System Design

It is 11:59:58. A flash sale is about to open, and one lakh people have the same phone on screen, thumbs hovering over "Buy". The sale starts at 12:00:00, and there are exactly 500 units in stock. At 12:00:00 every one...

• Java
• Spring Boot
• +2 more

Idempotency ensures that no matter how many times a request is made — the result stays the same... If the same ID comes again → it replies with the same result (not a new payment) India’s UPI processes billions of...

• System Design
• Low Level Design
• +1 more

I don't usually write about my own code. But last week I reread one specific piece of Revquix's backend - the real-time notification system - the way I'd review a stranger's pull request. No memory of writing it, no...

• Spring Boot
• System Design
• +1 more