Marketing OS, inside Indizilla · systems designer
The model proposes, you decide
Deterministic code decides anything with a right answer.

01Cover — Marketing OS, a product inside Indizilla, read as a systems designer.Full size ↗ 
02Overview — What it covers, and how big it actually is.Full size ↗ 
03The sentence that explains the rest — A budget cap is enforced by an if statement, not by asking a model to be careful.Full size ↗ 
04No fake integrations — Six named states, and the first run that is meant to be empty.Full size ↗ 
05A missing number is not zero — And a rate carries the denominator that produced it.Full size ↗ 
06Money is decided by code — Campaigns launch paused, and a watcher reads the money already leaving.Full size ↗ 
07Approval-first, and raw data kept raw — Two invariants that decide what the system is allowed to forget.Full size ↗ 
08Everything outside is data — Three invariants that treat the whole outside world as untrusted.Full size ↗ 
09Tenancy is a security boundary — 404 rather than 403, a failure that closes, and a test that greps the routes.Full size ↗ 
10The read-backs — Ask the vendor what it thinks, separately from what your own rows believe.Full size ↗ 
11The port — Taking a synchronous data layer off its driver, and what the typecheck did not prove.Full size ↗ 
12What is missing — In the order the author would fix it.Full size ↗ 
13Stated limits — What this study could not verify.Full size ↗