Decisions behind the systems.
Practical notes on the access, data and AI boundaries used in documented builds. Each article links to the case study it draws from.
- How I design tenant isolation for operational SaaSTenant isolation works when the application establishes identity once, carries it through the request and lets the data layer enforce the boundary.
- How I keep AI output inside an application contractAI output becomes usable application data when preparation, validation and visible failure handling surround the model call.
- How I model courier COD reconciliationCOD reconciliation becomes easier to inspect when the cash obligation stays attached to the shipment that created it.