I Built Tic-Tac-Toe the Old Way — Before Coding Agents
What I did. I recently built a multiplayer Tic-Tac-Toe backend in Go. At first, it sounds almost too simple to be worth writing about. It has a 3×3…
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LLD Data Structures in Design Context: Why HashMaps Feel So Fast — Understanding Performance Without Memorising Big-O
"A HashMap feels fast not because computers became magically faster. It feels fast because the design avoids doing unnecessary work." In the previou…
LLD Data Structures in Design Context: Why Modern Software Needs Fast Lookup Before Anything Else
"The biggest challenge in large software systems isn't storing information. It's finding the right information instantly." By now we've established…
LLD Domain Modeling: The Only Cheat Sheet You Actually Need (Interview + Real System Design)
After going through entities, invariants, state machines, aggregates, bounded contexts, and full systems like Ride Sharing, BookMyShow, and Amazon C…
LLD Domain Modeling: How Real Systems Evolve Over Time (Versioning, Change & Refactoring Reality)
One thing beginner LLD tutorials rarely show is this: real systems never stay in their “initial design”. They evolve constantly: new features get ad…