Backend · Mid-level · System design

Design uploading and processing of user photos: a user uploads an image, the service generates thumbnails in several sizes and shows them in a feed.

~10 min by voice

How to approach it

They're checking whether the candidate can separate uploading, storage, heavy processing and serving of media: files in object storage, processing asynchronously through a queue, serving through a CDN, plus reliability and security (validation, idempotency, cleanup).

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Topics

system design file storage async processing

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Answer by voice

The interviewer will ask this question and listen. Think out loud and ask for a hint if you need one. When you're done, pause or tap “That's my answer”. In about a minute, your score and the points you covered show up here.

Best with headphones · ~10 min