TL;DR / Key Takeaways Why Load Balancers Matter They turn many unreliable servers into one reliable service. A good load balancer hides failures, spreads load, and enables horizontal scaling. L4 vs L7 in Simple Terms Use L4 when you only need even traffic. Use L7 when you need smart routing. Where Load Balancers Sit Most […]
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TL;DR / Key Takeaways The Three Numbers You Always Need A simple rule: If you do 1,000 QPS and average latency is 200 ms (0.2 s), concurrency is about 200 requests in flight. Worked Example: Concurrency to Instance Count Assume a peak of 2,500 QPS and p95 latency of 120 ms. Utilization and Queueing Intuition
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TL;DR / Key Takeaways What System Design Interviews Actually Test Most interviews are not asking for the most complex system. They are asking whether you can: A strong answer looks like an architect thinking out loud, not a checklist of technologies. Requirements First: Functional and Non-Functional Functional requirements define what the system must do. Non-functional
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