Volker R.-IT Consultant, IT Architect, Senior System Administrator and Lecturer
Check rate
Experience
Architect and Senior System Administrator
International trading company
- Analysis and optimization of the VMware environment for operation in a KRITIS environment
- Planning and implementation of updates to the VMware and hardware environment in a KRITIS environment
- Set up Skyline Health Diagnostics
- Review of the existing documentation
- Training and onboarding of new internal employees
- Support with migration and upgrade projects
- Preparations for moving scripts in the virtualization environment to GitLab
- Ticket processing with Service.Now
Acting Team Lead
Global manufacturer of replacement parts in the automotive sector
- Acting team lead of the IT-OPS team with a total of 25 internal and external employees
- Prioritization of projects and resources
- Coordination of projects and priorities with other departments
- Employee management
- Creation and review of annual goals for each employee
- Hiring of new employees, including job advertisements and interviews
Architect and Senior System Administrator
Global manufacturer of replacement parts in the automotive sector
- Technical project management for the architecture and implementation of a new, modular virtualization environment for 1,000 – 10,000 VMs
- Migration to the new VMware environment
- Migration from VMware 7 to VMware 8 (vCenter and hosts)
- VMware/Broadcom license optimization, coordination of licensing and hardware design, coordination of license packages
- Training / onboarding of new internal and external employees
- Improvement of the architecture of the current server deployment
- Set up of a new server deployment including architecture (planning and implementation)
- Improvement of the architecture of the existing VMware environment
- Takeover of various smaller projects
- KMS license management for the entire company
- Microsoft CSE/SQL license optimization
- Migration of an old MSSQL 2008 cluster to virtual hardware
- Revision of maintenance windows
- SCCM patch management
- Evaluation and introduction of a central password manager
- Ticket processing and project planning with Atlassian JIRA
Senior System Administrator / IT Manager
International event agency
- Introduction of NAS systems
- Migration to Office365
- Migration from SBS2011 to Windows Server2019
- Development and implementation of a data backup concept
- Consolidation of physical servers onto virtual servers
- Redesign of data networks
Senior System Administrator and Architect
Municipal utility and service company
- Technical project management for the architecture and implementation of a new, modular virtualization environment for 5,000 – 25,000 VMs
- Training / onboarding of new internal and external employees
- Management of a team of external employees
- Improvement of the architecture of the current server deployment
- Project management for setting up a new server deployment including architecture (planning and implementation)
- Project management for the migration of the server deployment (planning and implementation)
- Project management for rebuilding self-service for the deployment of Linux laptops
- Improvement of the VMware environment architecture
- Takeover of various smaller projects
- KMS license management for the entire company
- VMware and Microsoft CSE/SQL license optimization
- Prioritization of projects and manpower
- Planning and prioritization of resources
- Server deployment (automatic and semi-automatic deployment)
- SCCM patch management
- Revision of maintenance windows
Senior System Administrator
Municipal Utilities and Services Company
- Server deployment
Senior System Administrator
International Corporation
- Installation of physical/virtual Windows systems
- Support and administration of large virtualization environments (VMware)
- Support, administration and installation of HP Enclosures and Blades
- Monitoring of the virtualization environment (VMware VCOPs/vROMs and vCheck)
- Installation and operation of ESXi servers
- Installation of ESXi server updates
- Onboarding of new internal and external employees
- Creation of onboarding plans
- Support in selecting suitable applicants
- Technical support during data center relocations
- Data center operations including on-call duty, especially in the high-security data center
- Review of software licensing for virtualization and support for the licensing department
- End-user support for technical problems; professional customer consultation
- Management of objects in Active Directory
- Creation and customization of scripts
- Maintenance of relevant system documentation, such as the authorization concept and any applicable related documents
