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Staff+ Interview Prep (v15)

GitHub-friendly view of v15. Use the links below — GitHub renders Markdown natively. For search, tabs, and interview mode, open the interactive HTML.

Delivery framework

  1. Requirements (3–5 min) — functional + NFRs, draw out-of-scope line
  2. Estimation — QPS, storage, bandwidth to justify decisions
  3. API design — REST / WebSocket / gRPC, name routes explicitly
  4. Data model — entities, SQL vs NoSQL with justification
  5. High-level design — client → LB → services → DB/cache
  6. Deep dives — 2–3 hardest problems, tradeoffs, failure modes

Architecture framework — skeleton → 2 questions → 5 archetypes (feed, transactional, real-time, marketplace, pipeline). Derive designs instead of memorizing them.

Key numbers: Redis ~100K–1M ops/s · Single DB ~10K–50K QPS · Kafka ~1M+ msgs/s · Cross-region ~100–200ms

Full interactive cheatsheet includes DB chooser, cloud commands, and estimation worksheet.

Easy (4)

Medium (18)

Hard (18)