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// ← EVERY SEATRISK · COMPLIANCE · AUDIT

Model Validator

Independently checks that the bank's models do what they claim, before anyone relies on them.

// 01 — THE WORK

The work is adversarial by design: reproduce the model, test it on data it has not seen, probe where its assumptions break, and write the limitations down in a way that survives a regulator reading it. Credit, capital, pricing, provisioning and increasingly machine-learning models all pass through here.

// 02 — WHO ARRIVES HERE

Statistics, mathematics, actuarial and data science backgrounds, and analysts moving across from credit risk or finance.

// 03 — WHAT THE INTERVIEW ASKS

These are the shapes the round takes, not a question bank — banks phrase them differently and the wording is never the point.

  1. 01How would you test a model whose developer says it works?
  2. 02What does this model assume that the world may not?
  3. 03The model is accurate overall and wrong for one segment. What do you do?
  4. 04How would you explain a limitation to someone who wants to use the model anyway?
  5. 05When is a simpler model the right answer?
  6. 06What would make you refuse to approve one?

What the panel is listening for. Independence with evidence — a validator who cannot say precisely what is wrong is as unhelpful as one who signs everything.

// 04 — WHY CREDIT PAYS IN THIS SEAT

A credit model is a claim about how borrowers behave; you cannot judge whether the claim is reasonable without knowing what a real file looks like, which is why validators who understand lending are the ones who get listened to.

That is the general case as well as this one. A bank's technology is not ordinary technology and its finance is not ordinary finance, and the second and third lines of defence — risk, compliance, financial crime, model validation and internal audit — recruit heavily out of the functions, taking the people who can already read a business. The case drills are free and are the cheapest way to build that, whichever column you sit in.

// ALSO IN RISK · COMPLIANCE · AUDIT

The whole board, and how the four blocks fit together, is on what jobs banks hire for.