Speaking & advisory
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.
Topics
What the November 2026 SWIFT cutover, FIPS 203, and harvest-now- decrypt-later mean for a Tier-1 payments stack — and how to turn the migration into a measurable, board-grade engineering programme.
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.
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.
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.
The five-component control plane that turns autonomous workflows into SR 11-7 / SS1/23 supervisory-ready evidence — OAuth-scoped service accounts, deterministic semantic routing, OPA policy gates, immutable WORM audit logs, and a tested kill switch.
Press & media
Short bio
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.
Medium bio
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.
Long bio
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 pacs008, pain001, 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 EPAA white paper "Quantum-Safe Payments: Why the Payments Industry Must Act Now" (September 2025), and publishes Banking On Quantum and Banking On AI. He sits at the intersection of agentic AI, real-time payments, post-quantum cryptography, cloud-native resilience, structured data, and regulatory evidence.