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DSA fundamentals & practice

Scalable systems & architecture

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Apr 15, 2025 • 14 min • Pawan Kumar

arrays strings two-pointers

You’re debugging a slow search feature. Users are complaining it takes 3 seconds to find anything. You’ve tried everything—better servers,...

Apr 14, 2025 • 14 min • Pawan Kumar

System Design URL Shortener Scalability

Ever wondered how Bit.ly and TinyURL handle billions of redirects? Learn how to design a production-ready URL shortener from scratch,...

Mar 24, 2025 • 32 min • Pawan Kumar

Web Development DNS HTTP

I spent 3 hours debugging a 'slow website' before realizing the issue wasn't my code—it was DNS propagation. That's when...

Mar 11, 2025 • 32 min • Pawan Kumar

DSA Data Structures Algorithms

An experienced developer's honest DSA roadmap — exactly where to start, what order to follow, and how to stop feeling...

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