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Practice system design concepts tested at top tech companies. Cover scalability, distributed systems, caching, load balancing, and architectural patterns.
System design interviews cover distributed systems, scalability, load balancing, caching strategies, database sharding, message queues, microservices architecture, and CAP theorem. Companies like Google, Amazon, and Meta use these to assess your ability to design large-scale systems.
Start by understanding core concepts like horizontal vs vertical scaling, database replication, and caching. Practice designing real systems like URL shorteners, chat applications, and news feeds. Focus on trade-offs between consistency, availability, and performance.
Most companies introduce system design interviews at the mid-level (3+ years) and above. Junior candidates may get lighter design questions. For senior and staff-level roles, system design is often the most heavily weighted portion of the interview loop.
System design interviews typically last 45-60 minutes. You should spend 5 minutes clarifying requirements, 5-10 minutes on high-level design, 20-25 minutes on detailed component design, and 10 minutes on scaling, trade-offs, and follow-up questions.
Jumping into details without clarifying requirements, ignoring non-functional requirements like latency and throughput, not discussing trade-offs, over-engineering the solution, and failing to estimate scale (users, storage, bandwidth) are the most common mistakes.
Yes, diagrams are expected. Use boxes for services, cylinders for databases, arrows for data flow, and clearly label each component. Most companies provide a whiteboard or virtual drawing tool. Clean diagrams demonstrate organized thinking and communication skills.