medium
Design a Two-Way CRM and Billing Sync
Guided walkthrough
Build the design one decision at a time
Work through each decision, then practice explaining the full design on your own.
The scenario
The idea to remember
Treat synchronization as a stateful, observable product—not two API calls connected together.
- 01Understand the customer problem
- 02Turn the problem into requirements
- 03Define data and ownership
- 04Walk the end-to-end design
- 05Handle failures and security
- 06Operate and roll out
At each step, first understand the logic, then read the example aloud in your own words.