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stackschmiede.de
DE
▸ forge.tsok
Custom software · Frankfurt

Own software. Own server. No US cloud.

I bring AI into mid-market companies — tailored to your needs, on your server, not at OpenAI. Alongside that I build websites, apps and rebuild legacy software. AI lets me move faster than classic agencies; the code is yours at the end.

Discuss your project See my work
3
Own projects live
CHATSTACK · CLOUD-EXIT · DICTATESTACK
8
Years of IT practice · full-time since 2025
C#/C++ · SERVER-ADMIN · 4 COMPANIES PRIOR
DE
Server in Germany · no US cloud
ENCRYPTED · NO TRACKING
01 / Services

Ten offerings — five in focus.

See all ten packages
01 Recommended

Local AI for your business

Mistral Small 3.1, Codestral or Voxtral on-prem — mail triage, shift assistant, document RAG, code assistant. Qdrant vector search.

MistralCodestralVoxtralvLLMQdrant
Price
from €4,900
Duration
4–8 weeks
02

Full-Service Web

Design, server, domain, email, maintenance — one hand, one fixed price, one repo.

AstroWorkshop serverMail
Price
from €2,999
Duration
3–5 weeks
03

Workshop Server

My own VPS in Germany. VPS, root, storage, domains — including stacks-panel and monitoring.

VPSRootStorage Boxstacks-panel
Price
from €19/mo
Duration
immediate
1,284ACTIVE USERS
04

Mobile App (iOS + Android)

A branded app from one codebase — connected to your backend or existing API.

FlutterDartiOSAndroid
Price
from €4,900
Duration
6–10 weeks
05

Web Portal / SaaS MVP

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

DjangoPostgresAstroTypeScript
Price
from €6,900
Duration
5–8 weeks
1,284ACTIVE USERS
Preferred engagement from €990/mo · 6 months minimum

Engineering on Retainer

Fixed days per month, direct Slack/email access, predictable spend. 1, 2 or 3 days per month.

See details
02 / Sovereign AI

Your documents. Your model. Your server.

Mistral Small 3.1 and Qdrant on-prem, grounded on your contracts, tickets and wiki articles. No data to OpenAI, no per-query token bills — just your infrastructure.

Mistral Small 3.1QdrantLlamaIndexFastAPIDocker
See AI solutions See live case
neural · forward pass
online
01
Ingest
PDF · MD · SharePoint
02
Chunk
Semantic · 512 tok
03
Embed
BGE-M3 · 1024 dim
04
Retrieve
Hybrid · BM25 + Vec
05
Generate
Mistral · on-prem
rag.jsonl — stream
Live · latent vector space
contracts tickets wiki
< 1.4s
p50 response time
0
data to US cloud
100%
GDPR compliant
02.5 / Data sovereignty

Data sovereignty is an architectural decision.

Why I work solo and run this the way I do — instead of opening yet another agency.

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 about going without — it is about building differently.
See cloud-exit packages → Own stack as reference
03 / Work

Selected work

All projects
2025 · industry Live

ChatStack

own Matrix Messenger with Bridges

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

Matrix SynapseElement WebPostgreSQL 16mautrix bridgesDockerNginx + Let's Encrypt
View project
nawinn@vps: ~/matrix
# self-hosted matrix
docker ps --format "{{.Names}}"
synapse · element · postgres
mautrix-whatsapp · mautrix-signal
✓ 4 bridges up · TLS 1.3
2024 · selbst Live

Cloud-Exit Stack

own photo, drive and mail server
View project
2025 · industry Live

AI chatbot on your own messenger

3motiBot proof
View project
2024 · industry Live

VPS toolkit

the foundation under every project
View project
2026 · selbst Live Beta

DictateStack

dictate, snippets and text polish into any field
View project
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 — Original (October 2024) Nawinn Gutzeit
Nawinn Gutzeit · Born 1984 Portrait AI-upscaled · hover/click for original Original · Samsung S23 Ultra · October 2024
05 / About
I build software the way I’d want to inherit it: documented, traceable, no magic. AI-accelerated development — your solution runs sovereign on your server.
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)