Snapchat Senior Software Engineer Interview Experience — LRU Cache and Thread Safety

Snapchat·Software Engineer·Aug 2026
Technical ScreenSenior+In progressmedium

Here is my Snap senior phone screen.

It started immediately with behavioral questions. It looks like I still need to keep a few short stories ready in my regular preparation, since I have heard that the quality of the behavioral answers carries weight in the evaluation.

The coding question was the classic LRU Cache problem. I had to be careful with the boundary cases while implementing it. The follow-up asked how I would make the solution thread-safe.

I hope I passed.

Published

Curated and edited by PracHub

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Interview at a glance

Company
Snapchat
Role
Software Engineer
Level
Senior+
Rounds
Technical Screen
Outcome
In progress
Difficulty
medium
Interview date
Aug 2026
Questions from this interview
1 question

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