- Incident/Problem Management / Change Management as part of problem resolution, if necessary through remote access
- Change Management - updates to systems or system-related software (new patches)
- Change Management - configuration changes
- Implementation of security alerts (security-related patches)
- Security Management (virus scanning, CERT settings)
- Business continuity for servers and services
- Setup and management of the user environment (User Administration)
- Performance Management / Resource Management
- Event Management
- Expansion of server storage via SAN / NAS
- Migration of storage for virtualization to systems from PURE
- Operation and configuration of SAN storage from PURE Storage (All Flash Storage)
- Maintenance and management of additional system-related software
- Management of printer environments (Printer Administration)
- Changing permissions through Active Directory (AD)
- Development of an authorization concept for access to vCenter
- Service Availability Management / Capacity Management
- Setup of Systems Management (ensuring the contractually agreed SLA's)
- Customer/system/application-specific settings (Customizing)
- Installation, setup and management of additional system-related software
- Working with BMC Remedy and FITS (Problem/Change Management) and AixpertSoft AixBoms (CMDB)
- Working with GitHub/GitLab and a proprietary version control software from the customer
Server Infrastructure Migration / Virtualization
Wholesale Food Company
- Replacement of server hardware
- Software license audits
- Replacement of VMware ESX 4.x with ESX 5.5
- Migration of existing data and mailboxes
- Introduction of MS Active Directory, MS Exchange Server and GFI Faxmaker
- Replacement of various printers with a centralized MFP solution
- Development and implementation of a data backup concept
- Preparation and provision of server systems for an ERP system
- Connecting sites via VPN
- Creation of detailed documentation for the network and IT systems
- Employee training
Senior System Administrator in Securities Trading/Stock Exchange
International Banking Corporation
- Installation of physical/virtual Windows systems
- Installation of release updates (OS + applications)
- Administration and installation of virtualization environments (VMware), HP Enclosures, Blades, Double Dense Blades and rack servers, ESXi servers
- Operation of MS Server Cluster
- System monitoring
- Management of objects in Active Directory
- Creation and customization of scripts (Batch, CM, PowerShell)
- Administration of data center operations including on-call duty
- End-user support and administration for technical problems; professional customer consultation
- Maintenance of relevant system documentation
- Incident, Problem, Change Management
- Software Licence Management and Software Asset Management for the virtualization solution
- Security and User Management
- Performance Management / Resource Management
- Expansion of server storage via SAN / NAS
- Management of printer environments (Printer Administration)
- Management of fax server environments
- Troubleshooting and support for applications
Server Infrastructure Migration / Virtualization
Law Firm
- Replacement of server hardware
- Replacement of VMware ESX 4.x with ESX 5.5
- Migration of existing data and mailboxes
- Introduction of MS Active Directory, MS Exchange Server and GFI Faxmaker
- Replacement of various printers with a centralized MFP solution
- Development and implementation of a data backup concept
- Creation of detailed documentation for the network and IT systems
- Employee training
- Software license audits
Senior System Administrator
International Corporation
- Installation of physical/virtual Windows systems
- Support and administration of large virtualization environments (VMware)
- Support, administration and installation of HP Enclosures and Blades
- Monitoring of the virtualization environment (VMware VCOPs and vCheck)
- Installation and operation of ESXi servers
- Technical support during data center relocations
- Data center operations, including on-call duty, particularly in the high-security data center
- End-user support for technical problems; technical customer consulting
- Managing objects in Active Directory
- Creation and modification of scripts
- Maintenance of relevant system documentation, such as authorization concepts
- Incident/Problem Management / Change Management as part of problem resolution, where necessary via remote access
- Change Management - updating systems and system-related software (new patches)
- Change Management - configuration changes
- Implementation of security telegrams (security-relevant patches)
- Security Management (virus scans, CERT settings)
