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The 3 AM Outage That Taught Me What a Load Balancer Actually Does
I got paged at 3:14 AM. Our “unbreakable” server had just face-planted in front of 70,000 users. Here’s the ugly, honest story of what actually happened — and the one piece of infrastructure I had been ignoring for years.
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7 Queue Patterns That Show Up in Every FAANG Interview (And How to Actually Learn Them)
Most people learn queues for five minutes, call it “easy,” and then freeze the moment an interviewer says “now do it without a second array.”
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7 Stack Patterns That Show Up in Almost Every FAANG Interview (With Code)
I ignored stack questions for two years of my career. Then I bombed an interview because of exactly that, and had to relearn everything the hard way.
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What Is a Load Balancer? A Beginner’s Guide With Real Examples and Code
From traffic police to Anycast routing — hardware, software, and cloud load balancers explained with real examples, not textbook definitions.
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GitHub Went Down for 24 Hours Because of CAP Theorem That You Learned in Just 5 Minutes
On October 21, 2018, GitHub had a network problem that lasted 43 seconds. That small problem caused GitHub to be broken for 24 hours and 11 minutes.
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Your API Is Fast. So Why Is Your System Still Slow?
The simple difference between latency, throughput, p90, p99, and scalability that every developer should understand
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What a Bad Flash Sale Taught Me About Latency and Throughput
The night a flash sale taught me that average latency is a lie, and throughput isn’t what most engineers think it is.
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The Sliding Window Roadmap Nobody Gave You
Every pattern, every trick, and the exact problems to practice — in the order that actually makes it click.
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There Are Only 4 Types of Two Pointer Problems — Here’s Every One of Them
I failed interviews thinking every sliding window question was a new puzzle. It wasn’t. It was always one of these four.
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Big O Notation Simplified: Understanding Time and Space Complexity Once and For All
My code ran perfectly on my laptop. Then we got 2 million users — here’s what broke, and the CS concept nobody explains properly until your server catches fire in production
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