In a todo application a user's data is supposed to be synced in multiple devices. When there is a change made in the todo list in one device, the other device's UI needs to update without refresh. How would you achieve it. I explained short polling, web sockets for this. The interviewer kept drilling deeper into almost all topics.

Question

Accepted Answer

Real-time synchronization of todo list across multiple devices using short polling and web sockets.

Implement short polling to regularly check for updates on the server and update the UI accordingly.
Use web sockets for real-time communication between devices to instantly push updates to all connected clients.
Maintain a centralized database to store and retrieve the todo list data for all devices.
Utilize a messaging queue system to ensure reliable and ordered delivery of updates to all devices.
Implement conflict resolution mechanisms to handle simultaneous changes on different devices.

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