- Business Continuity for servers and services
- Setting up and managing the user environment (User Administration)
- Performance Management / Resource Management
- Event Management
- Expanding server storage via SAN / NAS
- Maintaining and managing additional system-related software
- Managing printer environments (Printer Administration)
- Changing permissions via Active Directory (AD)
- Service Availability Management / Capacity Management
- Setting up Systems Management (ensuring the contractually agreed SLA)
- Customer-, system- and application-specific settings (Customizing)
- Installing, setting up and managing additional system-related software
- Working with BMC Remedy (Problem/Change Management) and AixpertSoft AixBoms (CMDB)
Set up and support of client/server network
Regio Media Networks UG
- Consulting and implementation for the setup and operation of a client-server network under Windows 7 and Windows Small Business Server 2008
- Setting up a network fax solution for sending bulk faxes
- Connecting a portal solution, PayPal and the local accounting solution
IT Manager
Ortholutions GmbH & Co. KG
- Planning, coordinating and carrying out the relocation of the complete IT infrastructure to new business premises
- Planning, coordinating and carrying out the complete network cabling in the new business premises
- Coordinating the relocation of telephone and Internet connections
IT Manager
Ortholutions GmbH & Co. KG
- Recording current hardware
- Reviewing the current network structure
- Creating a data backup concept
- Ongoing on-site IT support and remote maintenance
IT Manager
Mondversand Joey Haas
- Recording current hardware
- Dimensioning new server and network hardware and software
- Reviewing current software licensing
- Introducing SBS 2003 and domain structure
- Migration from Lexware financial Office 2002 to Lexware financial office pro 2007
- Integrating all workstations into the network
- Evaluating new hardware
- Ongoing on-site IT support and remote maintenance
- Consulting and communicating with the web agency for the operation of an online shop
IT Manager
ZIB: Center for Innovative Education of bfz gGmbH
- Inventory of current hardware
- Sizing of new server and network hardware and software
- Review of current software licensing
- Migration to educational licenses
- Software Asset Management for the training network
- Integration of all workstations into the network
- Integration of e-learning modules into the training concept
- Design of new e-learning modules
- Connection of branch offices
- Introduction of Internet access protection for students and participants using time-for-kids
- Evaluation of new hardware
- Evaluation of an address management system (COBRA Adress Plus 11 SQL, COBRA Adress Plus 11, online address database via the employment agency, customization of existing address management)
- Ongoing on-site and remote IT support
IT Officer
Kolpinghotel Munich
- Inventory of current hardware
- Sizing of new server and network hardware and software
- Review of current software licensing
- Optimization of software licensing in the Microsoft environment
- Integration of all workstations into the network
- Introduction of Internet access protection using time-for-kids
- Evaluation of new hardware
- Ongoing on-site and remote IT support
Setup and support of training network; IT Manager
EDV Training Center of Kolping Bildungswerk
- Inventory of current hardware
- Sizing of new server and network hardware and software
- Review of current software licensing
- Migration to educational licenses
- Regular Software Licence Audits
- Integration of all workstations into the network
- Integration of DATEV workstations into the network
- Change of the training operation from DATEV to Lexware
- Introduction of Internet access protection for students and participants using time-for-kids
- Evaluation of an address management system (COBRA Adress Plus 11 SQL, online address database via the employment agency, customization of existing address management)
- Separation of training and administration networks
- Restructuring of the firewall concept
- Ongoing on-site and remote IT support
Lecturer
Employment Agency on behalf of Kolping Bildungswerk
- Training for job seekers in MS Word, MS Excel, MS Outlook
Support for the internal IT department
SupplyOn AG on behalf of PC-WARE AG/Comparex AG
- Packaging and rollout of new software using Enteo NetInstall and Microsoft SCCM
- Automation of the reinstallation of laptops and desktop PCs using Enteo OSD and Microsoft SCCM
- Distribution of security updates and patches via Enteo NetInstall, MS WSUS Server and MS SCCM
- Management, creation and maintenance of S/MIME certificates and PGP keys on the e-mail encryption gateway
