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Production AI systems · Funded DACH startups

Measured. Not vibes.

Johannes Frey
Johannes Frey

Hi, I am Johannes.

I make AI features production-ready for funded DACH startups: evals, retrieval, and cost control. Hands-on in your codebase, with numbers instead of guesswork.

Expertise

Production beyond the model.

Three focused capabilities I can own with your team.

01 / Measure

Evals and observability

Eval harnesses, RAGAS, Langfuse, production traces, and quality baselines.

02 / Ground

Retrieval and agents

Messy German-language data, RAG, orchestration, tools, and MCP integrations.

03 / Operate

Cost and reliability

Inference economics and the unglamorous production wrapper around everything.

Selected experience
STIHL·MediaMarktSaturn·Porsche
From the blog

Latest notes.

What I built, what broke, the numbers, and the fix.

Start a conversation

You shipped the feature. Now let us prove it works.

Best fit: a funded DACH company under 200 people where the problem owner can sign the contract.

Book a technical fit call ↗