A friend got this question in an interview. The answer: Redis Sorted Sets. I decided to build a real-time leaderboard for our fitness challenge at Cars24.
While booking on RedBus, I wondered how seat blocking works across platforms. Turns out — independent blocking per platform leads to chaos. Here's the real solution.
I used to think Queues were just another DSA topic to clear interviews. Turns out they silently power every scalable system — from async processing to traffic surge protection.
My first system design interview was a disaster. Here's the framework I wish I had — from understanding requirements to wrapping up with strong impressions.