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stackschmiede.de
DE
AI-augmented · EU-hosted · Hand-crafted

Software that stays in Germany.

One engineer with Claude Code as co-pilot. Years of experience from classical application development, returning with modern AI acceleration. Sovereign web solutions for the European mid-market — fair pricing, GDPR-safe.

Discuss your project See my work
Servers in Falkenstein · Response time < 24h on weekdays · Available from Q3/2026
We support Keep Android Open — against Google’s mandatory Android-developer verification from September 2026. Read more
9
4 public prototypes
rolled out GDPR-compliant
4
C#/C++ history + Django/Flutter/Go
Django · Flutter · Go · Astro
100%
100% EU-hosted (Hetzner Falkenstein)
Hetzner · no US-Cloud
01 / Services

Four clear offerings. Honestly priced.

See all packages
USP · Flagship from 5,900 €

Sovereign AI Integration

On-prem LLMs (Llama, Mistral), Qdrant vector search, RAG on your own documents. Inference on your server, not OpenAI’s.

OllamavLLMQdrantLlamaIndex
Business from 9,000 €

Web Portal / SaaS MVP

From domain sketch to shipped product — Django or Node, Postgres, TypeScript frontends.

DjangoPostgresAstroTypeScript
No-Builder from 3,500 €

Hand-crafted Website

Astro + Payload when you need CMS. Loads in < 1 s. GDPR by design.

AstroPayloadTailwind
🌟 Main product from 1,800/mo

Engineering on Retainer

Fixed days per month, direct Slack/email access, predictable spend. 2/3/4-day models.

RetainerMonthly6-month min
02 / Sovereign AI

Your own ChatGPT. On your server.

Most "AI features" are API wrappers: your data flows to OpenAI, your costs flow to AWS, your GDPR compliance becomes someone else’s problem. There is another way. Local-first, fully sovereign, with control over model and data.

US-Cloud → EU / On-Prem
OpenAI / Anthropic → Llama 3.3 or Mistral on your server
Pinecone → Qdrant self-hosted
ChatGPT plugin → RAG over your docs
AWS Bedrock → vLLM on Hetzner GPU
See AI solutions See live case
demo.stackschmiede.de/ausmalbild
Live

Stable Diffusion XL · Line-Art LoRA · Hetzner GPU · text-prompt based

02.5 / Data sovereignty

Data sovereignty is not ideology. It is architecture.

Why I run this workshop — instead of just selling standard web apps.

01 Today

Apps collect what they can get

Geo data, contact networks, payment behaviour, photo content, calendars, even sleep data. Most users don’t know the full scope — and have no tool to reduce it.

02 Tomorrow

AI models decide about us

Insurance rates, credit scores, job pre-screening — increasingly automated on the basis of exactly this app data. Whoever shares today hands over decision power tomorrow.

03 Answer

Own architecture instead of US cloud

We cannot change the system from outside. But we can decide to feed it less — through own photo servers, own drives, own messengers, local AI. Modern, comfortable, EU-hosted.

What I built for myself, I build for you too. Cloud-exit is not abstinence — it is a different architecture.

See cloud-exit packages → Own stack as reference
03 / Work

Selected work

All projects
2025 · bildung Beta

crescendo — Guitar-school Portal

Django portal for guitar teachers and their students: scheduling, practice tasks, learning progress. Currently in tester use, no paying customers yet.

DjangoPostgreSQLTailwind CSSHTMXHetzner
  • Prototype reachable at kreativer-gitarrenunterricht.de/crescendo/
  • Small tester group gives feedback — no production customers yet
  • Task management + practice tracking functional, UX being iterated
2025 · industry

Time-tracking system for small and mid-sized companies

Backend, web dashboard and mobile app (iOS + Android) for legally compliant time tracking. GDPR-compliant, aligned with German working-time law 2026 standards. Custom-branded on request.

GoPostgreSQLFlutter (iOS + Android)
2025 · industry Live

3motiBot — own Matrix Messenger with Bridges

Self-hosted Matrix homeserver (Synapse + Element Web) on Hetzner — with WhatsApp, Signal, Discord and Telegram bridges. A real GDPR alternative to WhatsApp/Slack for SMEs. Branded per client.

Matrix SynapseElement WebPostgreSQL 16
2024 · selbst Live

Cloud-Exit Stack — own photo, drive and mail server

Lived exit from US cloud services: Immich instead of Google Photos, Nextcloud instead of Dropbox, Matrix instead of WhatsApp, own Postfix mailserver instead of Gmail. In daily personal use.

ImmichNextcloudMatrix Synapse
04 / Process

From briefing to product — no agency layers.

  1. 01 Day 1-5

    Kickoff

    Workshop, questions, goals. Scope memo with time and budget. Fixed price or T&M — your call.

  2. 02 Week 1-2

    Prototype

    Clickable prototype or technical spike. Surface risks early, lock in decisions.

  3. 03 Week 2-10

    Build

    Iterative dev, weekly demos, transparent progress. Git repo, CI, preview links.

  4. 04 Final week

    Handover

    Documentation, admin handover, runbook. Optional: managed hosting or retainer.

Nawinn Gutzeit
Nawinn Gutzeit · 2026
05 / About
„I build software the way I’d want to inherit it: documented, traceable, no magic. Claude Code as co-pilot — decades of experience as the foundation.“
Background
Ex application developer
C# · C++ · Schnittstellen
Location
Near Frankfurt · Remote
Languages
Deutsch · English
More about me →
06 / Contact

Let’s talk.

Three channels, one contact. Reply within 24 hours on business days.

  • Phone (on request via email)
    Number shared after a short email pre-clarification.
  • Form
    Right — with project context
Response: < 24h on business days
Data transfer: encrypted (TLS 1.3)
Spam protection: Cloudflare Turnstile (no reCAPTCHA)