Scenario quizzes · earn level badges
Quizzes
10 production scenarios per track. Each question carries a level — junior, senior, staff, architect. Each has a 300-word explanation linking to the chapter behind it.
10 questions
High-Level Design
Cache stampedes, sharding tradeoffs, CAP under partition, idempotency, replication, fan-out. Scenarios from real production.
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Low-Level Design
Strategy vs Template Method, observer leaks, optimistic vs pessimistic locking, deadlock prevention, state machines. Design decisions, not trivia.
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AI Engineering
Hybrid retrieval, prompt injection defence, RAG eval, multi-agent vs single, memory architecture, cost diagnosis. Senior-grade calls.
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DS & Algorithms
Sliding window vs two-pointer, when greedy beats DP, LRU implementation, Union-Find, shortest-path algorithm selection. Algorithm judgment.
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