The reversibility ladder
01
Identity and tenancy
User or organization? How is customer data isolated?
ExpensiveUser or organization? How is customer data isolated?
02
Primary keys and lifecycle
Deletion, export, backups, time, timezone, and currency.
ExpensiveDeletion, export, backups, time, timezone, and currency.
03
Billing model
Seat, usage, flat, or hybrid. Metering belongs in the write path.
ExpensiveSeat, usage, flat, or hybrid. Metering belongs in the write path.
04
Framework and hosting
Choose the thing you already know.
ReversibleChoose the thing you already know.
A sequence that holds up
Name the buyer and trigger event.
Map the current workflow and its workarounds.
Write scope by exclusion.
Design the data model before the screens.
Ship a walking skeleton on the real production path.
Add billing, monitoring, backups, rate limits, and admin tools early.
AI-assisted code changes the review budget.
Generated code can make a project feel faster while increasing comprehension debt. Never generate faster than you can inspect.
This page synthesizes the supplied build-and-architecture and AI-assisted-development research. The framework is analytical guidance, not a guarantee of delivery speed.