Sebastian Strub

business engineering and consulting

in payments and bitcoin

what I do

business engineering

I’ve spent seven years working on the payment systems behind the Swiss financial centre — from the QR Bill and next-generation debit cards to instant payments — turning scheme rulebooks and regulatory requirements into specifications that ship.
My core is requirements engineering for complex payment and card systems: ISO 20022, SEPA and SEPA Instant, SWIFT, and the domestic Swiss rails.
I also work across the payments landscape, not just one seat in it. As an independent consultant I advise fintechs and financial institutions on payment strategy, core-banking selection, and instant-payments scheme requirements.

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data analytics

I enjoy coding alongside writing specs and documentations. I recently shipped iso20022tester, an open-source ISO 20022 testing tool.
It generates and validates messages (pacs.008 and related types), with support for SEPA Instant and SPS CHF Instant, charge-bearer options, and IBAN/BIC validation. Built as a hands-on complement to my requirements and consulting work — the payment standards I specify on paper, implemented and testable in code.

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writing

Writing has always been a passion. Find my latests blogs on this page
You may also like the blog series I did a while back on Bitcoin and Lightning.

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Bitcoin Lightning Series (German)

blogs on history, banking, and other topics dear to me

You can use the button below or the payment widget to convince yourself how cool Bitcoin Lightning is

mail me