Thomas Krummenacher
Senior ICT System Engineer
Experience
Senior ICT System Engineer
Abraxas Informatik AG
- Operating and supporting Windows server systems (patching, monitoring, and testing)
- Operating and further developing virtualization & MDM platforms (VMware, Hyper-V, Citrix, VDI, MobileIron), including backup & storage
- Operating and maintaining Citrix ADC environments
- Server management (AD, file servers, SCCM, print servers, DNS, DHCP, SQL, DB operations)
- Ensuring release and patch management as well as software deployment
- Operating the central IAM infrastructure, including WAF/WAM
- System monitoring and automation as well as lifecycle management
- Participating in and coordinating projects and executing change requests
- Creating and updating system documentation
- Incident, change, and problem management
- 2nd and 3rd level ticket handling
- On-call duty
- Supplier management
IT System Engineer (Project)
Abraxas Informatik AG
- Microsoft Active Directory and domain controllers, ADFS, DNS, DHCP, GPO, IIS, WSUS, proxy, KMS, RDS, Windows Firewall, Windows file & SQL cluster administration & engineering & troubleshooting
- Managing and operating Windows Server 2022/2019/2016/2012
- Project planning & execution: replacing Ricoh & Windows print servers across all Abraxas Switzerland
- Azure administration & engineering
- SCCM administration & software deployment
- Hyper-V administration & engineering
- VMware vSphere 7 administration & engineering
- Handling tickets and incidents with ServiceNow
- Creating PowerShell scripts for task automation
- Windows application server 2022/2019/2016/2012 installation, configuration & troubleshooting
- Windows application server migrations (Terris/IIS/print servers/MS SQL database servers)
- Creating IT documentation in Confluence
- IPAM network administration and configuration
- Collaborating with network engineers for firewall releases and troubleshooting
- Second level support
IT System Engineer (Project)
Atos Switzerland
- Active Directory, ADFS, DNS, DHCP, GPO administration & engineering
- Troubleshooting Windows servers & applications
- VMware vSphere 7 administration & engineering
- Handling tickets and incidents
- PowerShell scripting
- Puppet scripting
- Windows Server 2016 installation & configuration
- Server application installation & configuration
- Using TortoiseSVN for version control of IT documentation
- Creating IT documentation
- Collaborating with IT specialists via Circuit and Microsoft Teams
IT Engineer (Project)
Heineken Switzerland
- Windows Server 2012–2016 installation & configuration
- Windows 2016 RDS server configuration
- Planning and executing Windows Server migrations
- Active Directory, ADFS, DNS, DHCP, GPO administration & engineering
- Exchange administration
- PowerShell scripting
- Planning & executing a Canon UniFlow printer migration project for all Heineken Switzerland sites
- SFTP server configuration
- Migrating from SEP Antivirus to Microsoft Defender (client & server)
- Migrating phone system to Openscape 4000
- IT project GFOS time management
- Second level support for Windows 10 / Office 365 clients
- Access DB application support
- Collaborating with Orange on WAN network/firewall
- Collaborating with T-Systems on server hosting
- Creating IT documentation
IT System Engineer
Hays, Gulp, Randstad
- System engineering and administration of Microsoft Windows Server Active Directory, domain controllers, certification authority, ADFS, DNS, DHCP, GPO, PKI
- Azure cloud engineering and administration
- Windows Server 2016 & 2019 installation & configuration
- Active Directory disaster recovery
- Office 365 / SharePoint administration
- Monitoring Windows / Linux servers (HP) and the network environment with SCOM
- Change and release management of supported systems
- SCCM (Endpoint Configuration Manager) engineering and administration
- Migrating Windows Server 2008/2012 application servers to Windows Server 2016 in Azure cloud
