Practice explaining when independent async operations should use `Promise.all` and when dependency order should remain sequential.
Rafi R backend teammate 01 Dependency 02 Concurrency 03 Failure The review 30 sec Scenario Rafi bundled five awaits into one Promise.all to make a billing route faster. The route now looks efficient, but one business decision may be running too early. 5 promises bundled together 1 charge must wait for account verification
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