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001 — Was hier gebaut wird

Software and platformsthat go liveand stay live

From the business-critical platform to the web or iOS app: bringing a venture to a decision, building it, handing it into operation — as accountability for a fixed period or as a commission. AI-assisted building is part of the work today.

BUILTLEDORCHESTRATED
Years in IT25+
Markets15+
Products17+
Languages5+
002 — Platforms, products, web. One contract, one steady contact, a team behind it.

I build things myself, which is why I know when a concept breaks against the reality of delivery.

Leon Köllerwirth

Portrait of Leon Köllerwirth
003 — Built, operated, live

Built, operated, live

razbiram.com is the largest piece of work of my own: a complete learning platform, built by me and in operation on the web. Alongside it, two further ventures, each with a different role. Technical detail lives on the product page.

01Live

razbiram.com

A complete learning platform on its own foundation, live on the web: for Bulgarian, for English-speaking medical students and other learners. The native iOS app is in preparation; Critique Incognito, a separate app of mine, already carries that iOS practice into the App Store. Shows agentic content pipelines, evaluation against golden sets and live operation.

View live
02Own venture

StudyWithMe

An institutional, curriculum-grounded learning platform in development: personalised learning paths, source provenance, knowledge linking, traceable didactic reasoning. A platform case, not a finished client reference.

03iOS, on the App Store

Critique Incognito

An independent native iOS app, not part of Razbiram. Evidence-first product design, local data storage, optional AI use with human confirmation, shipped through the App Store.

Go to the product page

What you can commission

Four services, one way of working. What gets built goes into operation and stays there, it belongs to you, and it runs through the same chain of checks — whether it is an enterprise platform or a small shop's presence.

  • Interim management

    Positioning the offer and the product, plus accountability for a fixed period: chief product owner, head of engineering, enterprise architect. For companies and for small businesses — the scale differs, the questions do not.

    View the offering
  • Product and platform development

    Business-critical platforms from the decision through to operations: what gets built, how it is cut, and what has to be evidenced before anyone signs the release.

    View the offering
  • Web app development

    Applications with sign-in, a database and their own logic: booking, loyalty cards, an internal area, connections to what you already use. Plus websites, from a single page to a multilingual presence.

    View web and apps
  • App development

    Apps for iOS and Android — from one codebase with React Native, or natively in Swift, depending on what the venture needs. Critique Incognito is in the App Store and shows what that looks like.

    View web and apps

How we work

From the decision to the delivery

First the business problem, then the decision about what gets built at all. Architecture, organisation and approval follow. The order holds, because each step is what makes the next one possible.

Product & scope

What gets built is decided before the first line of code: make-or-buy, scope and priorities. After that it ships rather than being designed further.

Enterprise Architecture

Target states, platform boundaries and dependencies connect strategy with a system landscape that holds.

Operating Model

Roles, teams, portfolio decisions and adoption turn architecture into an organisation that can work.

Governance & approval

Decision rights, risk, data and accountability are settled before a solution scales.

Ways to work together

The entry point is the same for all four services: a 20-minute introductory call in which it becomes clear which form fits. What follows depends on that — sometimes a worked-out assessment, sometimes a build straight away, sometimes accountability for a fixed period.

The worked-out format

Executive Product & Platform Assessment

In 10 working days, from a real product or workflow question to a go/no-go basis for deciding. One prioritised venture, a clear scope, a fixed price.

10 working days · fixed price from €8,500 net

See the offering in detail
  • Guided Instrument Review

    Apply an existing instrument to a concrete problem together: the application facilitated, the result interpreted.

  • Pilot, release readiness, operating model

    Product design and agentic architecture, control model and release gates, or organisation and interim accountability. Whichever it is that has you stuck.

AI Opportunity Signal

Describe operational friction, paste your website or upload context, and receive a first signal on where automation might find traction.

  • a first view of the suspected problem category
  • operational friction hypotheses (explicitly marked as hypotheses)
  • a rough maturity level and an indication on whether a deeper investigation is warranted

The reference stack

Six open instruments along the path a venture actually takes. Published so they can be used.

  1. DecidePlatform Decision KitDecide step of the lifecycle, 1/6
  2. BuildLocal Agent PipelineBuild step of the lifecycle, 2/6
  3. ControlAgentic AI Governance ToolkitControl step of the lifecycle, 3/6
  4. ApproveRAG Approval BlueprintApprove step of the lifecycle, 4/6
  5. RevalidateLegal status recordRevalidate step of the lifecycle, 5/6
  6. ExplainApproval teaching caseExplain step of the lifecycle, 6/6

Four of them are open as a repository: read it, clone it, run it in-house. Two run as a page here — the teaching case is the text itself, the legal-status record is the operable register. And each one can be applied with support, when interpreting the result is the actual work.

See Fieldwork in detail

Selected companies and engagements

Daimler Mobility
SMA Solar
Tönnies
Saturious
Gehring Partner

Former employers and engagements, not presented as current partnerships or client relationships.

