The System Design Newsletter

The System Design Newsletter

System Design Playbook 🔥
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May 23, 2025 • Neo Kim
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How Stock Exchange Works
Nov 18, 2025 • Neo Kim
How Stripe Prevents Double Payment Using Idempotent API
May 9, 2024 • Neo Kim
How Uber Finds Nearby Drivers at 1 Million Requests per Second
Jan 4, 2024 • Neo Kim
8 Reasons Why WhatsApp Was Able to Support 50 Billion Messages a Day With Only 32 Engineers
Aug 27, 2023 • Neo Kim
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I struggled with mobile system design until I learned these 53 concepts
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#143: Coordination architectures, protocols connecting them, and how to pick the right one before you write any code.
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29 LLM Evaluation Concepts Every Engineer Needs to Know
#142: From “it looked fine in testing” to a system you can actually trust
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Vector Database - A Deep Dive
#141: A Beginner’s Guide to the AI Stack’s Most Misunderstood Component
Apr 25 • Maxine Meurer and Neo Kim
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#140: The design decisions behind modern AI systems: how each design pattern works, where it breaks, and when to use it.
Apr 22 • Neo Kim
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