Level Up Coding System Design Newsletter

Level Up Coding System Design Newsletter

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December 2025

API Architecture Styles Made Simple
(6 Minutes) | How Each Works, When to Use Each (and When Not to), Benefits, and Tradeoffs
 • Nikki Siapno
Pub/Sub Clearly Explained (in Under 6 Minutes)
(6 Minutes) | How It Works, Best Practices, Why Teams Reach for It, When Not to Use It, and Tradeoffs
 • Nikki Siapno
Connection Pooling Clearly Explained
(6 Minutes) | The Problem, How Pooling Works, Benefits vs Tradeoffs, and The Sweet Spot
 • Nikki Siapno
Consistent Hashing Clearly Explained
(6 Minutes) | How It Works, Why It Matters, and When Not to Use It
 • Nikki Siapno
How Rate Limiting Prevents Outages Before They Happen
(5 Minutes) | What Breaks Without Limits, Solutions, Best Practices, Risks, and Trade-Offs
 • Nikki Siapno
ACID vs BASE
(5 Minutes) | How Each Works, The Core Trade-Off, When to Use Each (and When Not to)
 • Nikki Siapno
Health Checks vs Heartbeats
(4 Minutes) | What They Do, When to Use Each, and How They Work Together in Real Systems
 • Nikki Siapno

November 2025

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