100 requests per minute, and 200 got through
Where the simplest rate limiter leaks, and what real APIs use instead.
System DesignInterview questions12 min
How tech works inside.
Rate limiters, caches, queues and outages, drawn in pencil so you can watch them work.
I asked Claude its favorite food 100 times
Three Claude models, 100 answers each. Opus 5.5 picked ramen every single time.
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A 3-tier SaaS on AWS for $57 a month
Three tiers for a small SaaS, with the server in a public subnet to skip the NAT Gateway.
System Design9 min
What Vercel does after you git push
From an empty folder to a live API, and what every git push creates on Vercel.
Under the Hood7 min
Cache stampede
SoonA popular key expires and ten thousand requests hit the database in the same second.
System Design
You type a URL and press Enter
SoonEverything that happens before the first pixel shows up.
Under the Hood
The day Facebook left the internet
SoonOctober 2021, redrawn from Facebook's own postmortem.
Beautiful Data
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