migrating native installations into virtual environments
Consulting and support for high-availability implementations and IT security (VPN/WLAN)
Testing procedures for evaluation and authentication consulting
Analytical identification of root causes (repair vs. rebuild)
Evaluating future viability and coordinating 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

Multinational Environment (ZE)

Analyzing and rebuilding terminal servers in a multi-hierarchical environment for 45,000 global users
Troubleshooting local and global incidents and escalation management
User training on 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, email 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 in SMEs, healthcare, and local authorities
Investigating the hack, analyzing the attack methods, and isolating infected systems
Assessing attack vectors and checking for web shells
Correspondence with executive management for risk assessment from a system security and GDPR perspective
System hardening and implementation of security measures
Liaison 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 Lead

ASP Structure Setup

Analyzing requirements and the current state
Evaluating implementation options and planning the approach
Preparing the protection of sensitive data according to BSI IT baseline protection, BDSG, and GDPR
Technical project management and building a system monitoring infrastructure
IT governance planning and IT security backtests
Implementing 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

Kommune (GS)

Analysis of requirements and the current situation for 150 employees
Planning a seamless upgrade path from Exchange 2010 to Exchange 2019
Support in securing sensitive data and troubleshooting previous configurations
Consulting in regards to BSI IT baseline protection, German Federal Data Protection Act, and GDPR
Cleanup of IT legacy issues and technical project management
Hyper-V 2016/2019, VMware, Windows, Exchange 2010/2013/2019
Cisco switches, Fortigate firewalls, mail archiving, proxy, email encryption, Veeam backup

Jan 2020 - Apr 2020

4 months

Network Rebuild / IT Consultant

Medizinischer Verbund (MLOS)

Analysis of requirements and creation of a high-level concept for network routing and segmentation
Rollout of the network structure according to target definition at various sites
Troubleshooting a failed 1.5-year telecom rollout project within 1.5 months
Consulting on special medical requirements, BSI IT baseline protection, and GDPR
Planning of a high-availability network infrastructure for the data center
Network troubleshooting, VLAN, pfSense, FreeNAS, Proxmox virtualization
Debian, Ubuntu Linux, SIEM, Cisco, Ruckus switches, 3cx telephony system

Nov 2019 - Dec 2020

1 year 2 months

IT Restructurer / Renovator

Spezialelektronik (HS)

Assessment of the current situation and troubleshooting an unstable IT structure for 150 employees
Design 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

Sicherheitsdienst (WS)

Crisis management and isolation of IT traffic to prevent the spread of ransomware
Redeployment of the IT structure and consulting the company management for 1,250 employees
Implementation of a firewall with IDS/IPS and email 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

Managemententwickler (RY)

IT and IT security leadership role as a System Engineer
Fixing process 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)

Took over and revamped an outdated, insecure website and web shop setup based on Docker
Analyzed system interdependencies and created documentation
Extracted data and reimplemented on current OS 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 sole external IT administrator and took on an IT security leadership role
Built a new server infrastructure based on Windows Server 2016
Set up security policies according to BSI IT Baseline Protection and GDPR consulting
Migrated cloud services such as mail from O365/Azure to Exchange 2019
Supported in securing special machinery
Project management, external vendor coordination and sourcing
Dell servers, Dell clients, Sophos SG, HPE, Ruckus Networking, Cisco firewalls and switches
Microsoft AD 2008R2/2019, Microsoft Exchange 2010/2019, mail archiving, mail 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, Wi-Fi segmentation, SDSL, fiber optics

Dec 2015 - Apr 2024

8 years 5 months

External IT Management / IT Architect

Food Sector (P)

Took over the internal IT management and worked as shared CIO/CISO
Set up 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 sites
Integrated a public guest network separated from the internal network
Planned based on BDSG, GDPR and BSI IT Baseline Protection
Unified the security infrastructure and hardened systems
Dell servers, Dell clients, Sophos SG firewall, HPE switches, Microsoft AD 2012R2
Microsoft Exchange 2016, Microsoft 365, Teams, mail archiving, mail 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

Full takeover of internal IT management
Assessed the current state and defined the target requirements
Implemented the central server infrastructure including procurement
Employed multi-layered intrusion prevention methods achieving A/A++ ratings
Interface functionality and sourcing
Defined goals and planned based on BDSG, GDPR and BSI IT Baseline 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, To Do, Lists, SharePoint, mail 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, Wi-Fi segmentation

Sep 2013 - Aug 2017

4 years

External IT Management / IT Architect

Media Industry / Event Agency (MAH)

Assessed the current state and troubleshot an unstable IT structure
Developed a new IT structure and handled technical project management
Managed interface functionality and organized various technical projects
Conducted staff training and managed budgets
Applied multi-level intrusion prevention methods (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

Fine-Dining and Hospitality (B)

Assessing the current situation and developing a target definition
Troubleshooting and fixing an inefficient IT structure
Developing a new IT structure including interface functionality
Conducting staff training and managing the budget
Implementing multi-layered 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