- Domain controller / DNS migration to Windows Server 2016
- Microsoft SQL 2008 to 2016 migration, Microsoft IIS 7.5–10
- Global patch management with WSUS
- Exchange administration
- VMware engineering & administration
- PowerShell scripting
- SQL Server installation and administration
- Citrix XenApp 7.x administration & configuration
- Engineering, monitoring, and operating Microsoft Windows 7 & 10 clients
- Responsible for software deployment with SCCM 2012/2016
- Independently coordinating and executing projects and new requirements
- Incident, change, problem, configuration, and release management
- 2nd & 3rd level support in Windows Server / Active Directory environments
- Fileserver reengineering (troubleshooting, file structure adjustments, VSS implementation, cleaning scripts)
- Print server installation & configuration
- Supporting production environment IT
- Creating GPOs
- Microsoft Teams / Skype
- ServiceNow administration
ICT System Engineer (Project)
Profilogic AG
ICT System Engineer (Project)
Sika Informationssysteme AG
Windows Server System Specialist
Sunrise AG
Windows Server Specialist
Emil Frey AG
Windows Server System Specialist
Migros Luzern
IC System Specialist
Bucher Hydraulics AG
IT Analyst
Johnson & Johnson
Client System Engineer / Client Support
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 (18 years), Healthcare (5 years), Pharmaceutical (5 years), Manufacturing (4 years), Telecommunication (3 years), and Automotive (3 years).
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 (31 years), Project Management (9 years), Operations (8 years), and Customer Service (8 years).
Summary
I make sure your IT infrastructure runs reliably, your business applications are used efficiently and securely by employees, and new technologies are evaluated, procured, and introduced professionally.
I draw on my many years of experience in IT with Windows platforms, my IT-specific training, and my skills as a system engineer, administrator, and second/third level supporter.
I'm used to working independently and reliably at a high-quality level and gladly take the initiative when tasks arise.
I enjoy working with people and can communicate clearly and effectively.
Skills
Extensive Long-term Experience With Windows Domains, Active Directory, And Windows Server Environments (Ad / Dhcp / Dns / Iis / Adfs / Pki / Cluster)
Many Years Of Virtualization Experience With Vmware And Hyper-v
Successful Execution Of It Projects
Experience With Azure Environments / Microsoft 365
Experience With Linux
Experience With Citrix
Experience With Sql
Patching Servers And Clients With Wsus
Software Deployment With Sccm
Monitoring It Environments With Scom, Manageengine Opmanager, And Prtg
Planning, Installation & Configuration Of Application Servers
Automating Processes With Powershell Scripts
Windows Server 2008 / 2012 / 2016 / 2019 / 2022 / 2025 5 16 / 12 / 8 / 5 / 3 / 1
Azure Cloud 3 3
Active Directory 5 10
Domain Controllers 5 10
Sharepoint 3 3
Dhcp, Dns 4 8
File Server 4 8
Iis 4 7
Gpo, Ca, Adfs 4 8
Cluster Server 4 8
Sql Server 3 8
Exchange Server 3 2
Server Hardware 3 10
Scom 4 8
Sccm 3 3
Frontrange / Enteo Dsm 3 2
Vmware 4 10
Citrix Xenapp / Xenserver 3 4
Hyper-v 4 8
San / Storage Infrastructures 2 3
Backup / Disaster Recovery 3 4
Veeam 3 3
Windows 7 5 10
Windows 10 5 7
Windows 11 5 3
Wsus 5 10
Antivirus (Mcafee, Symantec, Kaspersky, Trend Micro, Microsoft) 5 10
Tcp/ip 4 15
Firewalls 3 6
Pki 3 3
Powershell Scripts 3 5
Linux Server 3 3
Technical Writing 4 8
Skype For Business 3 3
Mobile Devices 4 5
Microsoft Teams 4 3
Canon & Ricoh Printers & Software 4 2
Microsoft 365 3 3
Vmware 5 5
Storage 3 3
Networks 3 5
Languages
Education
Landis & Gyr Zug
Commercial Training · Zug, Switzerland
Loretto
Secondary School · Switzerland
Certifications & licenses
Microsoft Certified System Administrator
Microsoft
Profile
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