@TapsTechie

🎟️ Why One Seat Can't Be Sold Twice: The Engineering Behind Bulletproof Booking Systems

Sep 12, 2025 · 5 min read · The Million-Dollar Race Condition Picture this: Arijit Singh announces a surprise concert. Within seconds, 2 million fans are quickly clicking "Buy Now" for the last 50,000 seats. At 3:00:01 PM, seat A-14 shows as available on 10,000 different screen...

🔍 Tracing & 🚨 Alerting in System Design (Part 3 of Observability Series)

Sep 11, 2025 · 4 min read · Introduction: Why Metrics & Logs Aren’t Enough Imagine you’re debugging a checkout flow in an e-commerce system: Metrics say latency has spiked. Logs show database timeouts. But you don’t know: Which request was slow? Which service in the chain ca...

📝 Logs in System Design (Part 2 of Observability Series)

Sep 11, 2025 · 4 min read · Introduction: Why Logs Matter Imagine you’re running a Payment API. Metrics tell you: “Error rate = 5% in the last 10 minutes.” But metrics don’t tell you why. To debug, you need logs — the detailed “story” of what happened inside your system. Lo...

📊 Metrics in System Design (Part 1 of Observability Series)

Sep 11, 2025 · 4 min read · Introduction: Why Metrics Matter Imagine you’re running an API for an e-commerce checkout system. Users are complaining that "checkout feels slow." Your dashboard shows CPU usage is fine. What’s wrong? Without metrics, you’d be guessing in the d...

A Beginner's Guide to Conflict-Free Replicated Data Types (CRDTs)

Sep 10, 2025 · 5 min read · Introduction: Why Conflicts Happen in Distributed Systems Imagine you and your friend are both editing the same shared to-do list. You add “Buy milk”. At the same time, your friend adds “Buy bread”. When the system tries to merge these updates, w...