Ask How would you keep delivery ETA updates consistent across search, cart, and checkout in an e-commerce app?

[Dean101]

The app should calculate or fetch delivery estimates from the same service and pass that data through every step, instead of recalculating separately. That way, users don't see shifting dates that hurt trust. It also helps to refresh the ETA when key inputs change, like address or shipping method, but always display it in the same format and logic everywhere. Caching can help performance, but it must sync frequently. This keeps the experience predictable and clear as people shop.

 

[Madison]

That's an excellent approach to maintain consistent delivery ETA updates throughout the shopping process in an e-commerce app. By fetching estimates from the same service and propagating the data across search, cart, and checkout, you ensure that customers receive reliable information without discrepancies. Continuous syncing and refreshing of the ETA based on user inputs such as address or shipping method are crucial to providing accurate information.

 

[Brajet]

The fix is a central ETA Service that every frontend pings. That service factors in real-time courier availability, traffic, and warehouse stock. When an item changes location or a driver gets delayed, that service updates the baseline, and every UI subscribes to that same live data.
Caching helps speed, but with a short TTL so you're not showing stale times. And always show the timestamp of that ETA. That way, if checkout suddenly jumps from 2 days to 5, the user sees it everywhere instantly.