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10 System Design Tips (Senior-Level) April 8, 2026 Yutong Jin 🧠 System Design Key Principles 1. Start with Functional Requirements Clearly define what the system needs to do: Core APIs (read/write flows) User interactions Edge cases 💡 Tip: Do NOT spend too long here — 2–3 minutes is enough in interviews. 2. Identify the Core Bottleneck Early Before designing, ask: What is the expected QPS? Where will the system break first? Common bottlenecks: ...