- Regular review of the disaster recovery concept with Symantec/Veritas Backup Exec IDR
- Migration of data backup to HP Data Protector 6.20
- Regular review of the EADR (Disaster Recovery) concept with HP Dataprotector
- Upgrade of Veritas/Symantec Backup Exec from 9.1 to 11d, 12 and 12.5
- Upgrade of enteo NetInstall from 5.7 SE to 6.0, 6.1 and 6.2
- Software distribution via MS SCCM
- Software Asset Management for Microsoft rental licenses via MS SCCM
- Software Licence Management for data backup software and communications software/telephony
- Migration from MS Office 2000 to MS Office 2007 and from MS Office 2007 to MS Office 2010
- Remediation of IT security vulnerabilities
- Preparation of the internal IT department for audits
- Review and update of the company-wide antivirus protection
- Monitoring of network, servers, etc. with OP5
- Migration of VMs from VMware ESX Server to MS Hyper-V
- User helpdesk for employees at the site and in the home office
- Support of Active Directory and MS Exchange Server
- E-mail archiving with EASY xBase, e-mail encryption with JULIA Mail-Office, MS WSUS, MS Sharepoint Portal Server 2007, MS Office Communication Server / Lync 2010 Server, MS Hyper-V Server, MS Hyper-V Cluster, VMware ESX Server, RSA-Appliance and Tokens, MacMon, OmniVista
- Creation of concepts for virtualization, RSA tokens, WLAN, Live Cycle Management and Microsoft SPLA licensing
- Evaluation of travel expense accounting, anti-spam/antivirus solution, SAN/NAS system, MS Windows Server, Exchange Server and SQL Server migrations, AD migration, VoIP PBX, video conferencing systems, WLAN network
Technician
T-VOS
- Inspection of existing defects in technical devices such as PCs, laptops, TVs, receivers, stoves, etc. for lightning, water and other damage on behalf of various insurance companies or in cases of self-inflicted damage
- Preparation of inspection reports and records
IT Officer
Insolvency Administrator Mr. Bierbach
- Deletion and destruction of data in accordance with data protection regulations for highly sensitive data (levels 4 and 5)
- Physical destruction or secure deletion of data storage devices
Disaster Recovery for MS Windows Small Business Server 2003
FAM
- Restoration of server functionality after incorrect operation
- Ensuring and restoring backups of data and Exchange mailboxes
- Reinstallation of the server and restoration of the data
- Development of a concept to prevent similar situations
Migration from MS SBS 2000 to MS SBS 2003
FAM
- Planning and implementation of the migration from Microsoft Small Business Server 2000 to Microsoft Small Business Server 2003 Standard while replacing the server hardware
IT Manager / Project Management
Second Chance Body Armor GmbH
- Introduction of an ERP system/ASAP from the USA for textile production
- Coordination between programmers in the USA and Germany, customer departments and data protection officers
- Quality control of the customizations and development of an interface to the measurement software
Lecturer
DAA Deutsche Angestellten Akademie GmbH
- Teaching retraining students in the professional fields of IT specialists and IT clerks in various subjects
- Teaching trainees in the professional fields of electricians, energy electronics technicians, IT specialists, systems electronics technicians, communications electronics technicians and radio electronics technicians
IT Manager, IT Support
Second Chance Body Armor GmbH
- On-site and remote support for servers, hardware-based virus scanners, desktop systems and laptops
- Close cooperation with administrators at the headquarters in Michigan/USA and state data protection officers
- Complete dismantling and data protection-compliant disposal of the IT infrastructure following the insolvency of the parent company
Project Manager
Second Chance Body Armor GmbH
- Planning a data network and telephone network, including a telephone system, for office buildings and a warehouse
- Technical design and dimensioning, as well as supervision of cable installation work
- Setting up a VPN connection to the parent network in Michigan/USA
IT Manager
Vereinigte Riederinger Hafnerei GmbH
- Support for the IT network of a craft business and simplification of daily tasks on-site and via remote support
Lecturer
Kolping Bildungswerk München/Oberland
- Teaching trainees in the field of electrical engineering
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Education, Information Technology, Professional Services, Food and Beverage, Manufacturing, and Retail.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Operations, Human Resources, Project Management, Customer Service, and Quality Assurance.
