Senior Product Manager, Wholesale Payments & API
Leads wholesale payments API products in HSBC Commercial & Investment Banking, having joined in 2016 as API Engineering Lead.
Earlier at HSBC: API Engineering Lead (via Reedia Ltd).
20+ Years in payments, banking and digital technology
120 Sigstore-signed research articles
52.8M Open-source downloads (PyPI · crates.io)
FIPS 203 NIST track · ML-KEM implementation
The work
Wholesale payments infrastructure that has to be correct.
Senior payments and financial services leader. At HSBC Commercial & Investment Banking he leads wholesale payments API products: Treasury APIs, Banking-as-a-Service, and the ISO 20022 wholesale rails that settle correspondent payments at scale.
More than 20 years in payments, banking and digital technology: founder and chief executive of Reedia, head of mobile technology at AKQA, Head of Mobile at Shazam, and senior roles at PayPal and Barclays. The same product-engineering discipline now applies to retail, wholesale, and post-quantum work.
Leadership
More than 20 years leading payments, mobile and digital products.
Sebastien Rousseau is a senior payments and financial services leader who has built and led digital, mobile and payments businesses for more than 20 years, from founding and running his own consultancy to heading AKQA's mobile technology division, and now leads wholesale payments API products at HSBC.
Founder and Chief Executive Officer
Founded Reedia Ltd and ran it as Chief Executive Officer for nearly seven years, delivering senior technology engagements through it, including the HSBC API engineering role that became his permanent post.
Senior Solutions Architect, Professional Services & Strategic Partnerships
Shaped PayPal's HCE and tokenisation strategy with tier-one banks and mobile operators across the UK and Europe.
Mobile Banking Workstream Lead
Led a mobile banking transformation workstream for Barclays Corporate Banking with zero critical post-launch incidents.
Head of Mobile
Led mobile at Shazam as it extended from music recognition into second-screen TV experiences.
Head of Mobile Technology
Headed AKQA's mobile technology division, leading mobile work for Nike, RBS, MTV, GAP, Nokia and Target.
Earlier at AKQA: Technical Web Architect / Senior Web Developer → Java Software Engineer → Technical Manager.
Earlier: web and internet technology roles at Virgin, Consotel and JSB Training and Development (2000–2005).
Credentials
Education, memberships and recognition.
The research
Banking research, signed and dated. Every article verifiable.
Applied AI, ISO 20022, post-quantum cryptography. Every piece written for senior architects and CTOs who need to make architectural calls, not read press releases.
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). Editor of Banking On Quantum and Banking On AI.
The output
Open source the standards bodies and lab evaluators can actually read.
KyberLib: an ML-KEM implementation in Rust, evaluated by Qtonic Quantum Lab and adopted by QGram.
pain001: ISO 20022 payment-file automation. BankStatementParser: turns multi-format statements into structured data. CloudCDN: an open-source edge CDN blueprint.
Trusted across
Speaking and events
Keynotes, panels and briefings for banking and payments leaders.
Talks on enterprise AI in banking, ISO 20022 migration, and quantum-safe payments. Written for boards, regulators, and the engineers who ship the rails.
Where to next
Pick the surface that fits your question.
Research notes
Read the articles
120 signed, dated pieces on applied AI, ISO 20022, and post-quantum cryptography.
Browse ProofSee the case studies
Five evidence-first builds, every metric verifiable without going through me.
Explore ConversationGet in touch
Consulting, speaking, advisory. Tier-1 banking technology engagements only.
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