A new city changes everything.
You're launching in Chattogram. Suddenly every decision needs evidence, not instinct, and the product has to speak a new language and handle a new region correctly.
Measure what happens.
Every action emits an event; events in sequence form funnels that show where users drop; A/B tests settle debates with data; and heavy analysis runs on a warehouse, not the live product.
Reach people, and speak their language.
Push notifications and deep links pull users back to the right screen; email and SMS deliver receipts and codes; localization and correct currency-and-time handling make the product feel native; multitenancy lets one system serve many isolated customers.
You worked through Phase 7: grow beyond one city. 9 new concepts joined your architecture along the way.
That is the full build. Every concept you met has its own page in the catalogue.