Summary
I am an IT expert with extensive experience in virtualization, server architecture and system administration. I have managed and optimized large-scale IT infrastructures in various industries. My strengths lie in planning and carrying out migrations, upgrades and license optimizations, ensuring smooth operations in complex environments.
I have successfully led technical teams and training initiatives, providing smart, practical solutions for both high security requirements and day-to-day operational needs. My approach combines technical expertise with hands-on leadership and a strong background in IT service management.
Translated with DeepL.com (free version)
Skills
Operating Systems: Microsoft Windows Server 2025, 2022, 2019, 2016, 2012r2, 2012, 2008r2, 2008, 2003, 2000
Operating Systems: Microsoft Windows 11, 10, 8, 7, Vista, 2000, Xp
Operating Systems: Microsoft Windows Small Business Server 2011, 2008 And 2003
Operating Systems: Linux Basics (Sles, Red Hat, Ubuntu, Debian, Centos)
Virtualization: Vmware Esxi Server
Virtualization: Vmware Vsphere Vcenter
Virtualization: Vmware Vcops / Vroms
Virtualization: Vmware Srm
Virtualization: Vmware Vsan
Virtualization: Vmware Nsx
Virtualization: Vmware Infrastructure Client
Virtualization: Vmware Infrastructure Converter
Virtualization: Vmware Replication
Virtualization: Vmware Aria Operations Automation
Virtualization: Vmware Aria Operations For Log
Virtualization: Vmware Skyline Health Diagnostics
Virtualization: Microsoft Hyper-V
Virtualization: Microsoft Virtual Server 2003
Virtualization: Microsoft Virtual Pc 2005
User Software: Microsoft Office 2022, 2019, 2016, 2013, 2010, 2007, 2003, Xp, 2000
User Software: Microsoft Office365
User Software: Lexware Financial Office 2021 And Previous Versions From 2005 Onward
Databases: Microsoft Sql Server
Collaboration Software: Microsoft Exchange Server 2019, 2016, 2013, 2007 And 2003
Collaboration Software: Microsoft Sharepoint Services (Wss)
Collaboration Software: Microsoft Sharepoint Server 2007 (Moss)
Collaboration Software: Microsoft Office Communication Server 2007
Collaboration Software: Microsoft Lync 2010
Collaboration Software: Microsoft Skype
Collaboration Software: Easy Xbase E-Mail Archiving
Software Distribution And Patch Management: Microsoft Windows Server Update Services (Wsus)
Software Distribution And Patch Management: Microsoft Sccm
Software Distribution And Patch Management: Frontrange Enteo Netinstall (Software Distribution And Softwareshop)
Software Distribution And Patch Management: Frontrange Enteo Osd (Operating System Distribution)
Software Distribution And Patch Management: Hyperdb
Software Distribution And Patch Management: Eurodb
Software Distribution And Patch Management: Hpsa
Scripting: Powershell
Scripting: Batch / Cmd
Version Control Software: Gitlab
Version Control Software: Github
Version Control Software: Proprietary Customer Solution
Virus And Spam Protection: Trend Micro Office Scan
Virus And Spam Protection: Trend Micro Server Protect
Virus And Spam Protection: Trend Micro Mailscan For Microsoft Exchange
Virus And Spam Protection: Trend Micro Interscan Web Security Suite
Virus And Spam Protection: Trend Micro Interscan Messaging Security
Virus And Spam Protection: Eset End Point Protection
Virus And Spam Protection: Eset Mail Server Protection
Virus And Spam Protection: Gdata Client/Server
Virus And Spam Protection: Gdata Mailgateway
Virus And Spam Protection: Gdata Business Suite
Virus And Spam Protection: Avira Antivir Premium
Virus And Spam Protection: Mcafee Endpoint Protection
Virus And Spam Protection: Sophos Central Protect
Monitoring: Prtg
Monitoring: Checkmk
Monitoring: Op5
Monitoring: Nagios
Monitoring: Splunk
Monitoring: Vcheck
Monitoring: Vmware Vcops / Vrom
Monitoring: Ipswitch Whatsup Gold
Monitoring: Hp Monitoring Cockpit
