Reliable IT Services
& on-site support for your business.
Your dedicated IT partner for SMBs, law firms, medical practices, craft enterprises, and service providers in the Hann. Münden and Kassel region. From reliable server and workstation environments to 3-2-1 backup strategies and rapid on-site troubleshooting — without anonymous call centers.
Comprehensive IT Services for Your Operations
We ensure your IT runs smoothly so you can concentrate fully on your core business. Dependable, modern, and securely structured.
Workstations, PCs & Hardware
Setup, configuration, and maintenance of workstations, laptops, multi-monitor setups, printers, and scanners. Migration of existing data and setup of software environments.
- Windows 11 Pro & Linux Workstations
- Hardware upgrades (SSD, RAM, Silent-Kits)
- Network printer & document scanner setup
3-2-1 Backup & Data Protection
A lost database or ransomware infection can threaten business existence. We design immutable, automated 3-2-1 backup solutions with regular restore testing.
- Local NAS + encrypted offsite cloud backup
- Ransomware protection & air-gapped backups
- Regular restore tests & documented recovery
Server, Virtualization & Cloud
Linux & Windows Server administration, hypervisors (Proxmox VE, Hyper-V), containerized application setups (Docker), and hybrid cloud integration matching your needs.
- Proxmox VE & Hyper-V Virtualization
- Debian, Ubuntu, Rocky Linux & Windows Server
- Synology / TrueNAS enterprise storage
IT Security & GDPR Compliance
Hardening IT systems against external threats. Two-factor authentication (2FA), patch management, secure email flow (SPF, DKIM, DMARC), and compliance documentation.
- Two-Factor Authentication (2FA / Passkeys)
- Email security & spoofing prevention
- Security audit & vulnerability scanning
Software, ERP & E-Invoicing
Assistance in adopting business software, mandatory E-Invoicing (XRechnung / ZUGFeRD 2025/2026), DATEV data exchange, and custom workflow digitization.
- E-Invoicing rollout (XRechnung / ZUGFeRD)
- DATEV & accounting interface sync
- Integration with Siedelmann Business Suite
Why Businesses in Hann. Münden & Kassel Trust Us
Local proximity, personal accountability, and decades of hands-on expertise without the overhead of massive corporate agencies.
Direct Point of Contact
No anonymous hotlines or ever-changing student temp workers. You speak directly with an experienced IT professional who knows your infrastructure.
Rapid On-Site Assistance
Based centrally in Staufenberg, we reach your office in Hann. Münden, Kassel, or neighboring municipalities within minutes when urgency demands it.
Vendor-Neutral Advice
We do not sell pre-bundled commission contracts. We recommend and implement exactly what makes economic and technical sense for your business.
Development & IT Combined
Unlike traditional pure-hardware shops, we also develop custom software, connect ERPs, and deploy web solutions. True full-stack capabilities.
At Home in the Border Triangle of North Hesse & Lower Saxony
Our headquarters in 34355 Staufenberg are located directly between the city of Kassel and the historic half-timbered town of Hann. Münden. We provide regular maintenance and rapid on-site assistance across the entire surrounding region.
Inquire for Your Location →Answers to IT Support Questions
Have an urgent IT issue or planned migration? Feel free to call us directly or use the inquiry form below.
Do you take over support for existing IT setups?
Yes. In most cases, complete replacement is neither necessary nor economical. We perform a structured initial inventory check, document the environment, fix security bottlenecks, and ensure smooth continuous operation.
How fast can you be on-site in emergencies?
For critical failures (e.g. server down, network outage, ransomware suspicions), we can typically be on-site in Hann. Münden, Kassel, and Staufenberg within 30 to 60 minutes. Many routine requests can also be resolved immediately via secure remote maintenance.
Do you require rigid long-term contracts?
We offer flexible cooperation: either fair billing strictly based on actual hours worked for projects and selective support, or modular monthly service agreements including regular updates, monitoring, and guaranteed response times.
How can we securely connect home office workstations?
Yes. We set up encrypted site-to-site and client-to-site VPN tunnels with two-factor authentication so your employees can access office resources securely without exposing internal networks to public internet risks.
Do you assist with statutory E-Invoicing requirements?
Yes. We assist businesses in Hann. Münden and Kassel in receiving, validating, and sending electronic invoices compliant with EN 16931 (XRechnung and ZUGFeRD), and integrating with existing accounting/ERP systems.
Request an IT Consultation or Assessment
Tell us briefly about your IT infrastructure, planned modernization, or current problem. We will get back to you promptly.
Personal & Reliable
Short communication channels, direct telephone access, and swift on-site presence across the Hann. Münden and Kassel region.
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IT Consultant & Admin Stefan Siedelmann
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Phone 01523 3790716
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Email stefan@siedelmann.com
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Location Neuenhöfer Str. 20, 34355 Staufenberg
Urgent system failures receive prioritized immediate response. General inquiries are answered within 24 hours.