Bank Statement Parser Logo Bank Statement Parser

Engineering & Leadership

About Sebastien Rousseau

Principal engineer building high-assurance, privacy-first financial infrastructure and cryptographic document tooling.

Sebastien Rousseau

Sebastien Rousseau

Principal Financial Systems Architect · 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. Explore his work, publications, and advisory at sebastienrousseau.com.

Engineering Pedigree & Domain Expertise

With nineteen years of hands-on systems engineering across tier-1 investment banking, clearing gateways, and treasury infrastructures in London and international financial hubs, Sebastien specializes in high-throughput document tokenization, payment message harmonization, and post-quantum cryptographic security.

  • 19 Years in Production Finance: Architecture of mission-critical systems across Corporate & Investment Banking (CIB), SWIFT payment gateways, SEPA clearing schemes, and real-time treasury ledger reconciliation.
  • Author of Sovereign Open-Source Libraries: Creator of Bank Statement Parser, KyberLib (FIPS 203 ML-KEM module lattice-based key encapsulation), hsh, and ISO 20022 message engines with over 45.7M+ total package downloads.
  • Standards & Protocol Conformance: Deep domain mastery of SWIFT Standards Release 2026 (MT940, MT942, field :86: sub-tags), ISO 20022 cash management (CAMT.052, CAMT.053, CAMT.054), payment initiation (PAIN.001), and North American BAI2 cash reporting.
  • Zero-Telemetry Sovereign Architecture: Committed to building air-gapped, sovereign financial tools that execute locally with zero telemetry, preserving absolute banking confidentiality and data sovereignty.
  • Personal Website & Keynotes: Visit sebastienrousseau.com for technical white papers, research monographs, and conference addresses on financial engineering and cryptographic assurance.