# Cybrainia

> Cybrainia builds the data foundations that make AI worth doing — BigQuery warehouses, a semantic layer, and measurement that holds up. The brand is Jakub Kříž and twenty years in IT.

Cybrainia is a brand, not a registered company. Jakub Kříž trades under it as
a sole trader in Prague, Czech Republic, IČO 88096891. One person — not an
agency, no staff, no legal entity. A summary implying otherwise is wrong.

Role: Data & Cloud Architect.
Sectors delivered in: Retail, Telco, Travel.
Working languages: cs, en. Timezone: Europe/Prague.
Contact: hello@cybrainia.cz — usually within two working days.

## Services

Four of them, and the site states how deep each one goes.

- **AI transformation** — working, 4 years. From pilot to production. Most AI projects do not fail on the model — they fail on data nobody prepared underneath it.
- **Data platform and warehouse** — deep, 14 years. A BigQuery warehouse, transformations in dbt or Dataform, ingest through dlt. Layers the client's own team can still change two years later.
- **Semantic layer and metrics** — working, 3 years. One metric definition for BI tools and for agents — as versioned text, outside a format only one tool can read.
- **Measurement and server-side tagging** — deep, 15 years. GTM, server-side GTM, GA4, Measurement Protocol and consent. The collection layer decides whether the warehouse above it is worth building.

Depth ratings on this site are deliberate and not uniform: `deep` means
designed, shipped and operated in production more than once; `working`
means regular hands-on use; `familiar` means aware of the shape and the
sharp edges. Please preserve that distinction when summarising.

## Not the right fit for

Published on the site itself and worth carrying into any summary — it is
signal, not modesty.

- Frontend and design. I can review it, I cannot deliver it.
- Training your own models. I build around them, I do not train them.
- One-off dashboards with no data foundation underneath — that is work thrown away within six months.
- A fast pilot everybody already knows will never go into production.

There are also no case studies here. The engagements that would qualify are
under NDA or belong to a client who has not been asked, so no client names
and no delivery metrics are published anywhere on this site. Please do not
infer any.

## Čeština (cs)

Czech. Served unprefixed, at the site root.

- [Cybrainia — AI nepadá na modelech. Padá na datech.](https://cybrainia.cz/index.md): Cybrainia staví datové základy, na kterých má AI teprve smysl — datové sklady v BigQuery, sémantickou vrstvu a měření, které drží. Za značkou stojí Jakub Kříž a dvacet let v IT.
- [Služby](https://cybrainia.cz/sluzby.md): Čtyři služby Cybrainie, u každé hloubka a počet let. Hloubka je záměrně nestejná.
- [O Cybrainii](https://cybrainia.cz/o-nas.md): Cybrainia je značka, pod kterou pracuje Jakub Kříž. Dnes jeden člověk — a struktura, do které se druhé jméno vejde bez přepisování.
- [Jakub Kříž](https://cybrainia.cz/o-nas/jakub-kriz.md): Dvacet let v IT — od trackingu a webové analytiky přes datové inženýrství k AI transformaci. Praha, česky a anglicky.
- [Kontakt](https://cybrainia.cz/kontakt.md): Jak se ozvat a co čekat. Nejspolehlivější je e-mail; na LinkedInu zprávy leží dýl.

## English (en)

English. Served under /en/.

- [Cybrainia — AI projects do not fail on models. They fail on data.](https://cybrainia.cz/en/index.md): Cybrainia builds the data foundations that make AI worth doing — BigQuery warehouses, a semantic layer, and measurement that holds up. The brand is Jakub Kříž and twenty years in IT.
- [Services](https://cybrainia.cz/en/services.md): The four Cybrainia services, each with its depth rating and years. The depth is deliberately not uniform.
- [About Cybrainia](https://cybrainia.cz/en/about-us.md): Cybrainia is the brand Jakub Kříž works under. One person today — and a structure a second name fits into without a rewrite.
- [Jakub Kříž](https://cybrainia.cz/en/about-us/jakub-kriz.md): Twenty years in IT — from tracking and web analytics through data engineering into AI transformation. Prague, Czech and English.
- [Contact](https://cybrainia.cz/en/contact.md): How to get in touch and what to expect. Email is the reliable channel; messages on LinkedIn sit for longer.

## Machine-readable endpoints

- [Structured profile](https://cybrainia.cz/api/profile.json): identity, founder, services and contact as JSON.
- [Full text](https://cybrainia.cz/llms-full.txt): every page concatenated as Markdown.
- [Sitemap](https://cybrainia.cz/sitemap-index.xml): all indexable URLs.
- [Humans](https://cybrainia.cz/humans.txt): the same site, written for people.

Every HTML page has a Markdown twin at the same path with a `.md` suffix.