Sebastien Rousseau is a senior banking technologist with 20+ years across HSBC, PayPal and Barclays. He turns payments modernisation, post-quantum cryptography and applied AI from policy paper into inspectable code, and into keynotes a board can act on.
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Shipped payments at HSBC, PayPal & Barclays · Co-author, EPA quantum-safe white paper · Contributor, Emerging Payments Association Asia
Contributor to the EPAA Quantum-Safe Cryptography Working Group. Co-author of the EPA white paper "Quantum-Safe Payments: Why the Payments Industry Must Act Now" (September 2025).
Boards and conferences need someone who can hold a room. Newsrooms need someone who can give a clean, accurate quote on deadline. I do both.
Keynotes, panels and workshops for boards, conferences and executive teams navigating payments, post-quantum and AI.
Broadcast-ready commentary on payments, post-quantum cryptography and applied AI, for print, radio, TV and podcasts.
Each talk turns a live industry problem into a decision a room can act on. Every one is tagged for the audience it is written for, and can be tailored to yours.
What the November 2026 SWIFT cutover, FIPS 203, and harvest-now-decrypt-later mean for a Tier-1 payments stack, and how to turn migration into a measurable, board-grade engineering programme.
You leave with: a board-ready migration roadmap and the metrics to govern it.
A field guide to building production-grade ISO 20022 automation: structured-address compliance, BAH/head.001 wrapping, BIC/IBAN/LEI checksums, and OpenTelemetry UETR tracing.
You leave with: a concrete engineering checklist for the address deadline.
Why open-source reference implementations beat proprietary black boxes for security, compliance, and supplier risk under DORA, and how to govern them inside a regulated institution.
You leave with: a supplier-risk framework for open-source in production.
Translating cryptographic agility from a project paper into a board-level operational-resilience commitment, using the EPAA framework, NIST PQC standards, and a concrete migration roadmap.
You leave with: the language to brief a board on cryptographic risk.
The five-component control plane that turns autonomous workflows into SR 11-7 / SS1/23 supervisory-ready evidence: OAuth-scoped accounts, deterministic routing, OPA policy gates, immutable WORM audit logs, and a tested kill switch.
You leave with: a control plane your model-risk team can actually sign off.
Every keynote can be re-cut for your institution, your regulators and your migration timeline.
Discuss a custom talk →A single, tightly-argued talk built around one decision your audience has to make. Tailored to your stack and regulators.
Moderated or contributing. I bring the technical detail that keeps a panel honest and the plain English that keeps it useful.
Hands-on, board-to-engineering. We leave with an artefact: a roadmap, a checklist, or a reference implementation.
Broadcast-ready commentary on payments, post-quantum cryptography and applied AI. I give plain-English quotes for a general audience, or go as deep as your specialist desk needs.
Sebastien Rousseau is a senior banking technologist focused on the structural transformation of wholesale payments. Across HSBC Commercial & Investment Bank, PayPal, Barclays, Shazam, AKQA, and Virgin Group, he has shipped payment platforms, AI products, and open-source infrastructure used in production by treasury and payments teams. He authors and maintains pacs.008, pain.001, BankStatementParser, KyberLib, CloudCDN, and dotfiles, each positioned as a reference implementation, not a demo: inspectable, board-grade financial infrastructure.
He contributes to the Emerging Payments Association Asia Quantum-Safe Cryptography Working Group, co-authored the EPA white paper "Quantum-Safe Payments: Why the Payments Industry Must Act Now" (September 2025), and publishes Banking On Quantum and Banking On AI. He works at the intersection of agentic AI, real-time payments, post-quantum cryptography, cloud-native resilience, structured data, and regulatory evidence.
Copy-paste, pre-approved, in three lengths. No back-and-forth.
Sebastien Rousseau is a senior banking technologist who writes and builds at the edge of payments, post-quantum cryptography, and applied AI. Author of open-source libraries used in financial infrastructure; contributor to the Emerging Payments Association Asia Quantum-Safe Cryptography Working Group.
Sebastien Rousseau is a senior banking technologist with 20+ years across HSBC Commercial & Investment Bank, PayPal, Barclays, Shazam, AKQA, and Virgin Group. He authors open-source Python and Rust libraries that turn ISO 20022 migration, post-quantum cryptography, and applied AI from policy paper into inspectable code. He contributes to the Emerging Payments Association Asia Quantum-Safe Cryptography Working Group and publishes Banking On Quantum and Banking On AI at sebastienrousseau.com.
Sebastien Rousseau is a senior banking technologist focused on the structural transformation of wholesale payments. Across HSBC Commercial & Investment Bank, PayPal, Barclays, Shazam, AKQA, and Virgin Group, he has shipped payment platforms, AI products, and open-source infrastructure used in production by treasury and payments teams. He authors and maintains pacs.008, pain.001, BankStatementParser, KyberLib, CloudCDN, and dotfiles, each positioned as a reference implementation, not a demo, for inspectable, board-grade financial infrastructure. He is a contributor to the Emerging Payments Association Asia Quantum-Safe Cryptography Working Group, co-author of the EPA white paper "Quantum-Safe Payments: Why the Payments Industry Must Act Now" (September 2025), and publishes Banking On Quantum and Banking On AI. He works at the intersection of agentic AI, real-time payments, post-quantum cryptography, cloud-native resilience, structured data, and regulatory evidence.
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Invite me to speak →Keynotes, panels and expert comment on payments, post-quantum cryptography and applied AI. In London, across Europe, or remote.