FAQ

Questions that come up before a call

Engagements across Europe, in German and English, hybrid or remote.

contact@leon-koellerwirth.com

AI transformation & governance

Within 10 working days: two executive interviews, the analysis of one prioritised critical workflow, an opportunity and friction model, an economic hypothesis as a value-effort frame, a Pilot Decision Frame, and a decision document of 10–15 pages. Regulatory framework questions are identified and named, not legally assessed. Not included: revision loops, additional interviews, further workflows, architecture deep-dives and implementation work. All of these are available as change requests. Payment is 50 % on engagement and 50 % on delivery of the document.

The fixed price starts at 8,500 EUR net and depends on the scope of the selected workflow. A binding proposal follows a 20-minute introductory call. Payment is split evenly between engagement and delivery of the decision document — the price is fixed beforehand, not billed by effort.

The German KI-MIG has been in force since 29 July 2026 and the AI Regulation broadly applies since 2 August 2026; the Bundesnetzagentur becomes the central market surveillance and coordination body, while sectoral and state competences remain in place alongside it. For financial entities — in particular CRR institutions and Solvency II insurers — BaFin published explicitly non-binding guidance on 18 December 2025 covering ICT risks in AI deployment under DORA, across the full lifecycle from data acquisition to retirement. The assessment names these framework obligations as context for the leadership team; it does not assess them legally. That belongs with your legal department or a law firm. At Daimler Mobility I was Senior IT Manager for Enterprise Architecture & Information Security (11/2016–10/2020) in a BaFin-regulated financial environment; from 2019 as Lead Information Security Officer (ISB), accountable for the ISO team and for MaRisk, BAIT, ISMS and ISO 27001 governance, as part of the global cyber security team.

A fractional CTO carries ongoing operational leadership at several days per week, which is right when a role has to be permanently staffed. The entry point here is built differently: a sharply bounded diagnostic assessment with a fixed price, a fixed duration and a document that stays in the company. Pilot design, transformation mandates and — where the need is concrete — interim leadership responsibility can follow from it. The difference is not availability but sequence: a defensible basis for the decision first, commitment second.

Engineering leadership & embedded products

The embedded experience starts at Tönnies Fleischwerk (2004–11/2016, first as a software engineer, from 2006 Head of Engineering & IT Development), a food group with seven production sites. There, over several years, I implemented machine control and warehouse-logistics processes myself – in C, part of the control on single-board computers, with JNI interfaces to the Java systems. The level of accountability followed at SMA Solar. Almost four years of interim responsibility (02/2022–12/2025) for product management, engineering organisation and the architecture of a business-critical embedded software platform for inverters and energy management, three products and around 30 features taken to market readiness across multiple interdisciplinary embedded product teams. Introduced and anchored SAFe, built microservices-oriented domain teams, and established the company-wide architecture platform ArCo with architecture principles, decision processes and governance. In between, Senior IT Manager for Enterprise Architecture & Information Security at Daimler Mobility (11/2016–10/2020).

Both are possible, and the SMA engagement was the operational case: not an advisory position but interim responsibility for product management, engineering organisation and system architecture across several teams, including roadmap, backlog, releases, dependencies and priorities. Which form fits — mandate, advisory or interim leadership — is settled in the 20-minute introductory call.

Structures that keep working without me. At SMA Solar those were the company-wide architecture platform ArCo with its principles, decision processes, documentation and governance; SAFe anchored organisationally rather than taught in a workshop; microservices-oriented domain teams; and end-to-end Jira and Confluence processes for portfolio management, architecture and software development. In the assessment it is the decision document, which stays in the company and can be argued with in my absence. An engagement that only works while the external person is present has missed its purpose.

Because the gap between AI strategy and usable AI implementation almost always sits in the same place: missing experience with the actual engineering operation. I combine three layers: built it myself (embedded platforms, system architecture, today agentic AI systems), then led it (engineering organisations and product accountability at interim leadership level), now orchestrate it (AI governance, transformation mandates). That turns an AI initiative from a tooling question into an architecture and organisation question. That is where it is decided whether it ever leaves pilot status.

Platforms, products, web. One contract, one steady contact, a team behind it.

Next step

Are you building a business-critical platform? Or are you looking for someone to lead it, and the organisation behind it?

A confidential conversation clarifies whether the business problem, accountability frame and execution path fit together. That holds for engagements and advisory as much as for interim responsibility and permanent leadership roles. Which form of collaboration fits is something we clarify there.

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What the motion means

Noise first, then a beat

Everything begins as noise: a knot in which nothing yet knows where it belongs. Reading to the right, it finds its order, until a core stands and it goes quiet. Quiet, not dead. Order is motion that has found its measure.

One red signal, down and across, one beat. Across is time: going live is a moment, staying live is a line. As long as it keeps its beat, the system is alive.