$ sudo explain --topic anything
Tech concepts, explained until the doubt is gone.
An engineer's notebook on core concepts, system design, AI and the problems I hit along the way, written to clear the doubts that tripped me up.
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13 min read
Stale cache and cache stampede: why servers disagree
Why two servers give different answers, how to spot a stale cache, three ways to fix it, and how a cache stampede can follow.
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19 min read
Sessions, JWTs and load balancers explained
A beginner's walkthrough: what sessions and JWTs are, what breaks when you add a second server, how to diagnose it, and how to fix it.