Domains
Technology only makes sense once you know the business it runs. Each domain here is a learning path through one industry: who the players are, how work and money move between them, the regulations they follow, and the data standards and systems engineers build on. Topics run from basic to advanced, so you can start at the top and stop where your work needs you to.
US Healthcare
How care is insured, coded, authorised, billed and paid in the US, and the data standards behind it: payers and providers, Medicare and Medicaid, revenue cycle, HIPAA, EDI X12, HL7 and FHIR.
Communications & Telecom
How carriers, networks, OSS/BSS, billing and number management fit together, from 4G/5G to messaging platforms.
Banking & Finance
Payments, cards, core banking, lending and capital markets, with the rails (ACH, SWIFT, ISO 20022) and regulations (PCI DSS, SOX, KYC/AML) that shape their systems.