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Yvo de Rooij.
Selected work

Work that had to survive contact with real users.

Two AI products I build and run myself, a company brain built for a client, and advisory work inside large organisations. The products keep the advice honest; the advisory keeps the products grounded. Both are the reason I can tell you what will break before it does.

AI case-interview coachSince 2024

CaseStar

A focused practice room for aspiring consultants: realistic pressure, structured cases, and feedback that arrives while the habit is still fresh.

My role
Founder, architect and builder
Built with
AI agentsVoice UXReactSupabase
What running it taught me: people only trust AI feedback when it is specific, fast, and visibly grounded in what they actually said. That is the bar I hold client systems to.
casestar.ioOpen
CaseStar, AI case-interview coach, as it looks live at casestar.io
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  • 012,000+ users
  • 02Partnerships with top consulting firms
  • 03Live voice coaching loop
AI spend intelligenceSince 2025

Qube

Reads a business's bills, contracts and supplier terms and hands back the lines worth checking, so you can see where you pay more than you should without purchasing expertise. Nothing changes without your approval.

My role
Lead engineer
Built with
LangGraphData pipelinesNext.jsAI analysis
What building it taught me: when AI touches money, it is only as good as the audit trail it leaves and the approval it waits for. Legibility is not a feature; it is the product.
qube.digitalOpen
Qube, AI spend intelligence, as it looks live at qube.digital
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  • 01Spend-cube generation
  • 02Category insight
  • 03Workflow-native AI
Company brain for operationsClient work

Zazi

A company brain for Zazi, the company founded by Jeanne de Kroon: one system that holds how the business runs and automates the operational work around it.

My role
Architect and builder
Client
Zazi, the company founded by Jeanne de Kroon
What it taught me: a company brain only earns trust when it holds how the business actually runs, not how the org chart says it does.
What was built
  1. 01Company brain
  2. 02Operational automation
Outcome

Operational work that used to be done by hand now runs through one system the team can see and adjust.

Advisory & strategy

Inside the organisations where AI has to answer to operations.

Alongside the three cases above, I have worked on strategy and delivery with teams at large organisations, usually in the room where executive ambition meets what the operation can actually absorb.

River, late summerStudy IV

Most of the useful advisory work happens around a table, with the people who will run the system, not in a slide deck.

  • Heathrow

    Strategy and sourcing

    Buy-and-build strategy and tender guidance

    Worked out which capabilities Heathrow should build itself and which it should buy, then guided the tender so the decision still held once suppliers, procurement and the people who would run the result were all in the room. At an airport a build-or-buy call outlives the project that made it, so the reasoning had to be right before it was fast.

    What it shows

    Build-or-buy judgment, running a tender, executive advisory in critical infrastructure

  • Rabobank

    IT project management

    IT project management for the mortgage application system

    Ran the IT project management for Rabobank's mortgage application system: scope, plan, suppliers and stakeholders, in a bank where a mistake in the application process is a customer problem and a regulatory problem at the same time. A mortgage system sits where the bank's revenue meets its regulator, so the discipline of delivery mattered as much as the software.

    What it shows

    Delivery leadership in a regulated bank, stakeholder management, keeping a critical system on track

  • CZ

    Platform enablement

    Set up the low-code platform that enabled development

    Set up the low-code platform at CZ that let teams build and ship their own applications, with the guardrails to do it safely, so development no longer waited on one scarce engineering queue. For a health insurer that is the difference between an idea reaching the business and an idea waiting its turn.

    What it shows

    Platform set-up, enabling teams to build for themselves, governance that makes self-service safe

Also: Shell, Valcon, ING. Details in conversation.

Next step

If it needs to feel like a product, not a prototype, we should talk.

Start a conversationOr email me directly

Replies within one working day. Or email yvoderooij@gmail.com.