About Sebastien Rousseau

Sebastien Rousseau

Principal Cryptographic Architect & Founder · 19 Years in Production Banking Infrastructure

Sebastien Rousseau has spent nearly two decades architecting, building, and securing high-volume transaction processing systems, institutional payment rails, and cryptographic protocols across global financial centres.

Professional Background & Credentials

• 19 Years in Production Systems: Deep experience across corporate and investment banking (CIB), real-time payment rails, clearing ledgers, and Hardware Security Modules (HSMs).
• 45.7M+ Open-Source Downloads (as of September 2026): Author and maintainer of high-performance Rust cryptographic libraries, including KyberLib (ML-KEM-512/768/1024), hsh (cryptographic password and digest utilities), and ISO 20022 message parsers.
• Independent Practitioner Voice: Frequent speaker at international financial technology forums, FINOS working groups, and cryptographic standards roundtables.
• Editorial Standard: Every paper on Banking On Quantum is independently authored, free of vendor sponsorship, and signed with Sigstore cryptographic provenance.