Design Exercises
Open-ended prompts with no multiple choice. Draw the architecture, get a structural score, then compare with a sample answer.
0 / 45 solved
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Read-Heavy Web Systems
URL shorteners, pastebins, and content sites.
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Social & Feed Systems
Follower graphs, timelines, fan-out, and the celebrity problem at social-network scale.
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Media, Streaming & Storage
Video and file systems: upload pipelines, transcoding, adaptive bitrate delivery, sync, and petabyte storage.
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Real-Time, Chat & Location
Messaging, presence, ride matching, and live collaboration.
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Data & Analytics Pipelines
Click aggregation, metrics, crawlers, and near-real-time analytics.
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AI Product Systems
Agent harnesses, memory services, RAG assistants, and LLM gateways.