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365

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Jan 2026

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Software Engineering Best Practices, System Design, High Scale, Algorithms, Math, Programming Languages, Statistics, Machine Learning, Databases, Front Ends, Frameworks, Low Level Machine Structure, Papers and Computing, Computer Science Book Reviews - Everything!

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January 25, 202640 min

The Almost Correct System

RexIDE - https://rex.mindmeld360.com

January 24, 202631 min

Design Local Delivery Service - GoPuff - System Design Interview Series

RexIDE - https://rex.mindmeld360.comIn this episode, we design a local, ultra-fast delivery system inspired by GoPuff.We break down:service boundaries (ordering, inventory, dispatch)real-time courier assignmentwarehouse-centric delivery vs marketplace modelslatency, batching, and failure scenarios

January 22, 202629 min

Java Memory Model (JMM)

RexIDE - https://rex.mindmeld360.comWe explore the fundamental concept of Happens-Before (HB)—not a measure of time, but a formal mathematical relationship that provides the only real guarantee of visibility and ordering in a multi-threaded world. Without an HB edge, your threads are effectively living in different realities, where one thread might see an object has been published but observe its internal fields as stale or uninitialized zeros.