100 requests per minute, and 200 got through
Where the simplest rate limiter leaks, and what real APIs use instead.
System DesignInterview questions12 min
System Design
How the parts of a backend behave once real traffic shows up: rate limiters, caches, queues, load balancers, replication.
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
Cache stampede
SoonA popular key expires and ten thousand requests hit the database in the same second.
System Design
Design a URL shortener
SoonThe classic warm-up question, and the follow-ups that make it hard.
Interview questionsSystem Design
Consistent hashing
SoonAdd one server to a cluster of ten and watch how many keys have to move.
System DesignInterview questions
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