Hotel Industry (KS)

Complete takeover of internal IT management as CIO, CISO, and System Engineer (2nd/3rd level)
Providing consulting and support via a ticketing system
Assessing the current situation and defining the desired state
Implementing the central server infrastructure including procurement
Implementing remote access solutions and an IT security policy
System hardening and implementing a new IT structure with separate network segments/VLANs
Separating the guest network from internal networks
Replacing the previous inter-site communication with high-performance WLAN radio link technology
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 2008 R2/2019, Microsoft Exchange 2010/2019, Microsoft Hyper-V 2008-2019
Microsoft IIS 2010-2019, Debian Linux, FOSS evaluation, system monitoring (Checkmk)
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)

Complete takeover of internal IT management with interface functionality, consulting, and support
Assessing the current situation and defining the target state
Analyzing, developing, and implementing the IT security policy
System hardening and implementing a new IT structure with separate network segments and VLANs
Separating the machinery network from the management and staff network
Using current multi-layered intrusion prevention methods
Successfully defending against malware attacks via USB sticks without negative impact on the company network
Project management and rescuing a failing software development project
HPE/Dell servers, HPE/Dell clients, Sophos SG, HPE, Cisco firewalls and switches
Microsoft AD 2003/2008 R2/2019, 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
Rolling out Kaspersky and replacing it with ESET antivirus (client/server), VoIP PBX
Services: DNS, DHCP, TCP/IP, subnetting, firewalling, routing, NextCloud, SIEM, VLAN, WLAN, network segmentation

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (13.5 years), Tourism (11.5 years), Food and Beverage (8.5 years), Manufacturing (6 years), Media and Entertainment (4 years), and Retail (2 years).

Information Technology

Tourism

Food and Beverage

Manufacturing

Media and Entertainment

Retail

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (13.5 years), Project Management (13.5 years), Operations (11.5 years), and Procurement (11.5 years).

Information Technology

Project Management

Operations

Procurement

Summary

First, I would like to thank you for taking the time to review my resume.

You are looking for a person:

with well over ten years of hands-on experience in the depth and breadth of IT implementation, combined with entrepreneurship? (privately even twice as much)
with planning, consulting, and implementation experience working across industries, without ignoring sector-specific elements
with practical knowledge in data protection and security, licensing & legal issues, who can and wants to bring this to the assessment of your environment? (not legal advice!)
consulting, planning, and implementing with Microsoft, SaaS, closed source, as well as open source familiarity
who brings practical know-how in dealing with employees, shareholders, and stakeholders of IT and business? Leading and supporting. Internally executing, externally executing. Internally leading, externally leading, externally advising.
with experience in SMEs, industry-neutral, with direct staff size: 5-1,000, indirectly (partial area) up to about 45,000
who, with personal enthusiasm, wants to implement projects in a way that benefits all involved in the long term?

If this is the case, you don't have to look any further. - As you will see from my resume below, I am happy to bring these skills broadly to short- or, preferably, long-term projects.

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

I will definitely be in touch and look forward to the upcoming project and fruitful collaboration.

Best regards,

Christian Enderle

Skills

Deep And Broad Knowledge In Tcp/ip, Telecommunications/telephony, Networking, Firewalling, Various Open-source Software, Various Industry-specific Software, Sql, And A Wide Range Of Virtualization And Design Concept Knowledge.
Wide Range Of Hardware, Security Equipment And Firewall/utm Vendors, Antivirus Software, Troubleshooting (2nd And 3rd Level…).
Technical: E-commerce Systems, Learning Tools (E-learning), Crm, Cms, …
Analytical Skills: Go-to-market Analysis, Marketing Approaches, Intercultural Communication.
Social Skills: Presentations (De/en) Tailored To The Audience, Staff, Team And Project Leadership, Conflict Resolution (Technical/social), Mediation, Bringing Interest Groups Together.

Languages

German

Native

English

Advanced

Education

Oct 2020 - Present

unknown

Business Law

Oct 2012 - Jul 2018

University of Applied Sciences Ulm/Neu-Ulm

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

Oct 2010 - Jun 2013

Evening High School

General high school diploma

...and 1 more

Certifications & licenses

Project and Team Management Professional

PMC-Sattler

IT Service Management ITIL3 Foundation

Profile

Created

April 2025

Last Update

December 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

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 Rebuild (PF).

What companies has Christian worked for in recent years?

In recent years, Christian has worked for IT Rebuild (PF), IT/Linux Landscape Support (SIE), Multinational Environment (ZE), Hafnium Hack Incident Handling, and ASP Structure Setup.

Which industries is Christian most experienced in?

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

Which business areas is Christian most experienced in?

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

Which industries has Christian worked in recently?

Christian has recently worked in industries like Information Technology (IT), Tourism and Hospitality, and Food and Beverage.

Which business areas has Christian worked in recently?

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

What is Christian's education?

Christian holds a Bachelor in Business Informatics from University of Applied Sciences Ulm/Neu-Ulm.

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.