Design Concurrent Edits to a Shared Record · System Design Interview

Design Concurrent Edits to a Shared RecordDesign what happens when two people open the same customer record in a CRM, both change it, and both press save.What it has to do

A save that would silently discard someone else’s change does not go through

The person whose save is rejected is told what changed

Two people editing different fields of the same record are not blocked from each other

Scale

Records: 400 million

Saves per day: 60 million

Out of scope

Real-time collaborative editing

The user interface

Permissions

Audit reporting

Practise this challengeAll system design challenges

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