About Cécile Rouet

I have sat on both sides of the table

Business buyer, innovation buyer, vendor and consultant, inside European investment banks, for 20 years.

Today I help B2B software vendors get every stakeholder who shapes the decision in those banks to commit.

Cécile Rouet, founder of 3WHYse

What 20 years inside the banks taught me

For two decades I worked inside major investment banks across business, risk, operations, COO functions, change and innovation. I sat in every committee and worked with every team, from operational profiles to group executives.

I learnt that decisions are shaped as much by influence dynamics as by individual incentives. Winning over operational teams was hard enough; getting senior decision-makers to commit was harder still.

I saw how senior executives actually decide, in formal and informal settings, and learnt how to reach the people who truly move a deal.

Two things became clear

  • You don't sell to a bank. You sell to people inside the bank.
  • Stakeholders buy when the case, the organisation and their own motivations line up.

One market, seen from three angles

I have bought, assessed and sold technology inside European investment banks. I know how your proposition is evaluated once you leave the room.

The business buyer

I ran RFI and RFP processes from the client side. I designed target operating models and platform rollouts across front, middle and back office, including risk and accounting, and led the front-to-back outsourcing of an equity derivatives business.

The innovation buyer

At BNP Paribas CIB, I connected clients, internal teams and FinTechs. I advised senior leadership on build, partner or buy decisions and secured business, IT, legal and compliance sign-off for start-up partnerships.

The vendor

I ran RFI and RFP processes from the vendor side. I sharpened early-stage FinTechs' pitch and account approach using direct client insight, and accelerated their sales. Since 2022 I have worked with B2B tech start-ups on product-market fit and enterprise sales.

Getting every stakeholder to sign off was the job

Close to the people who decide

I’ve worked closely with senior stakeholders and executives. I have seen how they actually make their decisions, in both formal and informal settings, learning how to connect with those who truly decide.

Inside the politics

I have operated in highly political, multi-stakeholder environments, working with the underlying influence dynamics required to build consensus and move initiatives forward fast.

Every committee, every level

Across all of this, I’ve sat in every committee, worked with every team and collaborated with everyone, persuading every level from operational teams to group executives.

Why I built the 3WHY™ Decision Method

As a junior consultant, I was shown the iceberg that explains decisions in large organisations: visible and rational, hidden and political, deep and emotional. Nobody showed me how to work with it.

I had to learn to engage, influence and persuade stakeholders at every level, top management, middle management and front line, without authority over them. With speed and precision, because the deadlines didn't move.

The 3WHY™ Decision Method makes that know-how explicit, and teachable to a sales team.

What it is built on

  • First-hand experience of how European investment banks buy.
  • Established sales methodologies, specialised for finance.
  • The way people actually work in Global Markets and around it.
  • Skills rarely found in a banking career: user research, co-design and software sales.

Career

  1. 2025 to dateFounder, 3WHYse. Sales methodology for teams selling software to European investment banks.
  2. 2022 to 2025Early-stage B2B tech start-ups. Product-market fit and enterprise sales.
  3. 2018 to 2022BNP Paribas CIB, innovation with start-ups. FinTech co-creation and start-up sales enablement.
  4. 2015 to 2017BNP Paribas CIB, Global Markets. Head of the Front-Office to Finance project team.
  5. 2014 to 2015BNP Paribas CIB, Equity Derivatives. Lead for the RBS portfolio and client franchise transfer.
  6. 2010 to 2014Crédit Agricole CIB, Global Equity and Fund Derivatives. New business development and COO delegate.
  7. 2003 to 2010Atos Consulting and Investance. Transformation programmes for financial institutions; RFI and RFP processes from client and vendor side.
  8. 2001 to 2003Société Générale. Trading assistant in exotic interest rate and FX derivatives; bonds back office.

Bring one stalled deal

A 30-minute call on one deal that should be moving and isn't. You'll see how I read it: the case, the organisation and the person who has to decide.