System Design Interview Questions
Practice 5 System Design interview questions across every experience level. Think through each one, then reveal the model answer.
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5 questions
DNS Resolution When You Type a URL
Walk me through what happens when you type a URL and press Enter, focusing specifically on the DNS resolution process.
JuniorbeginnerInstant Credit Card Validation
How does a credit card form validate numbers instantly, before even contacting the bank?
JuniorbeginnerUsername Availability with Bloom Filters
Explain how you'd check username availability for a service with billions of users without hitting the database on every keystroke.
MidintermediateCDN Image Delivery Under 50ms
Explain how a CDN serves images to users worldwide in under 50ms.
MidintermediateSearch Autocomplete System Design
Design the backend for a search autocomplete system that returns suggestions within 100ms as the user types.
Senioradvanced