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Browse allDesign Netflix Open Connect (Streaming CDN)
Netflix's purpose-built CDN serving 200M+ users. Tests bitrate adaptation, edge placement, manifest design, and capacity planning. Open-ended senior-loop favorite.
Design an Amazon Fulfillment Center System
Inventory tracking, robotics control, picking/packing optimization, order routing. Tests cyber-physical workflow design + real-time coordination at warehouse scale.
Design iMessage, End-to-End Encryption + Delivery
Apple ICT3+ canonical system design. Tests asymmetric crypto, multi-device key fan-out, offline delivery, and the privacy-first architecture Apple grades senior candidates on.