Souverain Systems IT · infrastructure · AI · Potsdam
DE

Stiebitz Souverain Systems UG (haftungsbeschränkt)Potsdam, Germany · Sans souci, with your own server.

IT that belongs to you.

You break the chains of digital dependence; I build what holds afterwards: your own servers for files, receipts, passwords and backups, documented and handed over.

Request a first conversation free of charge, reply by email

Next: what you get Sample server: 7 of 7 parts checked, last check 04 s ago

Handover record

Keys included.

Every client gets their own server in Germany. The rack shows the seven parts I set up, check and hand over to you.

7 of 7 handed over

At the end I hand over a description of the whole setup, written so that someone else could take over.

This is the sample setup, not the system of any particular client. Real screen, made-up data: captured on a sample server, and the joinery Tischlerei Beispiel does not exist.

  1. 01 Files and OfficeNextcloud, Collabora before: a different version on every device after: your own server, DE checked
  2. 02 PaperworkPaperless-ngx before: paper in binders, scans somewhere in the inbox after: searchable, on your server checked
  3. 03 PasswordsVaultwarden before: one password for everything, on a sticky note after: vault, you hold the keys checked
  4. 04 Mailyour domain before: one inbox for all, forwarded to personal accounts after: addresses on your domain checked
  5. 05 Backupencrypted, off-site before: a hard drive in a drawer, never restored after: restore tested restored
  6. 06 Monitoringwith alerts before: you hear about outages from whoever calls first after: last check 12 s ago running
  7. 07 Accessyour own VPN before: remote access open to the internet after: admin access only via VPN checked
One server per client, hosted in GermanyOpen source
01

Files and OfficeNextcloud, Collabora

Sovereign systems adjust. To you.

German-language Nextcloud file list with the folders Quotes, Orders, Accounting, Team and Templates, stock
The same view in your colours: name Souverain Systems, stamp blue, Inter Tight typeface
Nextcloud: your files in the browser, folders as usual, only they live on your own server.
A quote from the fictitious joinery, opened in Collabora in the browser
Collabora, the word processor inside Nextcloud: a quote written in the browser, no Microsoft needed.

Sample server · made-up data
02

PaperworkPaperless-ngx

Sovereign systems adjust. To you.

German-language Paperless-ngx with three documents: delivery note, invoice, maintenance contract, each with sender, type and tags, stock
The same view in your colours: name Souverain Systems, stamp blue, Inter Tight typeface
Paperless: three documents, sender, type and tags assigned automatically, searchable in full text.

Sample server · made-up data
03

PasswordsVaultwarden

Sovereign systems adjust. To you.

German-language Vaultwarden vault with entries in the folders Bank, Office, Suppliers and Workshop, stock
The same view in your colours: name Souverain Systems, stamp blue, Inter Tight typeface
Vaultwarden: passwords in a vault instead of stuck to the monitor, sorted into Office, Workshop, Bank and Suppliers.
An opened entry named “Router Praxis” with the password hidden, stock
The same view in your colours: name Souverain Systems, stamp blue, Inter Tight typeface
One entry: password hidden, copy with one click.

Sample server · made-up data
05

Backupencrypted, off-site

$ restic restore latest --target /srv/probe
restoring snapshot b991469e of [/srv/daten] at 2026-10-27 08:25:58.895910039 +0000 UTC by root@musterserver to /srv/probe
Summary: Restored 11 files/dirs (808.210 KiB) in 0:00
$ diff -r /srv/daten /srv/probe/srv/daten && echo identisch
identisch
$ restic check
using temporary cache in /tmp/restic-check-cache-3544647142
create exclusive lock for repository
load indexes
check all packs
check snapshots, trees and blobs
[0:00] 100.00%  1 / 1 snapshots
no errors were found
A backup only counts once the restore works: restic restores, compares, finds no errors.

Sample server · made-up data
06

Monitoringwith alerts

Sovereign systems adjust. To you.

Uptime Kuma status page: all services green, four red bars from a short outage on the document archive, stock
The same view in your colours: name Souverain Systems, stamp blue, Inter Tight typeface
Uptime Kuma: all services green, only a short outage of the document archive still shows as a red bar.

Sample server · made-up data

Services and guide prices

Seven areas, each with guide prices for orientation. What exactly it comes to in your case, we settle in the first conversation.

Limited places per quarter, because I work alone and want to keep things predictable.

How I work

Five principles that apply to every job, whether practice, club or business.

  1. § 1applies

    Your data stays with you

    Your own server or your own hardware instead of an account with a platform that you can never get rid of later.

  2. § 2applies

    Open source as the default

    Software with open source code that you can keep running, even without me.

  3. § 3applies

    Documented and transferable

    Every system gets a description that lets someone else take it over.

  4. § 4applies

    Tested, not claimed

    A backup only counts once it has been restored. A finding only counts once it is backed by evidence.

  5. § 5applies

    Clear prices

    The guide prices are published, the initial conversation costs nothing, and I itemise server and licence costs openly.

André Stiebitz, portrait in black and white

Managing director

André Stiebitz

I am André Stiebitz, managing director of Stiebitz Souverain Systems UG in Potsdam, and I work alone. I have been self-employed since 2012, first as a photographer; for IT I hold the CompTIA A+, Network+ and Security+ certifications. I build my own tools as open source and with AI assistance, and I say so. The person working on your server is me, and so is the person who explains it to you.

Register, certifications and open code