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Real system design questions from senior-level interviews

Step-by-step solutions for scalable distributed systems

Covers APIs, databases, caching & load balancing

Ideal for L5+ engineers targeting staff & senior roles

12k+ students

8k+ reported

70 problems

10 hours

Difficulty

Frequency

Last Reported

Design Distributed Web Crawler

Asked By

+4

Medium

-

Design Leetcode

Asked By

+1

Medium

-

Design Quota Service

Asked By

+1

Medium

-

Asked By

+5

Medium

2 days ago

Design Notification System

Asked By

+5

Medium

1 weeks ago

Asked By

+4

Hard

-

Asked By

+4

Easy

5 days ago

Design AI Chatbot App

Asked By

Medium

6 days ago

Design News Feed

Asked By

+11

Medium

-

Asked By

+1

Hard

1 days ago

Updated: May 13, 2026

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