System Design interview questions and full interview replays with engineers from Google, Amazon, and more

We've helped thousands of engineers get jobs at top companies. Now it's your turn! Prepare for System Design interviews with questions and full interview replays below. All questions and interviews have been shared with permission from all participants.

Aerodynamic Tortoise interviewed by Digital Cactus, a Facebook engineer

Design Online Judge
Design Online Judge, given a problem, allow users to submit code, test code and get result of submission.

Electric Tetrahedron interviewed by Metal Cephalopod, a FAANG engineer

Design LeetCode
Design a coding competition platform with a leaderboard and execution environment.

Golden Possum interviewed by Invincible Cloud, a Microsoft engineer

Unique ID generation
Design a distributed system to provide a unique ID with each request

The Incredible Hawk interviewed by Intergalactic Avenger, a Google engineer

File parsing
1) Given an inefficient file structure, how would you store data to efficiently look up the query?

2) How would you alter this if you had many computers available?

Space Pheonix interviewed by Intergalactic Avenger, a Google engineer

Distributed databases
How would you organize a database such that you can add more machines once your current ones reach maximum capacity.

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