The Celebrity Problem

A medium Data Modeling interview practice problem on DataDriven. Write and execute real data modeling code with instant grading.

Domain

Data Modeling

Difficulty

medium

Seniority

L5

Problem

We are building a social platform where users can post content, follow other users, and see a personalized timeline of posts from people they follow. The data science team needs to analyze engagement patterns, and the product team wants to support timeline queries at scale. Design the data model.

Summary

One post. A million notifications. Something has to give.

Practice This Problem

Solve this Data Modeling problem with real code execution. DataDriven runs your solution and grades it automatically.