System Design Interviews: What Actually Predicts Engineering Performance?
Feb 24 · 7 min read · The first time I ran a system design interview, I walked out thinking we'd nailed it. The candidate drew boxes, mentioned load balancers and caches, and sounded like they'd read the same blog posts I
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Design a URL Shortener Like Bit.ly: Notes on the Unknowns
Jan 17 · 6 min read · This article is not a step-by-step solution. It’s a record of the assumptions I had, the gaps I discovered, and the details I didn’t fully understand until I tried to design a URL shortener myself. 1. Solved: 2026-01-15 2. Reference Solution https...
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What Companies Really Evaluate in a System Design Interview (Not What You Think)
Dec 6, 2025 · 5 min read · You come to the room. The interviewer is smiling and after a short chat, they put the sentence which immediately changes your brain to system-design mode… So… how would you design a scalable system for ____ ? You have the marker. The board is empty. ...
Join discussionCache Invalidation The Untold Challenge of Scalability
Dec 3, 2025 · 10 min read · Introduction the unexpected challenge of Cache Invalidation Hi all, a few months ago, I was working on an internal analytics platform we built for our operations team. It wasn’t a flashy consumer product or a major internal tool, just a simple dashbo...
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The System Design of UPI: How India's Instant Payment Revolution Works ?
Nov 30, 2025 · 5 min read · The way money is transferred in India has fundamentally changed over the last decade. From complex forms and waiting hours for transfers, we’ve moved to instant, seamless transactions powered by a revolutionary system: the Unified Payments Interface ...
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System Design Interview Ch 1
Sep 15, 2025 · 14 min read · 前言 這本書的重點面試中關於系統設計問題的環節。因為系統設計沒有範圍沒有固定模式，什麼都能提出來討論跟討論，問題範圍太大，整個過程非常開放，且幾乎沒有標準答案。 所以在這過程中，主要考察的是溝通與問題解決能力。評估面試者如何分析與拆解問題，並且與面試官說明想法與討論。 系統設計問題是開放式的。就像真實世界一樣，系統之間存在各種差異與變體。期望的結果是提出一個能達成系統設計目標的架構。討論方向會依面試官有所不同：有人會涵蓋所有層面的高階架構，也有人會挑出一兩個領域深入鑽研。一般而言，系統需求、限制...
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Cracking the LLD Interview
Jun 7, 2025 · 2 min read · 🎯 What Even Is Low-Level Design? Low-Level Design (LLD) is where your big ideas transform into actual code that: Builds without errors Remains adaptable to change Scales gracefully Think of it as crafting detailed Lego instructions rather than ...
Join discussionA Beginner's Guide to System Design
May 18, 2025 · 5 min read · Building a scalable and reliable system might sound complicated, but it's not when explained through simple real-world examples. Let’s imagine you are creating your version of Amazon — a high-traffic e-commerce platform. This blog post will guide you...
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Vertical or Horizontal Scaling: How to Choose the Best for Your Business
Apr 15, 2025 · 6 min read · 📈 What is Scaling and Why Do We Need It? (With a Simple Real-Life Analogy) Before jumping into any technical concept, the best way to understand it deeply is to first ask:“What is it?” and then,“Why do we need it?” That’s exactly what we’re going to...
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