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Designing a Flutter Booking Marketplace: An Engineer's Review of Availability, Payments and Scale

by Journeyhorizon dev.to

5 min read

Booking apps look simple in a demo. A user picks a slot, pays, gets a confirmation, and everyone moves on. Then production happens: a provider in Berlin edits availability while a customer in Singapore is mid-checkout, a payment webhook arrives after the user has already closed the app, and the push notification that should have said "your session starts in 15 minutes" lands an hour late. If you …

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