Whenever your backend fetches a URL that a user influenced — webhook targets, import-from-URL features, URL previews, PDF generators, RSS
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Mixture-of-Experts models dominate the frontier right now, and almost every explanation stops at the same level: “a router picks a
Continue readingInside MoE Routing: How the Gate Decides Which Experts See Your Token
Every latency dashboard has the same shape: a line for the average request duration and a line for p99, with
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Every relational database ships an isolation level selector, and most applications pick whatever the default is and move on. That
Continue readingSnapshot Isolation and Write Skew: What Your Database Actually Promises
The most expensive lie a system can tell is that it accepted work it cannot process in time. It usually
Continue readingBackpressure: What Your System Should Do When Consumers Fall Behind
Every language-level sync.Mutex rests on a guarantee the operating system makes for you: if a thread dies holding the lock,
Authentication has become a solved-enough problem that most teams barely think about it: OIDC, SSO, a middleware that verifies the
Continue readingBroken Access Control: The Vulnerability Class That Hides Behind Working Tests
Every so often a profiler hands you a paradox. Your server is running eight worker goroutines, the load is perfectly
Continue readingFalse Sharing: When Your Parallel Code Is Secretly Serial
The migration that works on staging and melts down production usually dies in the lock queue. Someone runs an ALTER
Continue readingZero-Downtime Schema Migrations: Expand-Contract on PostgreSQL, Step by Step
Ask a language model for JSON and most of the time it complies. Every so often it wraps the object
Continue readingConstrained Decoding: How LLMs Get Forced Into Valid JSON