Secure by default
Firewall, SSH keys, TLS and updates from day one.
08 / 08 — Services
Servers & Infrastructure
In short
The best application is worthless on an insecure server. We set up Linux and Windows servers, harden them, automate deployments and backups and monitor operations — for web applications, databases, AI inference and telephony.
01
How it works.
The typical data flow — from input to result. Every station is replaceable and adapted to your systems.
- 01Server (Linux/Win)
- 02Hardening & TLS
- 03Containers
- 04Monitoring
- 05Backup & restore
02
What we deliver
Linux and Windows servers, securely configured and reliably operated.
- 01Linux servers (Ubuntu, CentOS) and Windows Server
- 02Hardening: firewall, SSH, TLS, updates, permission concepts
- 03Web servers, reverse proxies and container deployments
- 04GPU servers for local AI models
- 05Backups, restore tests and monitoring
- 06Documentation and hand-over to your IT
03
A look at the code.
This is what an excerpt from a typical project looks like — readable, commented and without magic. That is exactly how we hand code over to your team.
# Basis-Härtung für einen neuen Ubuntu-Server
$ ufw default deny incoming && ufw allow 22,80,443/tcp && ufw enable
$ sed -i 's/^#\?PasswordAuthentication .*/PasswordAuthentication no/' /etc/ssh/sshd_config
$ apt install -y unattended-upgrades fail2ban && systemctl enable --now fail2ban
$ certbot --nginx -d app.example.de --redirect --hsts
$ restic backup /srv --tag nightly && restic check # Backup nur mit Restore-Test04
What you get out of it.
Automated
Reproducible deployments with rollback.
Monitored
Problems are reported before users notice.
Recoverable
Backups that are tested regularly.
05
Typical scenarios
08.1
Migration
From legacy hosting to a clean, documented server environment — with no downtime.
08.2
AI server
An in-house GPU machine that serves your local language model securely.
08.3
Security review
Open ports, outdated packages, weak configuration — found and fixed.
08.4
Automated deployments
New versions go live at the push of a button, with rollback.
06
Matching solutions.
S1 
Company knowledge assistant
A chat assistant with RAG over all approved sources, per-document permission checks and answers with citations.
- Answers with evidence
- Permissions preserved
- Runs locally or in the EU
S6 
Private in-house AI platform
A GPU server with local language models, internal chat interface, user management, logging and an API for your own tools.
- Company data stays in-house
- Predictable cost
- One interface for everyone
07
Frequently asked questions
Linux or Windows Server?
For web applications, AI inference and telephony Linux is usually first choice. Windows Server makes sense when your software or MSSQL environment requires it. We support both.
Do you handle maintenance and updates?
Yes, with fixed maintenance windows, monitoring and documented changes.
Can local AI models run on our existing server?
We check memory, graphics card and load. Existing hardware often suffices for smaller models; otherwise we recommend a targeted upgrade.
More services
01 / 08
AI Agents & RAG
LLM applications that work with your data and complete tasks on their own.
02 / 08
Local AI Models
Language models on your own hardware — data-sovereign, no cloud dependency.
03 / 08
AI Automation
Business processes that run themselves — with intelligent assistants and integrations.
Ready when you are
Let’s talk.
Describe your project in a few sentences — you’ll get an honest assessment of feasibility, effort and the way forward.
- info@quell-code.com
- Phone
- Call-back on request
- Response time
- usually 2 working days
- Languages
- Deutsch · English · Türkçe