Sebastien Rousseau

Work with me

Research collaboration on payments and quantum-safe security.

Research collaboration means working together on a paper, a working-group output or a technical review in payments, ISO 20022, post-quantum cryptography or applied AI. It suits industry bodies, banks, fintechs and academic teams that want a practitioner's view. You get a co-author, a reviewer or a working-group contributor, with the EPAA white paper as the reference.

These are personal activities, separate from my role at HSBC. The views I share are my own.

Who it's for

Who it's for

Banks

Payments, security and architecture teams preparing a position paper or an internal review on quantum-safe migration or ISO 20022, who want a reader who has built payments products and the open-source tools around them.

Fintechs and payment service providers

Teams publishing research on payment rails, open banking or agentic payments, who want a co-author or reviewer from the bank side of the table.

Regulators and industry bodies

Working groups and associations drafting guidance or white papers, who want a contributor with hands-on payments and post-quantum cryptography experience.

What you get

What you get

Co-authoring. A section or a full paper on a topic in my focus areas, written in plain English with every claim sourced.

Draft review. A structured review of your draft: what holds, what needs a source, and where a payments practitioner would push back.

Working-group contributions. Regular participation in a working group, as with the EPAA Quantum-Safe Cryptography Working Group.

Open data and code. Where it helps the paper, the open-source libraries and datasets I maintain can be cited, inspected and reused.

How it works

How it works

  1. Send a short note through the contact form with the topic, the output you have in mind and the timeline.
  2. We agree the scope, the credit and the publication terms in writing before any work starts.
  3. I contribute to the agreed drafts until the paper or output is published.

Proof

On the record

  • Member of the EPAA Quantum-Safe Cryptography Working Group and contributor to its white paper Quantum-Safe Payments: Why the Payments Industry Must Act Now (September 2025).
  • Fellow of the Institution of Analysts and Programmers (FIAP).
  • 53M all-time downloads of the open-source packages (crates.io, PyPI and npm).

FAQ

Questions and answers

What topics do you cover?

ISO 20022, SWIFT gpi, SEPA Instant Payments, Open Banking, cross-border payment rails, post-quantum cryptography and agentic AI in banking.

Can you co-author in French?

Yes. I write in English and French, both at native level.

How is a contribution credited?

As we agree in writing before work starts, usually as a named contributor, as on the EPAA white paper.

Does this involve HSBC?

No. Research collaboration is a personal activity, separate from my role at HSBC, and the views are my own.

How do I start?

Use the contact form and choose "White paper / research collaboration". The typical first response is within 48 hours.