Every timeout must be shorter than the one in front
The claim Most cascading outages are not caused by a component failing. They are caused by a component being slow while every timeout in the stack is longer than the one upstream o...
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Insights & tutorials
Engineering notes, infrastructure deep dives and practical guides from the Exotecho team.
A staging environment unlike production proves nothing
The claim Most staging environments differ from production in ways that guarantee they cannot catch the failures people expect them to catch: a smaller database, different configur...
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The rewrite will cost three times what you approved
The claim The estimate for a full rewrite is derived from the features you can see. The cost is driven by the features you cannot — the eleven years of edge cases, exceptions and q...
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Structured logs with a request ID, or none at all
The claim Free-text log lines without a correlation identifier are not diagnostic data. They are a diary. During an incident you cannot answer the only question that matters — what...
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Your domain registrar is your single point of failure
The claim Businesses spend real money on redundant servers, replicated databases and multi-region backups, then protect the domain name that points at all of it with a shared passw...
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Never send email from inside a web request
The claim Any call to a third-party service inside a request handler makes that service a hard dependency of your application. Sending mail synchronously means your order confirmat...
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One second of micro-caching absorbs a traffic spike
The claim Caching a dynamic page for one second sounds pointless. It is the single highest-leverage configuration change available to a small site, because it converts an unbounded...
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An SLA that promises response time promises nothing
The claim Nearly every IT support agreement in this market is written around response time. A one-hour response commitment is satisfied by an automated ticket acknowledgement. It o...
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Images, not JavaScript, are what your pages weigh
The claim On a typical content or commerce site, images account for the majority of transferred bytes — usually 55% to 75% — and the fix is a build step you configure once, not a f...
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