Stefan Ostermann

Private AI

Open models on your own hardware, so the data stays with you

  • In your server room or with a German operator.
  • Audit, hardware, model selection and stack from one place.
  • At the end your own people run the system.

Frontier AI from OpenAI or Anthropic means everything your staff type leaves the building on the way to an answer. With contracts, personnel files, customer data and sometimes even source code, that is often not what you want. I run open models on my own hardware and set up the same for you: audit, hardware, models, software, until your people can operate it themselves.

01 — Why in your own house

Sovereignty first. But cost can matter too.

The data sits in your own server room or with a German operator you have your own contract with. Nobody changes your terms overnight, and nobody retires the model you built a process around. Per-seat subscriptions are cheap for as long as the providers do not have to earn money. I would not assume that lasts.

It is not cheaper on day one. A capable machine for local AI is expensive, and whether it pays off depends on how hard it is used. That is what the audit is for.

02 — The audit

Before you buy any hardware.

We go through the work you want to hand to AI and sort it: what a local model handles well, what is worth sending to a large cloud model, and what needs no AI at all, just decent search. You get a written recommendation: which machine is enough for it, and which work it takes off your hands. And if renting is the better choice at your volume, it says so.

03 — The hardware

Sized from the workload.

The model decides how much graphics memory you need, and memory is the biggest cost item. I specify the hardware, tell you what it costs, and go through procurement with you. Whether it stands on a desk, in your own server room or in a rented German data centre is mostly a question of who looks after power, cooling and physical access.

04 — The models

Chosen for your material.

Gemma, Qwen and GLM differ more in practice than their benchmark scores suggest. That is especially true for German text and for documents written the way yours are. I test the candidates on your own material and show you where it gets rough. You get a shortlist with numbers behind it, and a test you can repeat in six months when the next model appears.

05 — The stack

What turns a model into something people use.

The model itself is quickly set up. Most of the work goes into the inference server, the interface your colleagues open, access to your documents, user accounts, the agents that handle recurring jobs, and the integration with what you already run. I build on established open source throughout, with logging and access rights in place from the start, so your team can take it over.

06 — Handover

A running system your people can operate.

Done means it runs, the setup is documented, and whoever is responsible knows how to update a model and what to do when a card fails. If you want me to keep an eye on it afterwards, ask me.