New series

Building my AI operating system

A preface and twelve posts, one every three days until 21 November — what I built, what the AI built, what broke, and the patterns I would reuse. In English and German. The whole series →

  1. The stocktake — and the AI that interviewed me

    On 21 March, a month after the move to Obsidian, I wrote a status note titled "OM Restart" (OM for operating model, my name for the AI OS back then). It asked one question: what do I actually have?

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  2. Four inboxes, one vault — and an assistant inside it

    In January my day started with a checklist: clear the OneNote inbox, the OneDrive inbox, Google Drive, iCloud. Four places where notes, receipts and half-finished thoughts landed, all to be visited before I could think about anything else.

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  3. Why I am writing this

    I have spent a long career in IT, designing operating models and running transformations where systems and organisations meet. Since October 2025 I do that independently, with my own small company.

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Kalli's way north

In 2008 a family from Germany packed up and moved north to Finland. Eighteen years, one blog and a good many winters later, this is our corner of the web: the story so far, the places that shaped it, and — for the family — the archive of where we come from.

  1. Story

    My way from the Sauerland via the Rhineland to Helsinki

  2. Places

    The places in the family's geography

  3. Blog

    My blog since May 2008, newest first.

  4. AI OS

    A preface and twelve posts, 19 October to 21 November 2026

  5. Backgrounds

    Favourite travel photos, free to use as a background in video calls.

  6. Sound

    PA hire and live sound for small and medium events in the Helsinki region.

  7. Jobs

    In Finland, Germany or wherever you are looking. A questionnaire, a daily search, tailored CVs and letters, and an assistant to talk to. Free; if it works, invite me to dinner.

  8. Family archive

    The private family archive

    Family only
  1. Story

    My way from the Sauerland via the Rhineland to Helsinki

  2. Places

    The places in the family's geography

  3. Blog

    My blog since May 2008, newest first.

  4. AI OS

    A preface and twelve posts, 19 October to 21 November 2026

  5. Backgrounds

    Favourite travel photos, free to use as a background in video calls.

  6. Sound

    PA hire and live sound for small and medium events in the Helsinki region.

  7. Jobs

    In Finland, Germany or wherever you are looking. A questionnaire, a daily search, tailored CVs and letters, and an assistant to talk to. Free; if it works, invite me to dinner.

  8. Family archive

    The private family archive

    Family only

Who is “Kalli”?

Kalli is what friends have called me — Martin Kallenbach — since my first day at school, and it stuck: on the blog, in e-mail addresses, and now in this domain. Behind it is a blended family: Liisa and me, our children and grandchildren in Finland, Germany and Switzerland, and the relatives on both sides who make the story worth telling.