About Michael Afreh

Michael is a senior software engineer in Berlin with more than twelve years building and running production systems in banking, fintech and e-commerce — from core banking platforms across West Africa to e-commerce systems with millions of products. The kind of work where a bad assumption shows up as an incident report at 3am.

He started writing about money the way he writes design docs: state the constraints, name the failure modes, keep the operations boring. This book is the version of those notes he wishes someone had handed him at his first offer letter.