Technical Articles

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How PhonePe and Paytm Avoid Lost Money on System Crashes

How UPI apps like PhonePe/Paytm keep payments safe using idempotency, sagas, and state machines.

•Mar 3, 2026•5 min read

Deep dive into polling, SSE, and WebSockets with trade-offs, patterns, and code for real-time web apps.

•Feb 21, 2026•4 min read

Turn a rainy-night taxi story into clear, concrete Uber system requirements.

•Jan 9, 2026•4 min read

AI agents are moving from toy copilots to production teammates—changing how engineers design systems.

•Jan 7, 2026•3 min read