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R

Rohit · Blog

Java Full Stack Developer | Spring Boot • Microservices • React.js • Azure • AWS | Building Scalable, Cloud-Native Applications

3 blogs

  • ·Jul 28, 2026·8 min read

    How UPI Guarantees You're Never Charged Twice: The Architecture Behind India's Payment Backbone

    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 — High Level Design (HLD)
    • Low Level Design (LLD)
    • +2 more
    00
    Read article
  • ·Jul 20, 2026·5 min read

    Why Your HashMap Suddenly Stops Working (Even Though Nothing Changed)

    The most dangerous bugs aren't the ones that crash your application... they're the ones that silently return the wrong result. If you've been working with Java for a while, you've probably experienced something like...

    • Java
    • Java Interview Preparation
    • +2 more
    20
    Read article
  • ·Jul 17, 2026·9 min read

    Inside Revquix: How a Notification Reaches You Instantly, on Every Device, Without Ever Putting Your Login Token in a URL

    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...

    • System Design — High Level Design (HLD)
    • System Design Interview (HLD)
    • +2 more
    10
    Read article

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