Monitoring: Hp Sim
Monitoring: Microsoft Scom
Monitoring: Bmc Enterprise Manager (Bem)
Data Backup: Veeam
Data Backup: Symantec (Veritas) Backup Exec 2012, 2010 R3, 12.5, 12.0, 11d, 10, 9
Data Backup: Hp Dataprotector 6.20
Security: Icc Julia Mailoffice (Gateway For Email Encryption, Management Of S/Mime And Pgp Certificates)
Security: Emc² Rsa-Securid (Two-Factor Authentication For Vpn Login, Os Login)
Security: Macmon (Network Monitoring And Blocking Of Suspicious Ports)
Security: Alcatel-Lucent Omnivista (Monitoring Of Switches, Voip System And Wlan Infrastructure)
Security: Safeq (Secure Printing)
Security: Endian Firewall
Security: Ipfire Firewall
Security: Vpn: Ipsec / Openvpn
Web: Html (Basics)
Web: Php (Basics)
Cmdb: Aixpertsoft Aixboms
Cmdb: Fnt Command
Ticket Tools: Service.Now
Ticket Tools: Atlassian
Ticket Tools: Omnitracker
Ticket Tools: Bmc Remedy
Ticket Tools: Ttp
Ticket Tools: Hp Service Manager / Hp Sm
Ticket Tools: Atlassian Jira
Administration Tools: Hyena
Careful And Independent Work
Finding And Resolving Errors Before They Occur
Team Player
Quick Understanding
Analytical Thinking
Strong Willingness To Learn
Working In An International Corporate Environment
Working In The Banking/Stock Exchange Environment
Working In Data Center Environments And High-Security Data Centers
Goal-Oriented And Successful Completion Of Assigned Tasks
Working According To Deadlines And With A Focus On Results
Very Independent, Careful And Conscientious Working Style
Languages
Education
Diplom-Ingenieur (FH) · Electrical and Information Engineering, specialization in Communications and High-Frequency Engineering
Certifications & licenses
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Volker is based in Sauerlach, Germany and can operate in on-site, hybrid, and remote work models.
Volker speaks the following languages: German (Native), English (Intermediate).
Volker has at least 28 years of experience. During this time, Volker has worked in at least 19 different roles and for 24 different companies. The average length of individual experience is 1 year and 11 months. Note that Volker may not have shared all experience and actually has more experience.
Based on recent experience, Volker would be well-suited for roles such as: Architect and Senior System Administrator, Acting Team Lead, Senior System Administrator / IT Manager.
Volker's most recent position is Architect and Senior System Administrator at International trading company.
In recent years, Volker has worked for International trading company, Global manufacturer of replacement parts in the automotive sector, International event agency, Wholesale Food Company, and Law Firm.
Volker is most experienced in industries like Education, Information Technology, and Professional Services. Volker also has some experience in Food and Beverage, Manufacturing, and Retail.
Volker is most experienced in business areas like Information Technology, Operations, and Human Resources. Volker also has some experience in Project Management, Customer Service, and Quality Assurance.
Volker has recently worked in industries like Professional Services, Food and Beverage, and Automotive.
Volker has recently worked in business areas like Information Technology, Project Management, and Operations.
Volker holds a Bachelor in Electrical and Information Engineering, specialization in Communications and High-Frequency Engineering.
Volker has 1 certificate: ITIL Foundation Certificate in IT Service Management.
Volker is immediately available full-time for suitable projects.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
Average rates for similar positions
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 21 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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