Navigating System Design Interviews

Unlike LeetCode style algorithmic questions, system design interviews are highly ambiguous, open-ended conversations. You are given a massive prompt like "Design Twitter" and expected to build a scalable architecture in 45 minutes.

The 4-Step Architecture Playbook

Success in a system design interview is about methodology, not just technical knowledge.

1. 1
   Requirements Gathering: Never start designing immediately. Ask clarifying questions. What is the scale? Write-heavy or read-heavy? Are we optimizing for latency or consistency?
2. 2
   High-Level Design: Draw the absolute simplest, 10,000-foot view. Establish the core data entities and their relationships.
3. 3
   Deep Dive & Scaling: The interviewer will point to bottlenecks. It's your job to introduce caching, message queues, database sharding, or CDNs depending on the bottleneck.
4. 4
   Identify Edge Cases: Proactively identify the single point of failure in your own design before the interviewer does. This shows mature engineering foresight.