Architecture stylesCost crossover
Off-season, a results portal costs $0.40 a month. When do containers win?
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More questions.
System design trade-offsSpeed and truth
Why do ad networks count every click twice, once fast and once right?
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Key technologiesHot keys
Your DynamoDB table has room to spare. Why does one key throttle?
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Common patternsBroadcast
A million fans, 2,000 comments a second. What do you actually send?
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InfrastructureZombies
You deleted a key. How can it come back from the dead?
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Social & feedsStories
Sixty friends posted Stories. How does the app know which you’ve seen?
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Real-time & collaborationPairing
Why not just pair the two players who’ve waited longest?
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E-commerce & bookingLive prices
200,000 people watch one price. Why not send them every bid?
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Data, analytics & monitoringNoisy neighbours
One crash-looping service logs 100× normal. Whose logs go stale?
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Core conceptsDependencies multiply
Four services, each 99.9% or better. Why is checkout worse than all of them?
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Networking and APIsFamous failure
Every hop’s checksum passed. Why were the files still corrupted?
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Data and storageRetention
Deleting a month of payments writes 90 GB. Dropping it writes kilobytes. Why?
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Messaging and streamsLittle’s law
Why did a slower database need eight times the workers?
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Distributed coordinationVersion vectors
The office adds tea; an offline rep adds rice. Whose edit wins?
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Running in productionBig bang
Why do big-bang rewrites “go down in flames most of the time”?
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Why is it slow? Performance anti-patternsNAT gateways
Every VM is under its limit. Why do connections fail at the NAT?
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Multi-tenant SaaSQuotas vs invoices
Enforce a quota from the billing ledger. How do 600,000 extra calls slip through?
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Architecture stylesBacklogs
Assume 500 orders a second. Rider assignment dies for 10 minutes. What breaks?
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System design trade-offsAmdahl
64 cores, so 64× faster? Why does a 5% lock cap you at 20×?
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Key technologiesSizing
Search traffic triples in an IPL innings break. Why add replicas an hour early?
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Common patternsStatic vs moving
Should restaurants and drivers live in the same index?
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InfrastructureClocks
Your server’s clock jumps back 25 ms. Which IDs get minted twice?
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Social & feedsSeen filter
You’ve watched 13,500 videos in 90 days. How does none come back?
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Real-time & collaborationScale
Why doesn’t adding Redis nodes speed up one big leaderboard?
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E-commerce & bookingBogus prices
Your parser says the TV now costs ₹499. Do you tell 200,000 people?
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Data, analytics & monitoringReplication slots
A stalled reader pins 108 GB an hour on the busiest database. Whose disk?
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