← Back to home
Architecture Lab
Reference designs, architecture decisions, and playbooks.
Illustrative material and personal labs. Nothing here describes a client production system.
System DesignArticle
Multi-subsidiary banking middleware
An integration boundary for several regulated entities.
Read ↗
Payment FlowsArticle
Mobile money integration patterns
Adapters, idempotency, and unreliable callbacks.
Read ↗
Payment FlowsRepo
Double-Entry Ledger Platform
Reference platform for wallets and ledger.
View repository ↗
Reliability EngineeringRepo
Payment Platform Disaster Lab
Ten failure scenarios, one rule: nothing lost, nothing twice.
View repository ↗
Reliability EngineeringArticle
The retry storm that almost paid twice
Ninety seconds and three payouts.
Read ↗
Architecture DecisionsADR
ADR: double-entry ledger for payments
Why the ledger, and what it costs.
Read the ADR ↗
Engineering PlaybooksPlaybook
Architecture reviews that help
Ranked findings, reference designs, action plan.
Read ↗
Want the thinking behind the systems?
Read a case study, or send a brief if you have a reliability or architecture problem.