Coding Interview Questions by Concept

System design concepts

Design interviews test a different toolbox: architectures instead of algorithms. Each of these is a free interactive course with animated request flows and runnable simulations, and the design library has full prompts to apply them on.

• Caching5 lessons · ~51 minAnswer the repeat questions from memory, and most of your traffic never touches the database.Learn it10 design problems
• Load Balancing & Scaling5 lessons · ~50 minOne server becomes twenty behind a single address, and nobody on the outside can tell.Learn it10 design problems
• Database Scaling5 lessons · ~52 minIndex it, replicate it, then shard it, in that order and only as far as the numbers force you.Learn it14 design problems
• Consistency & Trade-offs5 lessons · ~51 minWhen the network splits, you choose what breaks. Know what you're choosing.Learn it11 design problems
• Queues & Async Processing5 lessons · ~50 minTake the slow work out of the request, promise to do it soon, and smooth every spike.Learn it12 design problems